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

The asymmetric unit of bis(dicyclohexylammonium! bis(oxalatotriphenylstannate) [Cc: a = 14.669(4) Angstrom, b = 12.764(2) Angstrom, c = 32.198(9) Angstrom, beta = 95.14(1)degrees; Z = 4] consists of two [(cyclo-C6H11)(2)NH2](+) [(C6H5)(3)Sn(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 C(1) over bar symmetry, or as an occupancy modulation that keeps half the asymmetric units of a 1:1 disordered P2(1)/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 counter-ions are locally disordered.