|
|
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result sql = Strontium selenogermanate(III) and barium selenogermanate(II,IV): synthesis, crystal structures, and chemical bonding
Strontium selenogermanate(III) and barium selenogermanate(II,IV): synthesis, crystal structures, and chemical bondingchar = T;code = 84
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result sql = The new selenogermanates Sr2Ge2Se5 and Ba2Ge2Se5 were synthesized by heating stoichiometric mixtures of binary selenides and the corresponding elements to 750 degrees C. The crystal structures were determined by single-crystal X-ray methods. Both compounds adopt previously unknown structure types. Sr2Ge2Se5 (P2(1)/n, a = 8.445(2) A, b = 12.302 A, c = 9.179 A, beta = 93.75(3) degrees, Z = 4) contains [Ge4Se10]8- ions with homonuclear Ge-Ge bonds (dGe-Ge = 2.432 A), which may be described as two ethane-like Se3Ge-GeSeSe2/2 fragments sharing two selenium atoms. Ba2Ge2Se5 (Pnma, a = 12.594(3) A, b = 9.174(2) A, c = 9.160(2) A, Z = 4) contains [Ge2Se5]4- anions built up by two edge-sharing GeSe4 tetrahedra, in which one terminal Se atom is replaced by a lone pair from the divalent germanium atom. The alkaline earth cations are arranged between the complex anions, each coordinated by eight or nine selenium atoms. Ba2Ge2Se5 is a mixed-valence compound with GeII and GeIV coexisting within the same anion. Sr2Ge2Se5 contains exclusively GeIII. These compounds possess electronic formulations that correspond to (Sr2+)2(Ge3+)2(Se2-)5 and (Ba2+)2- Ge2+Ge4+(Se2-)5. Calculations of the electron localization function (ELF) reveal clearly both the lone pair on GeII in Ba2Ge2Se5 and the covalent Ge-Ge bond in Sr2Ge2Se5. Analysis of the ELF topologies shows that the GeIII-Se and GeIV-Se covalent bonds are almost identical, whereas the GeII-Se interactions are weaker and more ionic in character.
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result sql = Strontium selenogermanate(III) and barium selenogermanate(II,IV): synthesis, crystal structures, and chemical bonding
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char = r;code = 114
char = e;code = 101
char = ;code = 32
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char = n;code = 110
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = i;code = 105
char = z;code = 122
char = e;code = 101
char = d;code = 100
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char = b;code = 98
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char = e;code = 101
char = a;code = 97
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char = n;code = 110
char = g;code = 103
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = o;code = 111
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char = c;code = 99
char = h;code = 104
char = i;code = 105
char = o;code = 111
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = c;code = 99
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char = m;code = 109
char = i;code = 105
char = x;code = 120
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = s;code = 115
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = r;code = 114
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char = s;code = 115
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = s;code = 115
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char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = r;code = 114
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char = s;code = 115
char = p;code = 112
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char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = o;code = 111
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char = 7;code = 55
char = 5;code = 53
char = 0;code = 48
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char = e;code = 101
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = s;code = 115
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char = C;code = 67
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = r;code = 114
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = s;code = 115
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char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
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char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = l;code = 108
char = e;code = 101
char = -;code = 45
char = c;code = 99
char = r;code = 114
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = X;code = 88
char = -;code = 45
char = r;code = 114
char = a;code = 97
char = y;code = 121
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char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = d;code = 100
char = s;code = 115
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char = ;code = 32
char = B;code = 66
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = d;code = 100
char = o;code = 111
char = p;code = 112
char = t;code = 116
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = i;code = 105
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = u;code = 117
char = n;code = 110
char = k;code = 107
char = n;code = 110
char = o;code = 111
char = w;code = 119
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = y;code = 121
char = p;code = 112
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = S;code = 83
char = r;code = 114
char = 2;code = 50
char = G;code = 71
char = e;code = 101
char = 2;code = 50
char = S;code = 83
char = e;code = 101
char = 5;code = 53
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = 2;code = 50
