title: Synthesis, structural characterization, and gas-phase unimolecular reactivity of the silver hydride nanocluster [Ag3((PPh2)2CH2)3(μ3-H)](BF4)2.
abstract: A bis(diphenylphosphino)methane-ligated trinuclear silver hydride nanocluster, [Ag3((Ph2P)2CH2)3(μ3-H)](BF4)2, featuring three silver(I) ions coordinated to a μ3-hydride, and its deuteride analogue, [Ag3((Ph2P)2CH2)3(μ3-D)](BF4)2, have been isolated and structurally characterized using electrospray ionization mass spectrometry (ESI-MS), X-ray crystallography, NMR and IR spectroscopy. The position of the deuteride in [Ag3((Ph2P)2CH2)3(μ3-D)](BF4)2 was determined by neutron diffraction. ESI-MS of [Ag3L3(μ3-H/D)](BF4)2 [L = ((Ph2P)2CH2)2] produces [Ag3L3(μ3-H/D)](2+) and [Ag3L3(μ3-H/D)(BF4)](+). A rich gas-phase ion chemistry of [Ag3L3(μ3-H/D)](2+) is observed under conditions of collision-induced dissociation (CID) and electron-capture dissociation (ECD). CID gives rise to the following complementary ion pairs: [Ag3L2](+) and [L+(H/D)](+); [Ag2(H/D)L2](+) and [AgL](+); [Ag2(H/D)L](+) and [AgL2](+). ECD gives rise to a number of dissociation channels including loss of the bis(phosphine) ligand, fragmentation of a coordinated bis(phosphine) ligand via C-P bond activation, and loss of a hydrogen (deuterium) atom with concomitant formation of [Ag3L3](+). Under CID conditions, [Ag3L3(μ3-H/D)(BF4)](+) fragments via ligand loss, the combined loss of a ligand and [H,B,F4], and cluster fragmentation to give [Ag2(BF4)L2](+) and [Ag2(L-H)L](+) [where (L-H) = (Ph2P)2CH(-)].
authors.affiliation: School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne , 30 Flemington Road, Parkville, Victoria 3010, Australia.
authors.forename: Athanasios
authors.initials: A
authors.lastname: Zavras
authors.forename: George N
authors.initials: GN
authors.lastname: Khairallah
authors.forename: Timothy U
authors.initials: TU
authors.lastname: Connell
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: White
authors.forename: Alison J
authors.initials: AJ
authors.lastname: Edwards
authors.forename: Roger J
authors.initials: RJ
authors.lastname: Mulder
authors.forename: Paul S
authors.initials: PS
authors.lastname: Donnelly
authors.forename: Richard A J
authors.initials: RA
authors.lastname: O'Hair
mesh_terms: D018360:Crystallography, X-Ray; D049329:Nanostructures; D009502:Neutrons; D066244:Proton Magnetic Resonance Spectroscopy; D012834:Silver / Q000737:chemistry*
chemical_list: D012834:Silver