Investigation of copper oxidation states in plasmonic nanomaterials by XAS and Raman spectroscopy

Abstract

A shell-isolated nanoparticle enhanced surface Raman technique and XANES for detection of copper(ii) or copper(i) plasmonic-nanocatalysts.

Trace Cu(II)-Mediated Selective Oxidation of Benzothiazole: The Predominance of Sequential Cu(II)–Cu(I)–Cu(III) Valence Transition and Dissolved Oxygen

“…It is generally accepted that the N atom of the BTH thiazole ring can coordinate with Cu­(II). , The in situ confocal Raman spectrum of Cu­(II)/PDS/BTH (Figure c) shows emerging bands at 293, 447, and 463 cm –1 , which can be attributed to the stretching vibrations of Cu­(I)–N and Cu­(II)–N (both symmetric and asymmetric). , The weak vibrations at 273 and 499 cm –1 originate from Cu­(II)–S stretching and ring deformation of the BTH molecules. , The Raman characterization further exhibits the Cu­(II)-BTH coordination and the subsequent interaction of the coordinated Cu­(II) with PDS. To further verify whether S of the thiazole ring contributes to BTH degradation by PDS/Cu­(II), two BTH analogues [i.e., benzothiophene (BTP) and benzoxazole (BXZ)] were treated.…”