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- W2032003173 abstract "The pH dependent rate profiles were measured for the formation of pyridoxylidinealanatoaluminum(III) complex by following the 370 nm electronic transition absorption assigned to the π1 band of the pyridine ring of the Schiff's base. These rate profiles were further resolved in terms of optically active species by circular dichroism (CD) measurements which revealed the presence of a previously unidentified dimeric chelate: pyridoxylidinealanatoaluminum(III)-μ-dihydroxopyridoxylidinealanatoaluminum(III). This binuclear complex is characterized by an extraordinarily enhanced negative rotation. Thus, for example, at pH 8 for a 10−3 M solution of Al(III) and pyridoxal at 25° with ionic strength 1.00, the curve-resolved electronic spectrum at λ = 295 nm and 336 nm has optical densities of only 0.074 and 0.047 units, respectively, indicating their presence as only ~10% of the total Schiff's bases. The corresponding CD components show strong negative rotations (θ) of −33.5 and −31.3 m°, respectively. The intrinsic rotation of the binuclear complex is therefore about ten times that of the mononuclear complex. The probable conformations and bonding sites of the optically active species are discussed." @default.
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- W2032003173 date "1975-07-01" @default.
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- W2032003173 title "Absorption and circular dichroism spectra of the pyridoxylidenalanatoaluminum (III) complex" @default.
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- W2032003173 doi "https://doi.org/10.1016/s0006-3061(00)80084-8" @default.
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