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2. ChemInform Abstract: Role of Li+Ion in the Luminescence Enhancement of Lanthanide Ions: Favorable Modifications in Host Matrices

Author

S.B. Rai, Akhilesh Kumar Singh, and S. K. Singh

Subjects
Alkali ions, Lanthanide, Matrix (mathematics), Chemistry, General Medicine, Luminescence, Photochemistry, Excitation, Ion
Abstract

Lanthanide based materials are preferred over other luminescent materials for various applications. Current focus in this area is to exploit the unique luminescence features of lanthanide-based materials for multidisciplinary research and novel applications. Furthermore, efforts are going on to enhance the luminescence of lanthanide ions for better performance. In a broader sense, there are two ways to enhance the luminescence of lanthanide ions. The first is to use a suitable sensitizer, which can absorb excitation energy efficiently, and can transfer it to the lanthanide ions. This method has been known for a long time and is well documented in the literature. The second way is to modify host matrices in such a way that it favors radiative transitions. It is widely reported in the literature that the presence of alkali ions, particularly Li+ ions, in a matrix enhances the luminescence of lanthanide ions significantly. But there are no comprehensive reports available in the literature that summarize how alkali ions help in the luminescence enhancement of lanthanide ions in various host matrices. The prime objective of this review is to highlight various contributing factors that help in the luminescence enhancement of lanthanide ions in the presence of alkali ions.

Published
2014

6. Reductive Amination of Glycosyl Aldoses: Synthesis of N-Glycosylated β-Glycosyl Amino Alcohols and Their Enzyme Inhibitory Effect

Author

Akhilesh Kumar Tamarakar, Ram Chandra Mishra, Shyam Sunder Verma, Brajendra K. Tripathi, Rama P. Tripathi, and Arvind K. Srivastava

Subjects
chemistry.chemical_classification, Amino esters, Brush border, Stereochemistry, General Medicine, Reductive amination, carbohydrates (lipids), Sodium borohydride, chemistry.chemical_compound, Glycogen phosphorylase, Enzyme, chemistry, Yield (chemistry), Organic chemistry, Glycosyl
Abstract

Reductive amination of glycosyl aldehydes (1a–c, 2) with glycosyl amino esters (3a–c, 4) in the presence of sodium borohydride gave diglycosylated amino esters (5–15) in good yield. N‐Glycosyl‐glycosylated amino esters were reduced to the respective diglycosyl amino alcohols (16–26) with LiAlH4 in good yield. All the synthesized compounds were studied for their inhibitory effect, if any, against hepatic glucose‐6‐phosphatase, glycogen phosphorylase, and intestinal brush border membrane α‐glucosidase; among these compounds 7, 21, and 25 have shown marked inhibition on these enzymes, respectively. #CDRI Communication No. 6605.

Published
2006

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