Effect of gel-trapping on spectral properties and relaxation dynamics of some spiro-oxazines

Article Abstract:

Studies done on the photochromism of three spiro-oxazines in a gel network (AOT/isooctane/animal gelatin/water), which is transparent to the visible and near UV light, as well as in a microemulsion (AOT/toluene/water) and in the hydrocarbon component of the microheterogeneous gelled system are reported. Trapping of photochromic molecules in a gel network may change the spectrum of the colored form and cause dramatic effects on its relaxation dynamics, which markedly affects the photocolorability.

Spectral analysis (Signal analysis)

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Preparation of a copper ion complex of sterically congested diphenyldiazomethanes having a pyridine and characterization of their photoproducts

Article Abstract:

Diphenyldiazomethanes (DPy-1-N2) having two pyridyl groups (bis{4-(4-pyridyl)-2,6-dimethylphenyl}-diazomethane (4,4'-DPy-1-N2) and {2,4-di(4-pyridyl)-6-bromophenyl}(2,6-dimethyl-4-tert-butylphenyl)diazomethane (2,4-DPy-1N2), are prepared to construct hetero-spin species and the magnetic properties of their photoproducts are characterized. The results have shown that a high-spin species is actually generated in the photoproducts and that the complexed carbenes have shown significant stability.

Japan, Magnetic properties, Copper ions, Structure, Photolysis

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Growth versus cyclization in the early stages of the polycondensation of metal alkoxides

Article Abstract:

The early steps of the polycondensation of transition metal alkoxide were studied from the chemical and structural points of view. The study reveals that the approach addresses difficulties raised by both coordinative unsaturation and cyclization in the modelization of the polycondensation of metal alkoxides and the difference is not constant along the polycondensation process, and its dependence on the extent of reaction provides evidence for the high apparent kinetics order of gelation.

Oxides, Ring formation (Chemistry), Cyclization (Chemistry)

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