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Instruments / Technical Area	Publication Details	Published	Actions
B23-Circular Dichroism	Electronic circular dichroism imaging (ECDi) casts a new light on the origin of solid-state chiroptical properties Marcin Gorecki , Filippo Lipparini , Gianluigi Albano , Tamas Javorfi , Rohanah Hussain , Giuliano Siligardi , Gennaro Pescitelli , Lorenzo Di Bari Chemistry – A European Journal 9 DOI: 10.1002/chem.202103632 Diamond Proposal Number(s): [17621, 19225] Show Abstract ▼ Abstract: Solid-state ECD (ss-ECD) spectra of a model microcrystalline solid, finasteride, dispersed into a KCl pellet were recorded by using the synchrotron radiation source at the Diamond B23 beamline. Scanning a surface of 36 mm2 with a step of 0.5 mm, we measured a set of ECD imaging (ECDi) spectra very different from each other and from the ss-ECD recorded with a bench-top instrument (1 cm2 area). This is due to the anisotropic part of the ECD (ACD), which averages to zero in solution or on a large number of randomly oriented crystallites, but can otherwise be extremely large. Two-way singular value decomposition (SVD) analysis, through experimental and simulated TDDFT spectra, disclosed that the measured and theoretical principal components are in line with each other. This finding demonstrates that the observed isotropic ss-ECD spectrum is governed by the anisotropy of locally oriented crystals. It also introduces a new quality for ss-ECD measurements and opens a new future for probing and mapping chiral materials in the solid state such as active pharmaceutical ingredients (APIs).	Dec 2021

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B23-Circular Dichroism

Electronic circular dichroism imaging (ECDi) casts a new light on the origin of solid-state chiroptical properties

Marcin Gorecki , Filippo Lipparini , Gianluigi Albano , Tamas Javorfi , Rohanah Hussain , Giuliano Siligardi , Gennaro Pescitelli , Lorenzo Di Bari

Chemistry – A European Journal 9

DOI: 10.1002/chem.202103632

Diamond Proposal Number(s): [17621, 19225]

Show Abstract ▼

Dec 2021