Crystal structure of bis(benzimidazolium) tetrabromocuprate(II) |
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Authors: | A Tosik M Bukowska-Strzy?ewska |
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Institution: | (1) Institute of General Chemistry, Technical University of ód , 90-924 ód , Poland |
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Abstract: | Stable, dark-violet crystals of (C7H7N2)2CuBr4 were obtained from an aqueous solution of CuBr2, HBr, and benzimidazole. The crystal structure was determined by three-dimensional X-ray analysis. The crystals are monoclinic:C2/c, a=15.651(4),b=7.945(1),c=15.775(4) Å, =91.44(2)°,Z=4,V
c=1960.96 Å3,D
x=2.105 g cm–3. The structure was refined by full-matrix least squares to giveR=0.042 andR
w=0.048 for 1254 intensities above 3 (I). The copper(II) ions are four-coordinated in the form of a distorted tetrahedron CuBr4 ofC
2 symmetry. Two different Cu-Br bond lengths are observed: Cu-Br(1)=2.426(2), Cu-Br(2)=2.330(2) Å. Only one flattened angle Br(2)-Cu-Br(2 )=132.71(9)°] in the CuBr4 tetrahedron is noted. The angles Br(1)-Cu-Br(1 )=108.83(7), Br(2)-Cu-Br(1 )=99.92(5) and Br(2)-Cu-Br(1)=107.13(5)° have been found. Hydrogen bonds explain the deformation of the CuBr
4
2–
coordination polyhedron. The structure is compared with other CuX
4
2–
complexes. |
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Keywords: | |
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