
TY  - JOUR
A1  - Ang, L 
A1  - Graddon, DP 
A1  - Ng, VAK 
T1  - Thermodynamics of metal-ligand bond formation. XXV. Addition of bases to Bis[O,O'-diethyl thiomalonato]nickel(II) in various solvents
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1977
VL  - 30
IS  - 3
SP  - 495
EP  - 501
KW  - 
UR  - https://doi.org/10.1071/CH9770495 
N2  - Thermodynamic data have been obtained from spectroscopic and calorimetric measurements for the addition of pyridine and 4- methylpyridine to bis(O,O?-diethyl thiomalonato)nickel(II), Ni(etm)2, in solution in cyclohexane, benzene, 1,2-dichloroethane, acetonitrile, butan-2-one and carbon tetra-chloride. In each solvent two base molecules add successively, giving Ni(etm)2B then Ni(etm)2B2. There are only small variations in K1 and K2 in different solvents; typically K1 &#8776; 200, K2 &#8776; 100 l. mol-1, &#916;H°1+2 &#8776; -65, &#916;H°2 &#8776; 0 kJ mol-1 at 30°C, but in benzene and cyclohexane &#916;H°2 &#8776; -25 and in cyclohexane &#916;H°1+2 &#8776; -100 kJ mol-1. The main driving force for adduct formation is apparently the formation of the first Ni-N bond, which is accompanied by a spin change. 
ER  -

