New adducts of phthalocyaninatocobalt(II) with piperidine, 1-methylimidazole, 3,4-dimethylpyridine, 3,5-dimethylpyridine, 4-methylpyridine, 3-choloropyridine, pyrazine, 3-ethylpyridine, 4-ethylpyridine, 3-acetylpyridine, and 4-acetylpyridine have been synthesized. Strong σ-donor bases form bis adducts, while low σ ability favours the formation of mono adducts. All the bis adducts are low-spin species. Mono adducts may contain either low- or high-spin configurations. Apart from being favoured by the electronic properties of the base, the high-spin configuration is also favoured by steric hindrance and is probably accompanied by the exit of the cobalt atom out of the phthalocyaninato-plane. Electron spin resonance parameters provide evidence for the stabilization of the <sup>4</sup>E<inf>g</inf> state on passing from bis to mono adducts and for the removing of axial symmetry on passing from low-spin to high-spin mono adducts. It is suggested that the ground state of the high-spin mono adducts derives from the <sup>4</sup>E<inf>g</inf> state of the corresponding low-spin species.
Cariati, F., Micera, G., Zoroddu, M., Morazzoni, F. (1981). NEW ADDUCTS OF PHTHALOCYANINATOCOBALT(II) WITH BASE MOLECULES .3. CHEMICAL AND SPECTROSCOPIC RELATIONS BETWEEN MONO (LOW-SPIN AND HIGH-SPIN) AND BIS ADDUCTS. JOURNAL OF THE CHEMICAL SOCIETY DALTON TRANSACTIONS(2), 535-538 [10.1039/dt9810000535].
NEW ADDUCTS OF PHTHALOCYANINATOCOBALT(II) WITH BASE MOLECULES .3. CHEMICAL AND SPECTROSCOPIC RELATIONS BETWEEN MONO (LOW-SPIN AND HIGH-SPIN) AND BIS ADDUCTS
MORAZZONI, FRANCA
1981
Abstract
New adducts of phthalocyaninatocobalt(II) with piperidine, 1-methylimidazole, 3,4-dimethylpyridine, 3,5-dimethylpyridine, 4-methylpyridine, 3-choloropyridine, pyrazine, 3-ethylpyridine, 4-ethylpyridine, 3-acetylpyridine, and 4-acetylpyridine have been synthesized. Strong σ-donor bases form bis adducts, while low σ ability favours the formation of mono adducts. All the bis adducts are low-spin species. Mono adducts may contain either low- or high-spin configurations. Apart from being favoured by the electronic properties of the base, the high-spin configuration is also favoured by steric hindrance and is probably accompanied by the exit of the cobalt atom out of the phthalocyaninato-plane. Electron spin resonance parameters provide evidence for the stabilization of the 4EI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.