28978-10-1Relevant articles and documents
G0ld-Boron Chemistry. Part 1. Synthetic, Structural, and Spectroscopic Studies on the Compounds (R=cyclo-C6H11 or C6H4Me-2)
Wynd, Adrew J.,McLennan, Alistar J.,Reed, David,Welch, Alan J.
, p. 2761 - 2768 (1987)
The new Class of 2 gold-boron compounds (1a; R=cyclo-C6H11; 1b, R=C6H4Me-2) have been prepared by the reaction between and B10H14 in CH2Cl2.Compound (1a) is also afforded by reaction between > and (1-).The exact mechanism of the first reaction is unclear, but probably proceeds via sequential oxidative addition and reductive elimination.Crystallographic analyses of compounds (1) show the expected decarborane-like geometry.There is some evidence of an intramolecular interaction between Au and the B(9)-H-B(10) bridge system.A thorough n.m.r. study of (1b) was undertaken, including an 11B(COSY) experiment which allowed almost complete assignment of the ten inequivalent B atoms in the molecule.
Systematically Tuning the Electronic Structure of Gold Nanoclusters through Ligand Derivatization
Cirri, Anthony,Morales Hernández, Hanna,Kmiotek, Christina,Johnson, Christopher J.
supporting information, p. 13818 - 13822 (2019/08/22)
While the ability to crystallize metal nanoclusters has revealed their geometric structure, the lack of a similarly precise measure of their electronic structure has hampered the development of synthetic design rules to precisely engineer their electronic properties. We track the evolution of highly-resolved electronic absorption spectra of gold nanoclusters with precisely mass-selected chemical composition in a controlled environment. Simple derivatization of the ligands yields larger spectral changes than varying the overall atomic composition of the cluster for two clusters with similar symmetry and size. The nominally metal-localized HOMO–LUMO transition of these nanoclusters lowers in energy linearly with increasing electron donation from the exterior of the ligand shell for both cluster sizes. Very weak surface interactions, such as binding of He or N2, yield significant state-dependent shifts, identifying states with significant interfacial character. These observations demonstrate a pathway for deliberate tuning of interfacial chemistry for chemical and technological applications.
Photosensitizer-Free, Gold-Catalyzed C–C Cross-Coupling of Boronic Acids and Diazonium Salts Enabled by Visible Light
Witzel, Sina,Xie, Jin,Rudolph, Matthias,Hashmi, A. Stephen K.
supporting information, p. 1522 - 1528 (2017/05/05)
The first photosensitizer-free visible light-driven, gold-catalyzed C–C cross-couplings of arylboronic acids and aryldiazonium salts are reported. The reactions can be conducted under very mild conditions, using a catalytic amount of tris(4-trifluoromethyl)phosphinegold(I) chloride [(4-CF3-C6H4)3PAuCl] with methanol as the solvent allowing an alternative access to a variety of substituted biaryls in moderate to excellent yields with broad functional group tolerance. (Figure presented.).
