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- W2023778144 abstract "Studies were carried out on methylene chloride solutions of cobalt(II) complexes with the following β-diketones: acetylacetone, benzoylacetone, dibenzoylmethane, trifluoroacetylacetone, benzoyltrifluoroacetone. Spectrophotometric and molar weight measurements show that all these complexes are polymerized in concentrated solutions and in the solid state. The degradation through dilution is more important than for the analogous nickel(II) compounds. The substituents on the β-diketone have little influence. These measurements show also that, while cobalt acetylacetonate is tetrameric, cobalt benzoylacetonate is probably trimeric. Nous avons étudié le comportement, en solution dans le chlorure de methylène, des complexes formés par le cobalt(II) avec les β-dicétones: acétylacétone, benzoylacétone, dibenzoylméthane, trifluoracétylacétone, benzoyltrifluoracétone. L'étude par spectrophotométrie dans le visible et les mesures de masses molaires montrent que, en solution concentrée et à l'état solide, tous ces complexes sont polymerises. La dégradation de la forme à degré d'association maximal sous l'effet de la dilution est plus important que pour les β-dict́onates de nickel(II) correspondants et n'est que peu influencée par la nature des substituants sur 1a β-dicétone. Alors que l'acétylacétonate de cobalt(II) est tétramère à l'état solide, le benzoylacétonate serait trimère." @default.
- W2023778144 created "2016-06-24" @default.
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- W2023778144 date "1972-08-01" @default.
- W2023778144 modified "2023-09-24" @default.
- W2023778144 title "Différences de structure entre quelques β-dicétonates de cobalt(ii)" @default.
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- W2023778144 doi "https://doi.org/10.1016/0022-2860(72)87017-0" @default.
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