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Preparation and crystal structure of polymeric ammonium silver(I) citrate hydrate, {NH4[Ag2(C6H5O7)(H2O)]}n

1993; Elsevier BV; Volume: 12; Issue: 6 Linguagem: Inglês

10.1016/s0277-5387(00)84988-8

1873-3719

Dalius S. Sagatys, Graham Smith, R.C. Bott, D.E. Lynch, Colin H. L. Kennard,

Lanthanide and Transition Metal Complexes

The polymeric silver(I) citrate complex {NH4[Ag2(C6H5O7)(H2O)]}n has been synthesized and its structure determined by X-ray diffraction methods and refined to R = 0.046 for 2520 observed reflections. This compound represents the first reported complexes of a silver(I) citrate. In the structural repeating unit there are two independent but different carboxylato(O,O′) bridged silver dimers [AgAg, 2.845, 2.846(1) Å] linked into infinite linear chains by the terminal carboxyl groups of the citrato(3 −) ligands. With one dimer, the AgO (axial) bonds are to oxygens from the sub-terminal carboxylate groups of two independent silver citrate chains. The second silver dimer also forms links with adjacent chains via axial AgO(carboxylate) bonds, while in the remaining axial sites are water molecules. The mean AgO distance is 2.377(4) Å. The result is a novel convoluted anionic chain sheet structure.