Uncovering a CF3 Effect on X-ray Absorption Energies of [Cu(CF3)4]− and Related Copper Compounds by Using Resonant Diffraction Anomalous Fine Structure (DAFS) Measurements**
Pinar Alayoglu
Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607 USA
Search for more papers by this authorTieyan Chang
NSF's ChemMatCARS, University of Chicago, Argonne, IL 60439 USA
Search for more papers by this authorConnly Yan
Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607 USA
Search for more papers by this authorYu-Sheng Chen
NSF's ChemMatCARS, University of Chicago, Argonne, IL 60439 USA
Search for more papers by this authorCorresponding Author
Neal P. Mankad
Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607 USA
Search for more papers by this authorPinar Alayoglu
Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607 USA
Search for more papers by this authorTieyan Chang
NSF's ChemMatCARS, University of Chicago, Argonne, IL 60439 USA
Search for more papers by this authorConnly Yan
Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607 USA
Search for more papers by this authorYu-Sheng Chen
NSF's ChemMatCARS, University of Chicago, Argonne, IL 60439 USA
Search for more papers by this authorCorresponding Author
Neal P. Mankad
Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607 USA
Search for more papers by this authorA previous version of this manuscript has been deposited on a preprint server (https://doi.org/10.26434/chemrxiv-2023-klcfp).
Abstract
Understanding the electronic structures of high-valent metal complexes aids the advancement of metal-catalyzed cross coupling methodologies. A prototypical complex with formally high valency is [Cu(CF3)4]− (1), 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 1 by X-ray spectroscopies have led previous authors to contradictory conclusions, motivating the re-examination of its X-ray 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 1, here it is shown that there is a systematic trifluoromethyl effect on X-ray absorption that blue shifts the resonant Cu K-edge energy by 2–3 eV per CF3, completely accounting for observed changes in DAFS profiles between formally Cu(III) complexes like 1 and formally Cu(I) complexes like (Ph3P)3CuCF3 (3). Thus, in agreement with the inverted ligand field model, the data presented herein imply that 1 is best described as containing a Cu(I) ion with dn count approaching 10.
Conflict of interest
The authors declare no conflict of interest.
Open Research
Data Availability Statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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| ange202313744-sup-0001-bpyCuCF3_3.cif514.2 KB | Supporting Information |
| ange202313744-sup-0001-CuBr4_m.cif624.8 KB | Supporting Information |
| ange202313744-sup-0001-CuCF3_4.cif7.5 MB | Supporting Information |
| ange202313744-sup-0001-misc_information.pdf1,011.4 KB | Supporting Information |
| ange202313744-sup-0001-p3cucf3_m.cif9.8 MB | Supporting Information |
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