Heterospinorganic molecules: nitrene-radical linkages

摘要

The cryogenic, matrix-isolated ESR and electronic spectroscopy of a set of quartet state organic phenylnitreno-radicals are described, using nitronylnitroxide, benzo-nitronylnitroxide, and verdazyl radical spinsites, and both meta and para connectivities. Delocalization of the nitrene unit in the para-linked series is not extensive, judging by the computational results. The ESR spectral results show that zero-field splitting is affected much more by the connectivity in the systems (para versus meta) than by structural variations within the nitreno-radical theme.