• T SAKUNTALA

Articles written in Bulletin of Materials Science

• Benzoic acid derivatives under pressure: a Raman spectroscopic overview

Benzoic acid derivatives display diverse physical properties depending upon the nature and position of the functional groups. The presence of non-bonded interactions that come into play because of various functional groups in these materials is discussed with the help of density functional theory calculations and Raman spectroscopic studies at ambient conditions and slightly elevated pressures.

• High pressure phase transitions in diglycine perchlorate: a Raman spectroscopic study

We report high pressure studies on an organic perchlorate system diglycine perchlorate (DGPCl) up to 15 GPa. Single crystals of DGPCl were studied using high pressure Raman spectroscopy, which show discontinuous spectral changes at two pressures across ${\sim}$1.8 and ${\sim}$9 GPa. While the low pressure phase transition is primarily governed by the reorientational changes in organic groups and the corresponding hydrogen bonds, the high pressure transition involves substantial changes in Raman spectroscopic features of the perchlorate group. The splitting of the characteristic and the most intense Raman mode, i.e., perchlorate symmetric stretching mode, above 9 GPa suggests modifications in perchlorate group local structure. The structural changes are found to be reversible upon pressure release.

• # Bulletin of Materials Science

Volume 46, 2023
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020