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

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 [Au-2(Tab)(2)(dppe)](2)(PF6)4 center dot 2MeOH (1 center dot 2MeOH), [Au-2(Tab)(2)(dppp)]Cl-2 center dot 0.5MeOH center dot 4H(2)O (2 center dot 0.5MeOH center dot 4H(2)O), and [Au-4(mu-Tab)(2)(Tab)(2)(dppb)](PF6)(4)center dot 4DMF (3 center dot 4DMF), respectively. Analogous reaction of 1 with dppb in DMF/C(2)H4Cl(2) produced one tetranuclear complex [Au-2(mu-Tab)(Tab)(2)](2)Cl4 center dot 2DMF center dot 4H(2)O(4 center dot 2DMF center dot 4H(2)O). Complexes 1-4 were characterized by elemental analysis, IR spectra, UV-vis spectra, H-1 and P-31{H-1} 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)(mu-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)(mu-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.