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Photolysis of biphenyl‐3,4′ ‐diazide in a rigid glassy matrix at 77 K yields quintet state biphenyl‐3,4′ ‐dinitrene with zero‐field splitting parameters of | D / hc ‐ = 0.153 cm −1 and | E / hc | = 0.019 cm −1 determined by electron spin resonance spectroscopic studies. Curie plot studies are consistent with assigning the quintet to be the ground state in this species. This finding confirms qualitative connectivity‐based predictions for this general connectivity type of openshell system, and is in qualitative agreement with spectral INDO‐CI computational predictions for both planar and twisted geometries of the dinitrene.
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Minato et al. (1991) studied this question.
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