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2-Substituted m-Xylylene-Bridged Dicobaloximes:  Structure−Property Relationship Using Variable-Temperature 1H NMR Study

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posted on 29.08.2005, 00:00 by V. Vijaikanth, B. D. Gupta, Debaprasad Mandal, Shashank Shekhar
m-Xylylene-bridged dicobaloximes with a substituent at the 2-position having varying electronic and steric properties have been synthesized and characterized by 1H and 13C NMR spectroscopy. The variable-temperature 1H NMR study of these complexes shows that the electronic cis influence is an important phenomenon for the Co−C bond rotation. The coalescence temperature of the dioxime protons correlates well with the ortho substituent constant. The crystal structure of a 2-nitro-m-xylylene-bridged dicobaloxime, Py(dmgH)2Co-CH2-(2-NO2-1,3-C6H3)-CH2-Co(dmgH)2Py, is reported. The X-ray structural data support the 1H NMR findings.