A 13C‐Labeled Triarylmethyl Radical as an EPR Spin Probe Highly Sensitive to Molecular Tumbling. Issue 38 (21st July 2020)

• Record Type: Journal Article
• Authors: Poncelet, Martin; Driesschaert, Benoit
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 38(2020)
• Page Start: 16451
• Page End: 16454
• Publication Date: 2020-07-21
• Subjects: EPR spectroscopy -- isotopic labeling -- microviscosity -- spin probes -- triarylmethyl radical; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202006591
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: A stable triarylmethyl spin probe whose electron paramagnetic resonance (EPR) spectrum is highly sensitive to molecular tumbling is reported. The strong anisotropy of the hyperfine coupling tensor with the central carbon of a 13 C1 ‐labeled triarylmethyl radical enables the measurement of the probe rotational correlation time with applications to measure microviscosity and molecular dynamics. Abstract : Measuring tumbling : A stable 13 C1 ‐labeled triarylmethyl radical, whose EPR spectrum is highly sensitive to molecular tumbling, is presented. Owing to the strong anisotropy of the hyperfine coupling tensor, the probe rotational correlation time can be measured. Applications include determining microviscosity and molecular dynamics.