Journal Article

FZJ-2025-01714

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Using potassium bromide pellets and optical spectroscopy to assess the photodimerization of two trans -(trifluoromethyl)-cinnamic acid compounds

Ulambayar, B. ; Batchuluun, K. ; Bariashir, C. ; Uranbileg, N. ; Stammler, F. J. ; Davaasambuu, J. ; Schrader, T. E. (Corresponding author)FZJ*

2024
RSC London

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Please use a persistent id in citations: doi:10.1039/D4CE00205A  doi:10.34734/FZJ-2025-01714

Abstract: The potential solid-state [2 + 2] photodimerization of two trans-cinnamic acid derivatives, trans-4-(trifluoromethyl)cinnamic acid (4-tfmca) and trans-3-(trifluoromethyl)cinnamic acid (3-tfmca), has been studied using potassium bromide (KBr) pellets and optical spectroscopy. As opposed to taking a powder or single crystal material as a sample, herein, we used polycrystalline samples incorporated in the KBr matrix (pellet) and were able to follow the course of the photochemical reaction via optical spectroscopy. The results show that the photodimerization of 4-tfmca within the KBr matrix yields a photodimer in roughly 100% conversion, while the changes observed for 3-tfmca within the KBr matrix suggest a subtle photochemical change which could not be observed when irradiating the neat powder. This suggests that the KBr matrix helps to couple light into the crystallites of the embedded sample and shows that the KBr matrix reveals photochemistry which might not have been found in the single crystal or powder state of the sample.

Keyword(s): Chemical Reactions and Advanced Materials (1st) ; Chemistry (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Heinz Maier-Leibnitz Zentrum (MLZ)
3. JCNS-4 (JCNS-4)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. BIODIFF: Diffractometer for large unit cells (NL1)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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