Structure and properties characteristic of dimeric silver(I) complex:: Dinuclear bis(O,O′-diphenyldithiophosphato)bis(1,10-phenanthroline) Ag(I)

The complex bis(O,O'-diphenyldithiophosphato)bis(1,10-phenanthroline) silver(I), Ag-2[(Pho)(2)PS2](2)(Phen)(2), has been synthesized and structurally characterized. Its crystal structure has been determined by X-ray crystallography. It crystallizes in the monoclinic system, space group P2(1)/c, with unit cell parameters a = 11.140(2) Angstrom, b = 10.044(2) Angstrom, c = 23.006(6) Angstrom, beta = 113.36(3)degrees; V = 2363.1(9) Angstrom(3), rho(calcd) = 1.600g/cm(3), and Z = 4 for R-1 = 0.0961. The coordination geometry of each Ag atom, by two N atoms from 1,10-phenanthroline ligand and by two S atoms from two O,O'-diphenyldithiophosphate anions, is that of a tetrahedron. The two diphenyldithiophosphato ligands each bridge two silver atoms to form an eight-membered Ag2S4P2 ring, while the 1,10-phenanthroline molecule coordinates to a silver atom to complete the local tetrahedral geometry. The (AgAg)-Ag-... separation is 3.185(2) Angstrom. The data of elemental analysis, IR and UV-vis spectroscopies are in good agreement with the crystal structure. The thermal gravimetry data indicate that there are two decomposition steps with one intense endothermical peak and one weak exothermical peak. The final product of the thermal decomposition is AgS.