Square planar nickel compounds with bulky thiols

Article abstract of DOI:10.1016/s0020-1693(97)05653-3

Details of the syntheses and the results of X-ray structural analyses of square planar Ni compounds with aliphatic thiolato-sulfur ligands, [Ni(dpmep)₂] (1) and [Ni(tpttd)] (2), where Hdmep and H₂tpttd are the abbreviations for2-(2,2-diphenyl-2-mercaptoethyl)pyridine and 2,2′,11,11′-tetraphenyl-1,5,8,12-tetrathiadodecane, respectively, are presented. Each of the thiolato-sulfur atoms of these compounds is sterically protected by two benzene rings at the a carbon position to suppress dimerization upon synthesis. 1·1.5CH₂Cl₂·MeCN crystallizes monoclinic P2₁/n with a=18.362(3), b=16.894(4), c=13.273(4) A?, β=104.59(2)°, V=3984(3) A?³ and Z=4. 2·1.5MeCN crystallizes triclinic P1? with a=15.091(6), b=15.661(3), c=14.085(7) A?, α=96.00(2), β=90.89(4), γ=99.70(2)°, V=3261(4) A?³and Z=4. The Ni-S and Ni-N bond lengths of 1 were compared with those of the nickel center in the A-cluster of carbon monoxide dehydrogenase.