Tellurium complexes with new, large-bite dithio ligands. The crystal structures of cis- and trans- [Te{Ph2P(S)NP(S)(OPh)2}2] and [(4-MeOC6H4TeCl3)2{μ-iPr2P(S)FcP(S)iPr2}]

摘要: Reaction of the protonated large-bite bidentate ligand Ph2P(S)-NH-P(S)(OPh)(2) with [Te{NH2)(2)CS}(4)]Cl-2 resulted in the complex [Te(L-L)(2)] (1a), where (L-L)(-) = Ph2P(S)-N-P(S)(OPh)(2). When reacted with 4-MeOC6H4TeCl3, an isomeric complex, 1b. resulted. Reaction between less basic ligand 'Pr2P(S)-Fc-P(S)'Pr-2 (Fc = ferrocene) and 4-MeOC6H4TeCl3 yielded complex [(4-MeOC6H4TeCl3)(2) {mu-'Pr2P(S)-Fc-P(S)'Pr-2}], (2). X-ray crystallographic studies show that 1a 1b both are square planar complexes Te(II), being asymmetric 'cis' with two short Te-S bonds trans to two long (average bond lengths 2.5415 2.9050 Angstrom). Isomer Ib is centrosymmetric, 'trans', nearly equal bond lengths averaging 2.6805 Angstrom. Complex 2 is addition compound where large dithio bridges units through weak bonds. The resulting coordination around each Te(IV) atom psi -octahedral lone pair electrons and aryl in axial positions relative TeCl3S equatorial plane. Here lengths 2.7560(16) 2.6910(12) Angstrom. influence is smaller than Cl-, average Te-Cl bond length sulfur only 2.4196 Angstrom, while other Te-Cl 2.4959 reason for the lower nature a P-Fc-P backbone compared those PN-P backbones, it lacks a central charge donating group like N-.