1969 Volume 42 Issue 10 Pages 2858-2862
Square, planar bis(acetylacetone)-, and bis(benzoylacetone)-etylenediimine-Co(II) chelates with a low-spin d7 electron structure yield nitrosyl complexes with the chelate : NO molar ratio of 1 : 1. On the basis of the IR spectra and the NMR spectra, and on the basis of molecular-weight determinations, these nitrosyls have been considered as being penta-coordinate cobalt complexes with square-pyramidal configuration. The nitrosyls are diamagnetic, indicating an electron-pairing bond between the central Co(II) and the NO molecule. The NO groups in these nitrosyls have been postulated to be predominantly neutral. In the electronic spectra, these penta-coordinate, diamagnetic Co(II) complexes show a characteristic absorption band at 18–20×103 cm−1 with logε\doteqdot3.
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