Structure of the Observable Histidine Radical Cation in the Gas Phase: A Captodative α‐Radical Ion

Abstract

The observable histidine radical cation generated by collision-induced dissociation of the [CuII(2,2′:6′,2′′-terpyridine)(His)].2+ complex carries the positive charge on the protonated imidazole ring and the radical formally on the α carbon. This structure has been confirmed by infrared multiple photon dissociation (IRMPD) spectroscopy and density functional calculations. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.