Reactions of metal dialkyl dithiophosphates part IV. The crystal structure of [Ag{S 2P(OEt) 2} 2] 22− a silver anion containing monodentate and tridentate dialkyl dithiophosphate groups

Abstract

The reaction between Ag{(S 2P(OEt) 2} and [Me 4N] [S 2P(OEt) 2] yields [Me 4N] [Ag{S 2P(OEt) 2} 2] ( 1), crystals of which are monoclinic, space group P2 1/ c, with a = 12.966(11), b = 16.159(14), c = 12.898(15) Å, β = 106.0(1)°, Z = 2; 2545 significant reflections were measured on a diffractometer and the structure was refined to R = 0.068 ( R w = 0.088). 1 contains the centrosymmetric species [Ag{S 2P(OEt) 2} 2] 2 2− in which two dialkyldithiophosphate ligands bridge the two metal centres while the other two dialkyldithiophosphate residues are monodenrate. The two sulphur atoms of the bridging dialkyldithiophosphate ligands bond very differently; thus while S(1) bridges two silver atoms [2.679(3) and 2.868(3) Å], S(2) is only bonded to one metal atom [2.728(3) Å]. Thus the ligands in the ring act simultaneously as bridging and chelating ligands. The four coordinate geometry around the metal is completed by S(3) [AgS(3) 2.517(3) Å] which is from the monodentate ligand.