A. Speca, F. J. Iaconianni, L. Gelfand
1979
Citations
0
Influential Citations
2
Citations
Journal
Journal of Inorganic and Nuclear Chemistry
Abstract
Abstract The bulky p -phenyl substituent in 4-phenylpyridine N-oxide(L) was shown to exert some steric influence during complex formation between this ligand and 3 d metal perchlorates. The steric hindrance introduced by L is not sufficiently severe as to impede the formation of [ML 6 ] n + cationic species. However, it is significant enough as to cause the stabilization of 4:1 or 5:1 complexes of L with M(ClO 4 ) n ( n = 2 or 3) in certain cases. These effects were best illustrated by the fact that, by variation of the synthetic conditions, three different solid Fe(ClO 4 ) 2 complexes with L were obtained, namely: [FeL 6 ](ClO 4 ) 2 and [FeL 5 (OClO 3 )](ClO 4 ). In the rest of the cases investigated, a single solid complex could be isolated with each metal perchlorate. These complexes are of the following types: [ML 6 ](ClO 4 ) 2 (MCo, Ni); [ML 5 (OClO 3 )](ClO 4 ) 2 (MCr, Fe); [ZnL 5 (OClO 3 )](ClO 4 ); [MnL 4 (OClO 3 )](ClO 4 ); and [CuL 4 ](ClO 4 ) 2 . The preceding formulations of the new metal complexes were based on spectral, magnetic and conductance studies.