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Electron spin relaxation rates for nitridochromium(V) tetratolylporphyrin and nitridochromium(V) octaethylporphyrin in Frozen solution

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Abstract

T1 andTm for nitridochromium(V) tetratolylporphyrin and nitridochromium(V) octaethylporphyrin were measured by saturation recovery and electron spin echo EPR, respectively, between 10 and 130 K. The temperature dependence of 1/T1 was similar to that observed previously for chromium(V) complexes of hydroxycarboxylic acids. The spin lattice relaxation rate was faster in the perpendicular plane (the porphyrin plane) than normal to this plane. 1/Tm was orientation dependent with the fastest rates observed for orientations intermediate between the principal axes. The orientation dependence of 1/Tm increased with increasing temperature and decreasing rigidity of the matrix, and is attributed to molecular motion.

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Authors and Affiliations

  1. Department of Chemistry, University of Denver, 80208, Denver, Colorado, USA

    R. Konda, J. -L. Du, S. S. Eaton & G. R. Eaton

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  1. R. Konda
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  2. J. -L. Du
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  3. S. S. Eaton
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  4. G. R. Eaton
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Konda, R., Du, J.L., Eaton, S.S. et al. Electron spin relaxation rates for nitridochromium(V) tetratolylporphyrin and nitridochromium(V) octaethylporphyrin in Frozen solution. Appl. Magn. Reson. 7, 185–193 (1994). https://doi.org/10.1007/BF03162611

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  • DOI: https://doi.org/10.1007/BF03162611

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