char = (;code = 40
char = 1;code = 49
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char = n;code = 110
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char = ;code = 32
char = a;code = 97
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 8;code = 56
char = .;code = 46
char = 4;code = 52
char = 4;code = 52
char = 5;code = 53
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char = 2;code = 50
char = );code = 41
char = ;code = 32
char = A;code = 65
char = ,;code = 44
char = ;code = 32
char = b;code = 98
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 1;code = 49
char = 2;code = 50
char = .;code = 46
char = 3;code = 51
char = 0;code = 48
char = 2;code = 50
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char = A;code = 65
char = ,;code = 44
char = ;code = 32
char = c;code = 99
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char = =;code = 61
char = ;code = 32
char = 9;code = 57
char = .;code = 46
char = 1;code = 49
char = 7;code = 55
char = 9;code = 57
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char = A;code = 65
char = ,;code = 44
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = a;code = 97
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char = =;code = 61
char = ;code = 32
char = 9;code = 57
char = 3;code = 51
char = .;code = 46
char = 7;code = 55
char = 5;code = 53
char = (;code = 40
char = 3;code = 51
char = );code = 41
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = Z;code = 90
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 4;code = 52
char = );code = 41
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = [;code = 91
char = G;code = 71
char = e;code = 101
char = 4;code = 52
char = S;code = 83
char = e;code = 101
char = 1;code = 49
char = 0;code = 48
char = ];code = 93
char = 8;code = 56
char = -;code = 45
char = ;code = 32
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
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char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = h;code = 104
char = o;code = 111
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = u;code = 117
char = c;code = 99
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = G;code = 71
char = e;code = 101
char = -;code = 45
char = G;code = 71
char = e;code = 101
char = ;code = 32
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = s;code = 115
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char = (;code = 40
char = d;code = 100
char = G;code = 71
char = e;code = 101
char = -;code = 45
char = G;code = 71
char = e;code = 101
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 2;code = 50
char = .;code = 46
char = 4;code = 52
char = 3;code = 51
char = 2;code = 50
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char = A;code = 65
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char = ,;code = 44
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char = w;code = 119
char = h;code = 104
char = i;code = 105
char = c;code = 99
char = h;code = 104
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char = m;code = 109
char = a;code = 97
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char = ;code = 32
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char = e;code = 101
char = s;code = 115
char = c;code = 99
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char = i;code = 105
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
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char = ;code = 32
char = t;code = 116
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char = o;code = 111
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char = e;code = 101
char = t;code = 116
char = h;code = 104
char = a;code = 97
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char = e;code = 101
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char = l;code = 108
char = i;code = 105
char = k;code = 107
char = e;code = 101
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char = S;code = 83
char = e;code = 101
char = 3;code = 51
char = G;code = 71
char = e;code = 101
char = -;code = 45
char = G;code = 71
char = e;code = 101
char = S;code = 83
char = e;code = 101
char = S;code = 83
char = e;code = 101
char = 2;code = 50
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char = 2;code = 50
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char = r;code = 114
char = a;code = 97
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char = m;code = 109
char = e;code = 101
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char = t;code = 116
char = s;code = 115
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char = s;code = 115
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = w;code = 119
char = o;code = 111
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char = s;code = 115
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = n;code = 110
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char = u;code = 117
char = m;code = 109
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char = a;code = 97
char = t;code = 116
char = o;code = 111
char = m;code = 109
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char = ;code = 32
char = B;code = 66
char = a;code = 97
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char = e;code = 101
char = 2;code = 50
char = S;code = 83
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char = 5;code = 53
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = n;code = 110
char = m;code = 109
char = a;code = 97
char = ,;code = 44
