Binuclear complexes with ligands based on the 2,6-bis(diphenylphosphinomethyl)benzene framework. Syntheses and crystal structures of [Ir2Cl2(µ-CO){2,6-(Ph2PCH2)2C6H3S}2]·2CH2Cl2, [Ni2{2,6-(Ph2PCH2)2C6H4S}2][PF6]2·Et2O·0.5CH2Cl2 and [Rh2Cl2(CO)2{1,3-(Ph2PCH2)2C6H4}2]
Abstract
The new binucleating phosphinothiolate proligand 2,6-(Ph2PCH2)C6H4SH (L3H) was prepared from bromo-2,6-dimethylbenzene in a 4 step synthesis. Reaction with [IrCl(CO)(PPh3)2] in MeCN gave the carbonyl and thiolate bridged dimer [Ir2Cl2(µ-CO)(L3)2]1. Reaction of [{RhCl(CO)2}2] with half an equivalent of L3H resulted in formation of the dimeric species [Rh2Cl(CO)2(L3)]2 with one bridging thiolate and one bridging chloride. The dimeric species [Ni2(L3)2]2+3 was formed in high yield from reaction of [NiCl2(PPh3)2] with L3H in MeCN. The diphosphine 1,3-(Ph2PCH2)2C6H4 (L4) gave the dimeric species [Rh2Cl2(CO)2(L4)2] 4 with [RhCl(CO)(PPh3)2] with no evidence for metallation at the bridging aryl group. The crystal structures of complexes 1, 3 and 4 are discussed.
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