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Cupriphication of gold to sensitize d10-d10 metal-metal bonds and near-unity phosphorescence quantum yields.


ABSTRACT: Outer-shell s0/p0 orbital mixing with d10 orbitals and symmetry reduction upon cupriphication of cyclic trinuclear trigonal-planar gold(I) complexes are found to sensitize ground-state Cu(I)-Au(I) covalent bonds and near-unity phosphorescence quantum yields. Heterobimetallic Au4Cu2 {[Au4(?-C2,N3-EtIm)4Cu2(µ-3,5-(CF3)2Pz)2], (4a)}, Au2Cu {[Au2(?-C2,N3-BzIm)2Cu(µ-3,5-(CF3)2Pz)], (1) and [Au2(?-C2,N3-MeIm)2Cu(µ-3,5-(CF3)2Pz)], (3a)}, AuCu2 {[Au(?-C2,N3-MeIm)Cu2(µ-3,5-(CF3)2Pz)2], (3b) and [Au(?-C2,N3-EtIm)Cu2(µ-3,5-(CF3)2Pz)2], (4b)} and stacked Au3/Cu3 {[Au(?-C2,N3-BzIm)]3[Cu(µ-3,5-(CF3)2Pz)]3, (2)} form upon reacting Au3 {[Au(?-C2,N3-(N-R)Im)]3 ((N-R)Im = imidazolate; R = benzyl/methyl/ethyl = BzIm/MeIm/EtIm)} with Cu3 {[Cu(?-3,5-(CF3)2Pz)]3 (3,5-(CF3)2Pz = 3,5-bis(trifluoromethyl)pyrazolate)}. The crystal structures of 1 and 3a reveal stair-step infinite chains whereby adjacent dimer-of-trimer units are noncovalently packed via two Au(I)?Cu(I) metallophilic interactions, whereas 4a exhibits a hexanuclear cluster structure wherein two monomer-of-trimer units are linked by a genuine d10-d10 polar-covalent bond with ligand-unassisted Cu(I)-Au(I) distances of 2.8750(8) Å each-the shortest such an intermolecular distance ever reported between any two d10 centers so as to deem it a "metal-metal bond" vis-à-vis "metallophilic interaction." Density-functional calculations estimate 35-43 kcal/mol binding energy, akin to typical M-M single-bond energies. Congruently, FTIR spectra of 4a show multiple far-IR bands within 65-200 cm-1, assignable to vCu-Au as validated by both the Harvey-Gray method of crystallographic-distance-to-force-constant correlation and dispersive density functional theory computations. Notably, the heterobimetallic complexes herein exhibit photophysical properties that are favorable to those for their homometallic congeners, due to threefold-to-twofold symmetry reduction, resulting in cuprophilic sensitization in extinction coefficient and solid-state photoluminescence quantum yields approaching unity (?PL = 0.90-0.97 vs. 0-0.83 for Au3 and Cu3 precursors), which bodes well for potential future utilization in inorganic and/or organic LED applications.

SUBMITTER: Galassi R 

PROVIDER: S-EPMC5495244 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Cupriphication of gold to sensitize d<sup>10</sup>-d<sup>10</sup> metal-metal bonds and near-unity phosphorescence quantum yields.

Galassi Rossana R   Ghimire Mukunda M MM   Otten Brooke M BM   Ricci Simone S   McDougald Roy N RN   Almotawa Ruaa M RM   Alhmoud Dieaa D   Ivy Joshua F JF   Rawashdeh Abdel-Monem M AM   Nesterov Vladimir N VN   Reinheimer Eric W EW   Daniels Lee M LM   Burini Alfredo A   Omary Mohammad A MA  

Proceedings of the National Academy of Sciences of the United States of America 20170614 26


Outer-shell s<sup>0</sup>/p<sup>0</sup> orbital mixing with d<sup>10</sup> orbitals and symmetry reduction upon cupriphication of cyclic trinuclear trigonal-planar gold(I) complexes are found to sensitize ground-state Cu(I)-Au(I) covalent bonds and near-unity phosphorescence quantum yields. Heterobimetallic Au<sub>4</sub>Cu<sub>2</sub> {[Au<sub>4</sub>(μ-C<sup>2</sup>,N<sup>3</sup>-EtIm)<sub>4</sub>Cu<sub>2</sub>(µ-3,5-(CF<sub>3</sub>)<sub>2</sub>Pz)<sub>2</sub>], (4a)}, Au<sub>2</sub>Cu {[Au<su  ...[more]

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