Reactions of a gold(i) thiolate complex [Au(Tab)2]2(PF6)2 (Tab = 4-(trimethylammonio)benzenethiolate) with diphosphine ligands?

Dalton Transactions Pub Date: 2010-11-30 DOI: 10.1039/C0DT00620C

Abstract

Reactions of a gold(I) thiolate complex [Au(Tab)2]2(PF6)2 (Tab = 4-(trimethylammonio)benzenethiolate) with equimolar 1,2-bis(diphenylphosphine)ethane (dppe), 1,3-bis-(diphenylphosphine)propane (dppp) or 1,4-bis-(diphenylphosphine)butane (dppb) in MeOH–DMF–CH2Cl2 gave rise to three polymeric complexes [Au2(Tab)2(dppe)]2(PF6)4·2MeOH (1·2MeOH), [Au2(Tab)2(dppp)]Cl2·0.5MeOH·4H2O (2·0.5MeOH·4H2O), and [Au4(μ-Tab)2(Tab)2(dppb)](PF6)4·4DMF (3·4DMF), respectively. Analogous reaction of 1 with dppb in DMF/C2H4Cl2 produced one tetranuclear complex [Au2(μ-Tab)(Tab)2]2Cl4·2DMF·4H2O (4·2DMF·4H2O). Complexes 1–4 were characterized by elemental analysis, IR spectra, UV-vis spectra, 1H and 31P{1H} NMR and single crystal X-ray analysis. Compounds 1 and 2 consist of [Au(Tab)]2 dimeric fragments that are bridged by dppe or dppp ligands to form a 1D linear chain extending along the a axis. For 3, each [Au4(Tab)2(μ-Tab)2] fragment is linked by a pair of dppb ligands to afford another 1D chain extending along the c axis. For 4, the four [Au(Tab)]+ fragments are linked by two Au–Au bonds and two doubly bridging Tab ligands to form a {[Au(Tab)]4(μ-Tab)2} chair-like cyclohexane structure. Hydrogen-bonding interactions in 2 and 4 lead to the formation of interesting 2D hydrogen-bonded networks. The luminescent properties of 1–4 in solid state were also investigated.

Graphical abstract: Reactions of a gold(i) thiolate complex [Au(Tab)2]2(PF6)2 (Tab = 4-(trimethylammonio)benzenethiolate) with diphosphine ligands
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