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- W1970012909 abstract "The 3-phenyl- and 3-benzyl-2, 4-pentanedione complexes of trivalent aluminum, chromium, iron and cobalt were prepared, and their electronic absorption spectra measured in the 220—900 mμ range. The spectral data were interpreted in detail in terms of the π3→π4, the electron transfer (dε→π4) and the d→d* transitions of the various components. In this series of complexes, an inter-ring π-interaction between a phenyl ring and a chelate ring is expected to remain to a limited extent in the metal complexes of 3-phenyl-2, 4-pentanedione, although the twist of both rings from the coplanarity is significant. For the aluminum complexes, π-electrons in the ligand part remain delocalized in a manner similar to that which holds in the corresponding enolate ion. On the other hand, each kind of π3→π4 transition in the transition metal complexes of the 2, 4-pentanedione derivatives was found to depend on the number of dε electrons of the central metal ion and to appear in this increasing order of energy: Cr<Fe<Co. In addition, the metal-ligand π-interaction has a major effect on the π3→π4 transition, and it seems to increase with respect to the ligands in the order: 2, 4-pentanedione, 3-phenyl-2, 4-pentanedione, and 3-benzyl-2, 4-pentanedione. The two major substituent (at the 3-position of 2, 4-pentanedione) effects which may affect the π3→π4 transitions were identified." @default.
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- W1970012909 date "1966-05-01" @default.
- W1970012909 modified "2023-09-24" @default.
- W1970012909 title "Electronic Spectra of Trivalent Metal Complexes of 3-Phenyl- and 3-Benzyl-2,4-pentanedione" @default.
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- W1970012909 doi "https://doi.org/10.1246/bcsj.39.901" @default.
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