Understanding Structural Variations in Elastic Organic Crystals by in Situ High-Pressure Fourier Transform Infrared Spectroscopy and Nanoindentation Study

Ganguly, S and Chinnasamy, R and Parikh, S and Kiran, MSRN and Ramamurty, U and Bhatt, H and Deo, MN and Ghosh, S and Ghalsasi, P (2019) Understanding Structural Variations in Elastic Organic Crystals by in Situ High-Pressure Fourier Transform Infrared Spectroscopy and Nanoindentation Study. In: Crystal Growth and Design .

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Abstract

Organic crystals possessing elasticity are gaining wide attention due to their potential applications in technology. From a design perspective, it is of utmost importance to understand the mechanical behavior of these crystals and their ability to handle stress. In this paper, we present an in situ high-pressure Fourier transform infrared spectroscopy study on 2,5-dichloro-N-benzylidene-4-chloroaniline (DPA) and 2,6 dichloro-N-benzylidene-4-fluoro-3-nitro aniline (DFA) crystals at pressures ranging from ambient pressure to 21.5 and 14.5 GPa respectively along with nanoindentation studies, at room temperature. The infrared stretching wavenumber of the aromatic and aliphatic C-H, H-C=N, and C-Cl bands on compression showed blueshifts and increased widths, which reflect structure perturbation caused by changes in intermolecular interactions in the crystals. It was noted that both crystals DPA and DFA behave in a different fashion under high-pressure prompting the derivation of different models based on structural changes in the lattice. Further, nanoindentation studies corroborated pressure-induced molecular movement in both crystals. © Copyright 2019 American Chemical Society.

Item Type:	Journal Article
Publication:	Crystal Growth and Design
Publisher:	American Chemical Society
Additional Information:	Copy right for this article belongs to American Chemical Society
Keywords:	Aniline; Chlorine compounds; Fourier transform infrared spectroscopy; Nanoindentation, Ambient pressures; High pressure; Infrared stretching; Intermolecular interactions; Mechanical behavior; Molecular movement; Organic crystal; Structural variations, Crystal structure
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	16 Apr 2019 06:46
Last Modified:	16 Apr 2019 06:46
URI:	http://eprints.iisc.ac.in/id/eprint/62115

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