char = ;code = 32
char = a;code = 97
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char = =;code = 61
char = ;code = 32
char = 1;code = 49
char = 2;code = 50
char = .;code = 46
char = 5;code = 53
char = 9;code = 57
char = 4;code = 52
char = (;code = 40
char = 3;code = 51
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char = ;code = 32
char = A;code = 65
char = ,;code = 44
char = ;code = 32
char = b;code = 98
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char = =;code = 61
char = ;code = 32
char = 9;code = 57
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char = 1;code = 49
char = 7;code = 55
char = 4;code = 52
char = (;code = 40
char = 2;code = 50
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char = ;code = 32
char = A;code = 65
char = ,;code = 44
char = ;code = 32
char = c;code = 99
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char = =;code = 61
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char = 9;code = 57
char = .;code = 46
char = 1;code = 49
char = 6;code = 54
char = 0;code = 48
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = ;code = 32
char = A;code = 65
char = ,;code = 44
char = ;code = 32
char = Z;code = 90
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 4;code = 52
char = );code = 41
char = ;code = 32
char = c;code = 99
char = o;code = 111
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char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = s;code = 115
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char = [;code = 91
char = G;code = 71
char = e;code = 101
char = 2;code = 50
char = S;code = 83
char = e;code = 101
char = 5;code = 53
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char = 4;code = 52
char = -;code = 45
char = ;code = 32
char = a;code = 97
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char = i;code = 105
char = o;code = 111
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char = s;code = 115
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char = b;code = 98
char = u;code = 117
char = i;code = 105
char = l;code = 108
char = t;code = 116
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char = u;code = 117
char = p;code = 112
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char = b;code = 98
char = y;code = 121
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char = t;code = 116
char = w;code = 119
char = o;code = 111
char = ;code = 32
char = e;code = 101
char = d;code = 100
char = g;code = 103
char = e;code = 101
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char = s;code = 115
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = G;code = 71
char = e;code = 101
char = S;code = 83
char = e;code = 101
char = 4;code = 52
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = t;code = 116
char = r;code = 114
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char = h;code = 104
char = e;code = 101
char = d;code = 100
char = r;code = 114
char = a;code = 97
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char = w;code = 119
char = h;code = 104
char = i;code = 105
char = c;code = 99
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char = e;code = 101
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char = e;code = 101
char = r;code = 114
char = m;code = 109
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char = S;code = 83
char = e;code = 101
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char = a;code = 97
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char = o;code = 111
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char = s;code = 115
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char = p;code = 112
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char = a;code = 97
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char = e;code = 101
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char = a;code = 97
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char = f;code = 102
char = r;code = 114
char = o;code = 111
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char = h;code = 104
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char = a;code = 97
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char = u;code = 117
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char = a;code = 97
char = t;code = 116
char = o;code = 111
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char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = a;code = 97
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char = k;code = 107
char = a;code = 97
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char = e;code = 101
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char = a;code = 97
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char = c;code = 99
char = a;code = 97
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char = i;code = 105
char = o;code = 111
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char = s;code = 115
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char = a;code = 97
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char = r;code = 114
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char = g;code = 103
char = e;code = 101
char = d;code = 100
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char = b;code = 98
char = e;code = 101
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char = w;code = 119
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char = e;code = 101
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char = o;code = 111
