PROTODEMETALLATION REACTIONS OF SOME DIPHENYLTHALLIUM(III) COMPOUNDS WITH DICYCLOHEXYLDITHIOPHOSPHINIC ACID - CRYSTAL AND MOLECULAR-STRUCTURES OF [TLPH(2)(S2P(C6H11)(2))], [TLPH(S2P(C6H11)(2))(2)] AND [TL(S2P(C6H11)(2))(3)]CENTER-DOT-CHCL3

The treatment of diphenylthallium(III) compounds TIPh(2)X [X = Br, OH or S2P(C6H11)(2)] with dicyclohexyldithiophosphinic acid, HS(S)P(C6H11 )(2), led to 'protodemetallation' i.e. loss of one or more phenyl grou ps from thallium, with formation of benzene formation of [TiPh{S2P(C6H 11)(2)}(2)] and [Tl{S2P(C6H11)(2)}(3)]. CHCl3. The crystal structures of these compounds and that of [TlPh(2){P-2(C6H11)(2)}(2)] were solved by X-ray diffraction, which indicated that they all crystallize in th e triclinic space group P (1) over bar with Z = 2. For [TlPh(2){S2P(C6 H11)(2)}] a = 10.141(1), b = 10.315(2) and c = 11.913(2) Angstrom, alp ha = 94.46(1), beta = 101.45(1) and gamma = 91.01(1)degrees; the thall ium atom is co-ordinated to one carbon atom of each phenyl and to both sulfur atoms of a dicyclohexyldithiophosphinate ligand [S2P(C6H11)(2) ], and weakly interacts with two neighbouring ligands. For [TlPh{S2P(C 6H11)(2)}(2)] a = 9.442(1), b = 10.809(2) and c = 18.256(2) Angstrom, alpha = 80.41(1), beta = 86.95(1) and gamma = 72.52(1)degrees; the tha llium atom is co-ordinated to a phenyl carbon atom and to both sulfur atoms of each anisobidentate S2P(C6H11)(2) ligand. For [Tl{S2P(C6H11)( 2)}(3)] (which incorporates a chloroform solvent molecule) a = 15.539( 1), b = 16.23(3) and c = 10.556(1) Angstrom, alpha = 103.13(1), beta = 91.71(1) and gamma = 111.56(2)degrees; the thallium atom is co-ordina ted to three pairs of sulfur atoms from two very anisobidentate ligand s and one practically isobidentate dithiophosphinate. The IR, Raman, a nd H-1, C-13, P-31 and Tl-205 NMR spectra of the compounds have also b een recorded and analysed.