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Effects of trivalent lanthanide complexes on the lifetimes of methylene-chain-linked biradicals in magnetic fields

✍ Scribed by Yoshifumi Tanimoto; Aiko Kita; Michiya Itoh; Masaharu Okazaki; Ryoichi Nakagaki; Saburo Nagakura

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 433 KB
Volume: 165
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(90)85426-d

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✦ Synopsis

Lanthanide g-diketonates and copper acetylacetonate in benzene quench the methylene-chain-linked triplet biradicals in the presence of magnetic fields. At 0.56 T, the quenching rate constant k, is in the order of IO8 M-' SK' for the former complexes and 4.7 x lo9 M-' s-' for the latter. Dipole-dipole interaction seems responsible for the quenching of the triplet biradical by the lanthanide complexes, while the Heisenberg exchange interaction is predominant in the quenching by the copper complex.

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