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Time-resolved and conventional ESR studies of the excited triplet states of dibenzotetraazamacrocyclic complexes of Al(III) and Ge(IV)

✍ Scribed by Shozo Tero-Kubota; Hiroki Oshio; Tasuku Ito; Virgil L. Goedken; Jiro Higuchi

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 409 KB
Volume: 131
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)87180-9

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✦ Synopsis

ESR spectra of the lowest excited tnplet states of AI(C22H22N4)Et and Ge(ClsHi4N,)C12 complexes were measured in glassy matrices at 77 K. Time-resolved ESR spectra showed that the highest TX sublevel of the Al complex is predominantly populated, while the TX and Tr sublevels of the Ge complex are initially populated by intersystem crossing (ISC), the X axis being parallel to the long axis of the hgand and the Y axis in the ligand plane. Theoretical calculations indicate that about 70% of the unpaired spins are located in the six-membered chelate (two trimethine bridge) ring(s) and the nitrogens in the T, state of the complexes.

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