Journal article

Publication year: 2021

Pages: 11305-11309

Journal: Angewandte Chemie International Edition

Volume number: 60

Issue number: 20

ISSN: 1433-7851

Open access status: Hybrid

DOI Link: https://doi.org/10.1002/anie.202016020

Publisher: Wiley

Abstract: 
The triphenylmethane and all-meta tert-butyl triphenylmethane dimers, (TPM)(2) and (T (BuPM)-Bu-t)(2), respectively, were studied with ionization loss stimulated Raman spectroscopy in molecular beam experiments to resolve structure sensitive vibrations. This answers the question whether the recently reported linear head-to-head arrangement in (T (BuPM)-Bu-t)(2) results from crystal packing or prevails also in the gas phase, and therefore must result from extraordinarily strong London dispersion (LD) interactions. Our study clearly demonstrates that the head-to-head arrangement is maintained even under isolated molecular beam conditions in the absence of crystal packing effects. The central Raman-active aliphatic C-D vibration of appropriately deuterated (T (BuPM)-Bu-t)(2) associated with an unusually short C-D...D-C distance exhibits a strong blue-shift compared to the undisturbed case. As the LD stabilizing tert-butyl groups are absent in (TPM)(2), it displays an approximately S-6-symmetric tail-to-tail arrangement.

Harvard Citation style: Maué, D., Strebert, P., Bernhard, D., Rösel, S., Schreiner, P. and Gerhards, M. (2021) Dispersion-Bound Isolated Dimers in the Gas Phase: Observation of the Shortest Intermolecular CH...H-C Distance via Stimulated Raman Spectroscopy, Angewandte Chemie International Edition, 60(20), pp. 11305-11309. https://doi.org/10.1002/anie.202016020

APA Citation style: Maué, D., Strebert, P., Bernhard, D., Rösel, S., Schreiner, P., & Gerhards, M. (2021). Dispersion-Bound Isolated Dimers in the Gas Phase: Observation of the Shortest Intermolecular CH...H-C Distance via Stimulated Raman Spectroscopy. Angewandte Chemie International Edition. 60(20), 11305-11309. https://doi.org/10.1002/anie.202016020