Reference

Positron lifetime diagnostics of b-diketonates of bivalent metals

All Rights Reserved. Positron lifetime diagnostics of b-diketonates of bivalent metals. Shapkin, N.In this study， 14024-81-8 and 14024-58-9 are also used. P.; Razov, V. I.; Tonkikh, I. V.; Svistunova, I. V.; Skobun, A. S.; Goncharova, K. A. (Far East State University, Vladivostok 690600, Russia). Russian Journal of Coordination Chemistry, 32(5), 359-363 (English) 2006 Pleiades Publishing, Inc. CODEN: RJCCEY. ISSN: 1070-3284. DOCUMENT TYPE: Journal CA Section: 65 (General Physical Chemistry) Section cross-reference(s): 68 Positron lifetime diagnostics was used to study manganese(II), cobalt(II), nickel(II), copper(II), and zinc(II) acetylacetonates, g-chloro and g-bromo chelate complexes of cobalt and nickel, and similar halo and nitro chelate complexes of copper. The dependences of the annihilation lifetime t2 on the metal nature and the stability const. of the metal chelate ring were established. The annihilation lifetime and intensity were found to depend not only on the electronic effect of the g-substituent in the chelate ring but also on the structure of the complex. A comparison of the dependences of the frequencies of the C-O and M-O stretching vibrations on t2 revealed that a positron interacts simultaneously with the g-carbon atoms and the O atoms of the chelate ring, whose accessibilities are detd. by the structures of bis(chelates). The plots of the ionization potentials of the n-orbitals of the bis(chelates) vs. t2 were similar to the plots of the quenching rate const. of the benzophenone triplet vs. t2 in the presence of the bis(chelates). .