The C=C Stretching Vibrations of κ-(BEDT–TTF)2Cu[N(CN)2]Br and Its Isotope Analogues

2001/07/05 by Mikhail Maksimuk, M. Maksimuk, K. Yakushi +7 · 3 citations
Chemistry · Materials Science · Physics and Astronomy · #Inorganic Chemistry and Materials #Magnetism in coordination complexes #Organic and Molecular Conductors Research #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1143/jpsj.70.3728

published as Journal of the Physical Society of Japan, Vol.70 No.12, December, 2001 pp.3728-3738 · 8 figures, submitted to the Journal of the Physical Society of Japan

arxiv created 2001/07/05 · openalex publication_date 2001/12/15 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The C=C stretching modes in resonance Raman spectra and infrared reflectivity were measured at temperatures between 15 K and 300 K using various polarizations in k-(BEDT-TTF)₂Cu[N(CN)₂]Br, its fully and partially deuterated analogues, and ¹³C-substituted analogue. The infrared- and Raman-active bands were re-assigned based on the factor group analysis. We found a Raman-active EMV-coupled ν₃ mode near 1420 cm_-1, which shows a large downshift and broadening through the inter-dimer EMV interaction. The mixing of the bridge and ring C=C stretching vibrations depends upon the symmetry of the crystal mode. In contrast to deuterated crystals, the non-deuterated crystals show a splitting in the ν₂, ν₃, and ν₂₇ bands.

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