Peculiarities of molecular structure of 1-vinylimidazole: High resolution NMR study

The peculiarities of molecular structure of 1-vinylimidazoles were studied using H-1 and C-13 NMR spectra of its complexes. Mechanisms of delocalization of unpaired electron spin density in the complex CoCl2- -4(1-vinylimidazole) were revealed. Characteristic features of 1-vinylimidazole coordination with (C2-H5)(3)SnCl were established. Unlike paramagnetic cobalt complex, the structure of VIM diamagnetic complex with triethylhalogenstananne R represents a trigonal bipyramid. The Sn atom in this complex has sp(3)d-hybridization and three alkyl moieties trend towards coplanarity interacting with sp(2)-orbitals of tin. The long-range spin-spin interaction between protons of 1-vinylimidazole and the vinyl group coupled with the pyrrole nitrogen N-1, typical for coplanar arrangement the imidazole cycle and vinyl moiety was found. (c) 2013 Published by Elsevier B.V.