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Cluster transformation of [Cu3(μ3-H)(μ3-BH4) ((PPh2)2NH)3](BF4) to [Cu3(μ3-H)(μ2,μ1-S2CH) ((PPh2)2NH)3](BF4) via reaction with CS2. X-ray structural characterisation and reactivity of cationic clusters explored by multistage mass spectrometry and computational studies
journal contribution
posted on 2023-05-19, 13:16 authored by Ma, HZ, Li, J, Allan CantyAllan Canty, O'Hair, RAJThe copper nanocluster [Cu3(μ3-H)(μ3-BH4)LPh3](BF4), 1a·BF4 (LPh = (PPh2)2NH = dppa), can potentially react with substrates at either the coordinated hydride or borohydride sites. Reaction of 1a·BF4 with CS2 has given rise to [Cu3(μ3-H)(μ2,μ1-S2CH)LPh3](BF4), (2a·BF4), which was structurally characterised using electrospray ionisation (ESI) with high-resolution mass spectrometry (HRMS), X-ray crystallography, NMR, IR and UV-Vis spectroscopy. The copper(I) atoms adopt a planar trinuclear Cu3 geometry coordinated on the bottom face by a μ3-hydride, on the top face by a μ2,μ1-dithioformate and surrounded by three bridging LPh ligands. Reaction of 1a·BF4 with elemental sulfur gives the known cluster [Cu4(LPh-H + 2S)3](BF4), (3·BF4), which was structurally characterised via X-ray crystallography. ESI-MS of 2a·BF4 produces [Cu3(H)(S2CH)LPh3]+ and its gas-phase ion chemistry was examined under multistage mass spectrometry conditions using collision-induced dissociation (CID). The primary product, [Cu3(H)(S2CH)LPh2]+, formed via ligand loss, undergoes further fragmentation via loss of thioformaldehyde to give [Cu3(S)LPh2]+. DFT calculations exploring rearrangement and fragmentation of the model system [Cu3(H)(S2CH)LMe2]+ (LMe = (PMe2)2NH = dmpa) provide a feasible mechanism. Thus, coupling of the coordinated hydride with the dithioformate ligands gives [Cu3(S2CH2)LMe2]+, which then undergoes CH2S extrusion via C–S bond cleavage to give [Cu3(S)LMe2]+.
History
Publication title
Dalton TransactionsVolume
46Pagination
14995-15003ISSN
1477-9226Department/School
School of Natural SciencesPublisher
Royal Soc ChemistryPlace of publication
Thomas Graham House, Science Park, Milton Rd, Cambridge, England, Cambs, Cb4 0WfRights statement
Copyright 2017 The Royal Society of ChemistryRepository Status
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