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Seik Weng Ng, A. David Rae

The pseudo symmetric structure of bis(dicyclohexylammonium) bis(oxalatotriphenylstannate)

The asymmetric unit of bis(dicyclohexylammonium) bis(oxalatotriphenylstannate) [Cc: a = 14.669(4) Å, b = 12.764(2) Å, c = 32.198(9) Å, β= 95.14(1)°, Z = 4] consists of two [(cyclo-C₆H₁₁)₂NH₂]⁺ / [(C₆H₅)₃Sn(O₂CCO₂)]^- ion-pairs that are linked by hydrogen bonds into a pseudo centrosymmetric dinuclear entity. The tin atoms in the stannates show cis-C₃SnO₂ trigonal bipyramidal coordination geometries. The structure can also be described either as two c-glide related substructures of pseudo C1 symmetry, or as an occupancy modulation that keeps half the asymmetric units of a 1: 1 disordered P2₁/c parent structure for which a´ = a/2, b´ = b/2 and c´ = c. The pseudo symmetry suggests a mechanism for stacking faults and twinning, which have been taken into consideration in refining the structure. The two dicyclohexylammonium counterions are locally disordered.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 215, 03/2000
Pages: 199

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