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- W2083002937 abstract "The iron chelates of polymethyl-substituted dipyrromethenes were prepared. The ferrous ion was found to form complexes having a ligand to metal ratio of 2 : 1 with 5,5′-substituted dipyrromethenes, 3,3′,5,5′-tetramethyl- and 3,3′,4,4′,5,5′-hexamethyl-dipyrromethene. On the other hand, the ferric ion gave a complex having a 3 : 1 molar ratio of ligand to metal with a 5,5′-unsubstituted ligand, 3,3′,4-trimethyldipyrromethene. The complexes were studied by means of visible and IR spectroscopy as well as by magnetic susceptibility measurements. The iron(II) chelates were confirmed to be of high spin type with distorted tetrahedral structure (D2), while the iron(III) chelate demonstrated a low spin character with hexacoordination. The strong ligand-field bands of the latter complex was ascribed to the trigonally distorted octahedral coordination (D3) along with a high covalent nature of metal-ligand bonds." @default.
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- W2083002937 date "1974-02-01" @default.
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- W2083002937 title "Transition-metal Complexes of Pyrrole Pigments. IX. Divalent and Trivalent Iron Chelates of Dipyrromethenes" @default.
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- W2083002937 doi "https://doi.org/10.1246/bcsj.47.458" @default.
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