✍ Scribed by Attilio Cesàro; Franco Delben; Antonella Flaibani; Sergio Paoletti
No coin nor oath required. For personal study only.
and circular dichroic spectra of lead(I1) complexed by uronates and polyuronates in aqueous 0.05~ NaClO, are presented for the first time. It is shown that not only the carboxylate spectral bands are substantially modified by the interaction, but also the bands of the cation, shifted to higher wavelengths, become optically active. The sign of some bands reflects the stereochemistry of the sugar unit(s) in the complex. On increasing the ion-touronate molar ratio, R, the intensity of some bands, changes in a discontinuous mode, suggesting that two types of complex are formed at low and at high values, respectively, of R. The relevance of this structural information to the model of chain dimerization occurring with other divalent cations is discussed.
📜 SIMILAR VOLUMES
It x% iii be shown thar Factors of virtually no influence on the vibronic structure of the absorption spectra in biaryls may profoundly change the corresponding vibronic structure in the CD spectra. This is illustrated by the theoretica analysis of the experimental vibronic absorption and CD spectra
The absorption and magnetic circular dichroism (MCD) spectra of CGO isolated in Ar matrices have been measured in the visible and near-ultraviolet. The first two allowed bands (at 2326 and z 253 nm) show substantial negative .d terms. Sharp, weak vibronic structure showing clear evidence.of Jahn-Tel