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Titolo:
Crystal structures, magnetic and spectroscopic properties of manganese(II), cobalt(II), nickel(II) and zinc(II) dichloro complexes bearing two 2-pyridyl-substituted imino nitroxides
Autore:
Yamamoto, Y; Suzuki, T; Kaizaki, S;
Indirizzi:
Osaka Univ, Grad Sch Sci, Dept Chem, Toyonaka, Osaka 5600043, Japan Osaka Univ Toyonaka Osaka Japan 5600043 m, Toyonaka, Osaka 5600043, Japan
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
fascicolo: 10, , anno: 2001,
pagine: 1566 - 1572
SICI:
1472-7773(2001):10<1566:CSMASP>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
OPTICAL-ABSORPTION SPECTROSCOPY; SUBSTITUTED NITRONYL NITROXIDE; FERROMAGNETIC INTERACTIONS; FREE-RADICALS; METAL-IONS; TETRANUCLEAR COMPOUND; EXCHANGE INTERACTIONS; DERIVATIVES; LIGAND; BEHAVIOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Kaizaki, S Osaka Univ, Grad Sch Sci, Dept Chem, Toyonaka, Osaka 5600043, Japan Osaka Univ Toyonaka Osaka Japan 5600043 , Osaka 5600043, Japan
Citazione:
Y. Yamamoto et al., "Crystal structures, magnetic and spectroscopic properties of manganese(II), cobalt(II), nickel(II) and zinc(II) dichloro complexes bearing two 2-pyridyl-substituted imino nitroxides", J CHEM S DA, (10), 2001, pp. 1566-1572

Abstract

Four new complexes of formula [MCl2(IM2py)(2)], where M=Mn(II), Co(II), Ni(II) or Zn(II); IM2py=4,4,5,5-tetramethyl-2-(2-pyridyl)-imidazolin-1-oxyl, have been prepared, and examined from viewpoints of the crystal structures,magnetic and spectroscopic properties. All the complexes crystallize in anisomorphous space group C2/c with Z=4, and exist as discrete mononuclear molecules with OC-6-22 [cis(Cl)-trans(py)] geometrical structure in the crystal. In the zinc(II) complex a moderate intramolecular IM2py-IM2py antiferromagnetic interaction (2J'=-19.1(1) cm(-1)) is estimated by the magnetic susceptibility measurement. The magnetic interactions between Mn(II) and IM2py are found to be antiferromagnetic, J=-23.8(2) cm(-1). Ferromagnetic interactions of the complexes of Ni(II) and Co(II) are inferred from the magnetic susceptibility. These magnetic properties are substantiated by the variable temperature UV-vis-NIR spectra of which the intensities increase for Mn(II) or decrease for Ni(II) and Co(II) with decreasing temperature for the spin-forbidden d-d transition and/or the metal(II) d sigma to IM2py SOMO pi*CT transition.

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Documento generato il 25/01/20 alle ore 15:49:06