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A prototypical complex with formally high valency is [Cu(CF<jats:sub>3<\/jats:sub>)<jats:sub>4<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> (<jats:bold>1<\/jats:bold>), which has a formal Cu(III) oxidation state but whose physical analysis has led some to a Cu(I) assignment in an inverted ligand field model. Recent examinations of <jats:bold>1<\/jats:bold> by X\u2010ray spectroscopies have led previous authors to contradictory conclusions, motivating the re\u2010examination of its X\u2010ray absorption profile here by a complementary method, resonant diffraction anomalous fine structure (DAFS). From analysis of DAFS measurements for a series of seven mononuclear Cu complexes including <jats:bold>1<\/jats:bold>, here it is shown that there is a systematic trifluoromethyl effect on X\u2010ray absorption that blue shifts the resonant Cu K\u2010edge energy by 2\u20133\u2005eV per CF<jats:sub>3<\/jats:sub>, completely accounting for observed changes in DAFS profiles between formally Cu(III) complexes like <jats:bold>1<\/jats:bold> and formally Cu(I) complexes like (Ph<jats:sub>3<\/jats:sub>P)<jats:sub>3<\/jats:sub>CuCF<jats:sub>3<\/jats:sub> (<jats:bold>3<\/jats:bold>). Thus, in agreement with the inverted ligand field model, the data presented herein imply that <jats:bold>1<\/jats:bold> is best described as containing a Cu(I) ion with d<jats:sup>n<\/jats:sup> count approaching 10.<\/jats:p>","DOI":"10.1002\/anie.202313744","type":"journal-article","created":{"date-parts":[[2023,11,8]],"date-time":"2023-11-08T14:49:23Z","timestamp":1699454963000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Uncovering a CF<sub>3<\/sub> Effect on X\u2010ray Absorption Energies of [Cu(CF<sub>3<\/sub>)<sub>4<\/sub>]<sup>\u2212<\/sup> and Related Copper Compounds by Using Resonant Diffraction Anomalous Fine Structure (DAFS) Measurements**"],"prefix":"10.1002","volume":"62","author":[{"given":"Pinar","family":"Alayoglu","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Illinois at Chicago  Chicago IL 60607 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