<報文>付加反応のNMR法による研究(第4報) : Co(DMP)_2アミンN-オキサイド付加体および付加体中のエチルプロトンのNMR

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  • Co DMP 2 アミン N-オキサイド フカタイ オヨビ フカタイ チュウ ノ エチル プロトン ノ NMR
  • <Original Papers>Nuclear Magnetic Resonance Studies on Adduct Formation (IV) : NMR Behaviors of Amine N-Oxide Adducts and of Paramagnetic Ethyl Protons in Sulfur Ligand

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Pyridine N-Oxide and its monomethyl derivatives were found to form 1 : 2 adducts with bis (diethylthiophosphato) cobalt (II) complex, Co(DMP)_2 and electron spin density distribution in these ligands was studied by NMR. The unpaired electrons of cobalt atom were observed to transfer via π bonding from cobalt (II) to oxygen atom of amine N-oxides. Existence of some steric hindrance in α-picoline N-oxide adducts was estimated from the individual behaviros of β-protons of the amine. In addition to these results, NMR spectra of sulfur ligand protons of cobalt complexes were obtained only in pyridine-CDCl_3 solutions, and from the intensity of the absorption, the resonance protons were found to be methyl protons of ethyl groups in Co(DMP)_2.

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