Role of metal center in reactions of polynuclear nickel(ii) and cobalt(ii) trimethylacetates with 8-amino-2,4-dimethylquinoline.

Autor: Pakhmutova, E., Malkov, A., Mikhailova, T., Fomina, I., Sidorov, A., Aleksandrov, G., Golovaneva, I., Novotortsev, V., Ikorskii, V., Nefedov, S., Eremenko, I.
Zdroj: Russian Chemical Bulletin; Jan2003, Vol. 52 Issue 1, p139-149, 11p
Abstrakt: The reactions of 8-amino-2,4-dimethylquinoline (L) ( 1) with polynuclear nickel(ii) and cobalt(ii) hydroxotrimethylacetato complexes under anaerobic conditions were studied. The nonanuclear cluster Ni9(μ4-OH)3(μ3-OH)3(μn-OOCCMe3)12(HOOCCMe3)4 gave the mononuclear complex Ni(η2-L)(η2-OOCCMe3)2 ( 2). The tetranuclear complex Ni4(μ3-OH)2(μ-OOCCMe3)4(η2-OOCCMe3)2(EtOH)6 produced the mononuclear complex Ni(η2-L)(η2-OOCCMe3)(OOCCMe3)L ( 3). At room temperature, the cobalt-containing polynuclear trimethylacetates, viz., the polymer [Co(OH) n(OOCCMe3)2– n] x and the tetranuclear complex Co4(μ3-OH)2(μ-OOCCMe3)4(η2-OOCCMe3)2(EtOH)6, were transformed into the trinuclear cobalt(ii) complex Co3(μ3-OH)(μ-OOCCMe3)4(η2-L)2(OOCCMe3) ( 4). Meanwhile, at 80 °C these compounds generated the binuclear cobalt(iii) complex Co2(μ2η2-(HN)C9NMe2)2(μ-OOCCMe3)(L)(OOCCMe3)3 ( 5). The structures of the resulting compounds were established by X-ray diffraction analysis. Compounds 2— 4 exhibit the antiferromagnetic spin-spin exchange coupling, whereas compound 5 is diamagnetic. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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