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char = a;code = 97
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char = i;code = 105
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char = s;code = 115
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char = a;code = 97
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char = a;code = 97
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char = i;code = 105
char = g;code = 103
char = h;code = 104
char = t;code = 116
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char = r;code = 114
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char = i;code = 105
char = n;code = 110
char = e;code = 101
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char = s;code = 115
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = n;code = 110
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char = u;code = 117
char = m;code = 109
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = o;code = 111
char = m;code = 109
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = B;code = 66
char = a;code = 97
char = 2;code = 50
char = G;code = 71
char = e;code = 101
char = 2;code = 50
char = S;code = 83
char = e;code = 101
char = 5;code = 53
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char = i;code = 105
char = s;code = 115
char = ;code = 32
char = a;code = 97
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char = m;code = 109
char = i;code = 105
char = x;code = 120
char = e;code = 101
char = d;code = 100
char = -;code = 45
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = e;code = 101
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char = c;code = 99
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = G;code = 71
char = e;code = 101
char = I;code = 73
char = I;code = 73
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = G;code = 71
char = e;code = 101
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result sql = The new selenogermanates Sr2Ge2Se5 and Ba2Ge2Se5 were synthesized by heating stoichiometric mixtures of binary selenides and the corresponding elements to 750 degrees C. The crystal structures were determined by single-crystal X-ray methods. Both compounds adopt previously unknown structure types. Sr2Ge2Se5 (P2(1)/n, a = 8.445(2) A, b = 12.302 A, c = 9.179 A, beta = 93.75(3) degrees, Z = 4) contains [Ge4Se10]8- ions with homonuclear Ge-Ge bonds (dGe-Ge = 2.432 A), which may be described as two ethane-like Se3Ge-GeSeSe2/2 fragments sharing two selenium atoms. Ba2Ge2Se5 (Pnma, a = 12.594(3) A, b = 9.174(2) A, c = 9.160(2) A, Z = 4) contains [Ge2Se5]4- anions built up by two edge-sharing GeSe4 tetrahedra, in which one terminal Se atom is replaced by a lone pair from the divalent germanium atom. The alkaline earth cations are arranged between the complex anions, each coordinated by eight or nine selenium atoms. Ba2Ge2Se5 is a mixed-valence compound with GeII and GeIV coexisting within the same anion. Sr2Ge2Se5 contains exclusively GeIII. These compounds possess electronic formulations that correspond to (Sr2+)2(Ge3+)2(Se2-)5 and (Ba2+)2- Ge2+Ge4+(Se2-)5. Calculations of the electron localization function (ELF) reveal clearly both the lone pair on GeII in Ba2Ge2Se5 and the covalent Ge-Ge bond in Sr2Ge2Se5. Analysis of the ELF topologies shows that the GeIII-Se and GeIV-Se covalent bonds are almost identical, whereas the GeII-Se interactions are weaker and more ionic in character.
Publication: Chemistry 2000 Mar 17 ;6(6)::994-8.
Publication Date: 2000 Mar 17
Study Author(s): Johrendt, D;Tampier, M;
Institution: Institut fur Anorganische Chemie und Strukturchemie II, Heinrich-Heine-Universitat Dusseldorf, Germany. [email protected]
Shortcut link to this study:
Publication Date: 2000 Mar 17
Study Author(s): Johrendt, D;Tampier, M;
Institution: Institut fur Anorganische Chemie und Strukturchemie II, Heinrich-Heine-Universitat Dusseldorf, Germany. [email protected]
Shortcut link to this study:
The new selenogermanates Sr2Ge2Se5 and Ba2Ge2Se5 were synthesized by heating stoichiometric mixtures of binary selenides and the corresponding elements to 750 degrees C. The crystal structures were determined by single-crystal X-ray methods. Both compounds adopt previously unknown structure types. Sr2Ge2Se5 (P2(1)/n, a = 8.445(2) A, b = 12.302 A, c = 9.179 A, beta = 93.75(3) degrees, Z = 4) contains [Ge4Se10]8- ions with homonuclear Ge-Ge bonds (dGe-Ge = 2.432 A), which may be described as two ethane-like Se3Ge-GeSeSe2/2 fragments sharing two selenium atoms. Ba2Ge2Se5 (Pnma, a = 12.594(3) A, b = 9.174(2) A, c = 9.160(2) A, Z = 4) contains [Ge2Se5]4- anions built up by two edge-sharing GeSe4 tetrahedra, in which one terminal Se atom is replaced by a lone pair from the divalent germanium atom. The alkaline earth cations are arranged between the complex anions, each coordinated by eight or nine selenium atoms. Ba2Ge2Se5 is a mixed-valence compound with GeII and GeIV coexisting within the same anion. Sr2Ge2Se5 contains exclusively GeIII. These compounds possess electronic formulations that correspond to (Sr2+)2(Ge3+)2(Se2-)5 and (Ba2+)2- Ge2+Ge4+(Se2-)5. Calculations of the electron localization function (ELF) reveal clearly both the lone pair on GeII in Ba2Ge2Se5 and the covalent Ge-Ge bond in Sr2Ge2Se5. Analysis of the ELF topologies shows that the GeIII-Se and GeIV-Se covalent bonds are almost identical, whereas the GeII-Se interactions are weaker and more ionic in character.
PMID: 10785819
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