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New feature of the phosphorescence of copper complexes ofmeso-tetraarylporphyrins

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Abstract

Introduction of methyl groups in orthopositions of phenyl rings of a Cu-meso-tetraphenylporphin (Cu-TPhP) molecule is shown to lead to a substantial decrease in the diffusivity of the spectrum of low-temperature (77 K) phosphorescence. It is found that the long-lived (580 μsec) and short-lived (0.7 μsec) components of Cu-TPhP phosphorescence differ in emission and absorption (phosphorescence-excitation) spectra and belong to two forms of molecules. The phosphorescence spectrum of the predominant form with small τp is diffuse, while its absorption spectrum is shifted slightly in a bathochromic manner. The phosphorescence spectrum with large τp is structural and is similar to the spectrum of Cu-meso-tetrakis-(ortho-tolyl)porphin. The difference is attributed to the nonplanarity (saddle distortion) of a Cu-TPhP molecule in the lower triplet state in the case of the form with small τp.

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Authors
  1. K. N. Solov'ev
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  2. V. N. Knyukshto
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  3. G. D. Egorova
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Additional information

Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072, Belarus; e-mail: llum@imaph.bas-net.by. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 6, pp. 743–747, November–December, 1999.

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Solov'ev, K.N., Knyukshto, V.N. & Egorova, G.D. New feature of the phosphorescence of copper complexes ofmeso-tetraarylporphyrins. J Appl Spectrosc 66, 855–860 (1999). https://doi.org/10.1007/BF02675187

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  • DOI: https://doi.org/10.1007/BF02675187

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