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.

New adducts of phthalocyaninatocobalt(II) with base molecules. Part 3. Chemical and spectroscopic relations between mono (low- and high-spin) and bis adducts / Cariati, Franco; Micera, Giovanni; Zoroddu, Maria Antonietta; Morazzoni, Franca. - In: JOURNAL OF THE CHEMICAL SOCIETY DALTON TRANSACTIONS. - ISSN 0300-9246. - 2(1981), pp. 535-538. [10.1039/DT9810000535]

New adducts of phthalocyaninatocobalt(II) with base molecules. Part 3. Chemical and spectroscopic relations between mono (low- and high-spin) and bis adducts

MICERA, Giovanni;ZORODDU, Maria Antonietta;
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 4Eg 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 4Eg state of the corresponding low-spin species.
New adducts of phthalocyaninatocobalt(II) with base molecules. Part 3. Chemical and spectroscopic relations between mono (low- and high-spin) and bis adducts / Cariati, Franco; Micera, Giovanni; Zoroddu, Maria Antonietta; Morazzoni, Franca. - In: JOURNAL OF THE CHEMICAL SOCIETY DALTON TRANSACTIONS. - ISSN 0300-9246. - 2(1981), pp. 535-538. [10.1039/DT9810000535]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11388/166782
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