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Fourier transform infrared studies of 1:12 and 1:11 heteropoly tungstates.

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dc.contributor.author Gupta, Mohanalāla.
dc.date.accessioned 2012-06-20T19:33:39Z
dc.date.available 2012-06-20T19:33:39Z
dc.date.created 1990 en_US
dc.date.issued 2012-06-20
dc.identifier.uri http://hdl.handle.net/123456789/1340
dc.description 151 leaves. en_US
dc.description.abstract Infrared spectroscopic features of 1:12 and 1:11 heteropoly tungstates were studied using FT -IR. Internal coordinate analysis revealed that 297 coordinates are required for the 1:12 heteropoly anions, and 303 for the1: 11 an ions. The spectra of compounds of these two families were identified and characterized using 'fingerprint' and computerized search methods. For the computer searches, four spectral libraries were created for the four different dispersive media, KBr, KC1, Nujol and CC14. Major bands were assigned to specific localized vibrations. An absorbance study was performed with selected compounds using a new weighing scheme. The accuracy of this scheme was matched with the usual technique for tripalmitin in CC14 solution and was found to be simpler and more advantageous. An unusual absorbance vs concentration behavior was observed. This phenomenon is interpreted in terms of different vibrational nature of the anions at different concentration ranges. The absorbance study also indicated that for a given heteropoly compound in non-polar solvents, the absorption proportionality constant is also a function of concentration. Some uncertainties were observed about the stability of these compounds in the solutions with respect to time and temperature. en_US
dc.language.iso en_US en_US
dc.subject Fourier transform infrared spectroscopy. en_US
dc.title Fourier transform infrared studies of 1:12 and 1:11 heteropoly tungstates. en_US
dc.type Thesis en_US
dc.college las en_US
dc.advisor A.M. Landis en_US
dc.department biological sciences en_US

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