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Synthetically Reversible, Proton-Mediated Nitrite N–O Bond Cleavage at a Dicopper Site

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.4c14642· OSTI ID:2480763
A monocationic dicopper(I,I) nitrite complex [Cu2(μ-κ11-O2N)DPFN][NTf2] (2) (DPFN = 2,7-bis(fluoro-di(2-pyridyl)methyl)-1,8-naphthyridine, NTf2 = N(SO2CF3)2), was synthesized by treatment of a dicopper acetonitrile complex, [Cu2(μ-MeCN)DPFN][NTf2]2 (1), with tetrabutylammonium nitrite ([nBu4N][NO2]). DFT calculations indicate that 2 is one of three linkage isomers that are close in energy and presumably accessible in solution. Reaction of the μ-κ11-O2N complex with p-TolSH produces nitrous acid (HONO) and the corresponding dicopper thiolate species via an acid–base exchange reaction. Notably, treatment of 2 with HNTf2 results in N–O bond cleavage in the putative, HONO-ligated complex to form the more thermodynamically favorable nitrosyl-bridged dicopper complex [Cu2(μ-NO)(μ-OH)DPFN][NTf2]2 (4). This scission can be reversed via deprotonation of the hydroxy ligand with KOtBu. X-ray diffraction studies confirmed the solid-state molecular structures of 2 and 4. DFT calculations were used to construct a reaction coordinate diagram detailing formation of the μ-NO complex and to describe its electronic structure. The nitrosyl ligand in 4 is chemically labile, as demonstrated by its ready displacement in reactions with CO or NO2.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
Sponsoring Organization:
National Institutes of Health (NIH); National Science Foundation (NSF); US Department of Energy; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Chemical Sciences, Geosciences & Biosciences Division (SC-22.1); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231; FG02-03ER15387
OSTI ID:
2480763
Alternate ID(s):
OSTI ID: 2482246
OSTI ID: 2568342
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 50 Vol. 146; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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