Thermochemical studies of three bis( O-alkyl- N-benzoylthiocarbamato)nickel(II) complexes

Abstract

The standard ( p ∘=0.1 MPa) molar enthalpies of formation of the crystalline complexes of Ni(II) with three N-benzoylthiocarbamic- O-alkylesters, PhCONHCSOR, R=Et, n-Bu, n-Hex were determined, at T=298.15 K, by high precision solution and reaction calorimetry. Complex − Δ f H m ∘( cr) /(kJ · mol −1) Ni(PhCONCSOEt) 2 619.2 ± 6.1 Ni(PhCONCSO- n-Bu) 2 707.4 ± 6.2 Ni(PhCONCSO- n-Hex) 2 802.6 ± 8.3 From the obtained results, the metal–ligand exchange enthalpies in the crystalline phase were derived, indicating that the increase of the ester-alkyl chain length in these compounds do not significantly affect the difference between the metal-to-ligand-binding enthalpy and the hydrogen-binding enthalpy, { D(M–L)− D(H–L)}.