Abstract
Palladium clusters Pd4(SEt)4(OAc)4(I) and Pd6(SEt)12(II) were synthesized and studied. Their structure was determined by X-ray diffraction analysis. For I, a= 9.774(2) A, b= 10.821(2) A, c= 13.061(3) A, β = 92.88(3)°, V= 1379.6(5) A3, ρ(calcd.) = 2.182 g/cm3, space group P21/n, Z= 4, Nref= 1558, and R= 0.031; for II, a= 10.581(1) A, b= 10.584(2) A, c= 11.478(2) A, α = 101.62(1)°, β = 104.95(1)°, γ = 106.74(1)°, V= 1135.2(4) A3, ρ(calcd) = 2.007 g/cm3, space group P1, Z= 1, Nref= 2828, and R= 0.022. In cluster I, four Pd atoms form a planar cycle. The neighboring palladium atoms are bound by two acetate or by two mercaptide bridges, the Pd···Pd distances being 3.036–3.195 A. In cluster II, Pd atoms form a planar six-membered cycle with Pd···Pd distances of 3.083–3.127 A. The neighboring palladium atoms are bound by two mercaptide bridges. The formation of analogous clusters in solution was confirmed by IR spectroscopy.
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