Abstract

The diradical methylenebis(1,5-diisopropyl-6-oxoverdazyl) was synthesized by benzoquinone oxidation of the corresponding bis(tetrazane). The diradical crystallizes in the monoclinic space group C2/c with cell parameters a = 21.1411(8) A, b = 12.4781(5) A, c = 8.2457(3) A, beta = 108.638(2) degrees, V = 2061.15 A3, Z = 4. Magnetic measurements indicate the diradical has a singlet ground state and triplet excited state at 150 cm(-1). Interaction between the nonconjugated radical centers is also seen in the UV-vis spectrum as a broad shoulder near 500 nm that is not apparent in the spectrum of the monoradical.

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