
TY  - JOUR
A1  - Graddon, DP 
A1  - Siddiqi, IA 
T1  - Thermodynamics of metal-ligand bond formation. XXI. Base adducts of nickel(II) glyoximato complexes
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1976
VL  - 29
IS  - 6
SP  - 1201
EP  - 1207
KW  - 
UR  - https://doi.org/10.1071/CH9761201 
N2  - Bis(glyoximato)nicke1(11) complexes and their BF2-bridged derivatives react with Lewis bases in non-donor solvents forming low-spin 1 : 1 adducts. Thermodynamic data are reported for formation of adducts of glyoximato complexes with PBu3 and of BF2-bridged complexes with pyridine (py), 4-methylpyridine (mpy), piperidine (pip), tributylphosphine, triphenylphosphine, ethane-1,2-diyi- bis(diphenylphosphine) and tetrahydrothiophen. Adduct stability is increased by BF2-bridging; in the Pbu3 adducts this is due to entropy factors. Variation of alkyl groups in the glyoxinie has only a small effect, but replacement of alkyl by Ph or H increases adduct stability while lowering enthalpy of adduct formation. Average values of &#916;Hº and K (at 30ºC) for adducts of BF2-bridged complexes and for PBu3 adducts of H-bridged complexes (last entry) are:     PY  mpy  pip  PPh3 PBu3 Pbu3  -&#916;Hº (kJ mol-l)  29   31  35   23  43   42  K (1.mol-1)    3   5   80   4   800  60 
ER  -

