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Studies on the synthesis and magnetic property of binuclear oxovanadium(IV) complexes bridged by chloranilato group
Author(s) -
YanTuan Li,
CuiWei Yan,
DaiZheng Liao
Publication year - 1998
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19980160204
Subject(s) - chemistry , group (periodic table) , property (philosophy) , crystallography , polymer chemistry , stereochemistry , organic chemistry , epistemology , philosophy
Abstract Six novel oxovanadium(IV) binuclear complexes have been synthesized and characterized, namely, [(VO) 2 (CA)L 2 ]SO 4 [L denotes 5‐methyl‐1,10‐phenanthroline (Me‐phen); 2,9‐dimethyl‐1,10‐phenanthroline (Me 2 ‐phen); 5‐chloro‐1,10‐phenanthroline (Cl‐phen); diaminoethane (en); 1,3‐diaminopropane (pn) and 1,2‐diaminopropane (ap) respectively.], where CA represents the dianion of chloranilic acid. Based on elemental analyses, molar conductivity and room temperature magnetic moment measurements, IR and electronic spectral studies, it is proposed that there complexes have CA‐bridged structures and consist of two vanadium(IV) ions in a square‐pyramidal environment. The complexes [(VO) 2 (CA)(Me‐phen) 2 ]SO 4 (1) and [(VO) 2 (CA)(Me 2 ‐phen) 2 ]SO 4 (2) were characterized by variable temperature magnetic susceptibility measurements (4∼300 K) and the observed data were fitted to the modified Bleaney‐Bowers equation by the least‐squares method, giving the exchange integral J =‐15.8 cm −1 for 1 and J =‐10.6 cm −l for 2. This result indicates that there is a weak antiferromagnetic spin‐exchange interaction between the two VO 2+ ions within each molecule.