
TY  - JOUR
A1  - Livingstone, SE 
A1  - Wheelahan, B 
T1  - Complexes of 2,2'-bipyridyl and 1,10-phenanthroline with bivalent palladium and platinum having covalencies greater than four
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1964
VL  - 17
IS  - 2
SP  - 219
EP  - 229
KW  - 
UR  - https://doi.org/10.1071/CH9640219 
N2  - Conductimetric titrations of the perchlorates [Pd(chel)2](ClO4)2 (chel = 2,2'-bipyridyl or 1,10-phenanthroline) with X- ions (X = Cl, Br, I) in the solvents nitrobenzene and nitromethane give an end-point after the addition of one equivalent of halide ion, owing to the formation of the ions [Pd(chel)2X]+. Another endpoint is obtained after the addition of a second equivalent of halide ion. Spectral evidence suggests that in nitrobenzene the compound [Pd(bipy)2I2] (bipy = 2,2'- bipyridyl) is formed. In nitromethane the second end-point is regarded as due to the reaction [Pd(chel)2X]+ + X- &#8594; [Pd(chel)X2]+ chel.  The compound [Pt(bipy)2](ClO4)2 was prepared and titrated conductimetrically with halide ions in nitrobenzene and nitromethane. Only one end-point was obtained, indicating that the ions [Pt(bipy)2X]+, unlike the corresponding palladium complexes, are stable in the presence of excess halide ion. It is assumed that in all these monohalogeno-complex ions the metal atom is sexicovalent, due to the coordination of one molecule of solvent. Evidence is presented for the occurrence of six-coordinated platinum(II) in the compounds [Pt(bipy)2I(H2O)]I.H2O, [Pt(bipy)zI(H2O)](ClO4)2.H2O, and [Pt(bipy)2I2]. 
ER  -

