High-Spin Nitrenes with s-Triazine Skeleton
- 1 September 1999
- journal article
- research article
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals
- Vol. 334 (1), 157-166
- https://doi.org/10.1080/10587259908023313
Abstract
Heteroatomic high-spin molecules are suitable for a model study of room-temperature stable molecular based magnetics. We studied high-spin nitrenes (S = 1 and 2) with s-triazine skeleton, which were generated by the photolysis of the polyazide precursor. We identified mononitrene 1 (S = 1) and bisnitrene 2 (S = 2) for the first time by single-crystal ESR measurements. The fine-structure parameters were determined by the angular dependence of resonance fields. The determined fine-structure parameters were |D| = 1.402 cm−1 and |D| = 0.280 cm−1 for mononitrene 1 and bisnitrene 2, respectively. The large D values indicate that π-spin delocalization effects were hampered by introducing heteroatoms to π-spin systems. The hyperfine splittings due to the monovalent nitrogen nucleus of 1 were observed with magnetic field along the principal axis of the fine structure tensor. The hyperfine splitting constant was about 0.0018 cm−1. The temperature dependence of ESR signals showed that 1 and 2 were triplet and quintet in the ground state, respectively.Keywords
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