Chemical state determination of molecular gallium compounds using XPS. Issue 18 (7th April 2016)

• Record Type: Journal Article
• Authors: Bourque, Jeremy L.; Biesinger, Mark C.; Baines, Kim M.
• Is Part Of: Dalton transactions. Volume 45:Issue 18(2016)
• Page Start: 7678
• Page End: 7696
• Publication Date: 2016-04-07
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c6dt00771f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The chemical state of novel gallium complexes are readily determined using X-ray Photoelectron Spectroscopy providing unprecedented insight into reactivity. Abstract : A series of molecular gallium compounds were analyzed using X-ray photoelectron spectroscopy (XPS). Specifically, the Ga 2p3/2 and Ga 3d5/2 photoelectron binding energies and the Ga L3 M45 M45 Auger electron kinetic energies of compounds with gallium in a range of assigned oxidation numbers and with different stabilizing ligands were measured. Auger parameters were calculated and used to generate multiple chemical speciation (or Wagner) plots that were subsequently used to characterize the novel gallium–cryptand[2.2.2] complexes1–3 that possess ambiguous oxidation numbers for gallium. The results presented demonstrate the ability of widely accessible XPS instruments to experimentally determine the chemical state of gallium centers and, as a consequence, provide deeper insights into reactivity compared to assigned oxidation and valence numbers.