Time-Resolved and Pulse EPR Study of Triplet States of Alkylketones in β-Cyclodextrin View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2011-10-18

AUTHORS

O. Krumkacheva, M. Tanabe, S. Yamauchi, M. Fedin, S. R. A. Marque, E. Bagryanskaya

ABSTRACT

The triplet states of deoxybenzoin (DOB) and benzophenone (BP) molecules in randomly methylated β-cyclodextrin (CD) cavity are studied by time-resolved (TR) and pulse electron paramagnetic resonance (EPR). The observed TR EPR spectrum of DOB in β-CD at 30 K is close to the spectrum measured in polar solvent trifluoroethanol, revealing strong hydration by water molecules. At the same time, TR EPR spectrum of BP in β-CD corresponds to nonpolar surrounding of the CO-group. The electron spin relaxation times T1 and T2 of triplet BP at 30 K measured by pulse EPR are found to be different in β-CD compared to nonpolar toluene glass. The observed increase of T2 by up to a factor of four in β-CD is caused by the lower vibration amplitude of CO-bond of BP due to the confinement in β-CD. The influence of β-CD with covalently attached nitroxide on the triplet states of DOB and BP is principally different: the excited triplet states could not be observed by TR EPR due to the efficient quenching of the excited states by nitroxide. More... »

PAGES

29-40

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00723-011-0289-2

DOI

http://dx.doi.org/10.1007/s00723-011-0289-2

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1044320049


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