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Wavelength shifts in solid‐state circular dichroism spectra: A possible explanation
Author(s) -
Castiglioni Ettore,
Abbate Sergio,
Longhi Giovanna,
Gangemi Roberto
Publication year - 2007
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.20404
Subject(s) - chemistry , spectral line , flattening , chirality (physics) , wavelength , circular dichroism , absorption spectroscopy , absorption (acoustics) , molecular physics , chloride , analytical chemistry (journal) , maxima , crystallography , optics , chiral symmetry , organic chemistry , physics , materials science , quantum mechanics , astronomy , nambu–jona lasinio model , composite material , quark , art , performance art , art history
Abstract We have devised an artificial sampling approach generating “absorption flattening” (AF) on the UV–Vis spectrum of a solution of a chiral compound: Tris (ethylendiamine)cobalt(III) chloride (Λ‐Co(en) 3 Cl 3 ). We have observed a concomitant red shift of the CD maxima. Related CD and absorption spectra have been calculated from spectra recorded on diluted homogeneous solutions, thus monitoring the effect of AF on both types of data. Experimental data are in good agreement with calculated spectra. Simulations with suitable bandshapes show that the red shift of the CD spectrum is due to AF. On the basis of these results, we conclude that AF is an important cause of distortions in CD spectra for inhomogeneous samples. Plans to compensate or at least to take into account this effect are presented. Chirality, 2007. © 2007 Wiley‐Liss, Inc.