Thermodynamics of metal-ligand bond formation. XXXI. Reaction of Bis(diphenyldithiophosphinato)nickel(II) with heterocyclic bases
VTP Anh, DP Graddon and VAK Ng
Australian Journal of Chemistry
31(11) 2417 - 2422
The low-spin, planar complex (Ph2PS2),Ni reacts with heterocyclic bases to form (Ph2PS2)2NiB and (Ph2PS2)2NiB2 (B = pyridine or 4-methylpyridine). Average thermodynamic data for adduct formation in chlorobenzene at 30°C are: with pyridine K1 500, K2 251. mol-1, ΔH1° -34, ΔH2° -44 kJ mol-1; with 4-methylpyridine K1 1000, K2 50, ΔH1° -35, ΔH2°-41. With 2- methyl-pyridine only the 1 : 1 adduct is formed, with K 13, ΔH° -34. In these systems the five-coordinate 1 : 1 adducts are unusually stable and are shown to have the high-spin configuration.
Full text doi:10.1071/CH9782417
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