The Au25(SR)18 cluster carrying icosahedral dodecaborate and glutathione ligands: A spectroscopic view

0534466 - ÚACH 2022 RIV GB eng J - Článek v odborném periodiku
Valušová, E. - Kaňuchová, M. - Baše, Tomáš - Víglaský, V. - Antalík, M.
The Au25(SR)18 cluster carrying icosahedral dodecaborate and glutathione ligands: A spectroscopic view.
Journal of Physics and Chemistry of Solids. Roč. 150, MAR (2021), č. článku 109838. ISSN 0022-3697. E-ISSN 1879-2553
Institucionální podpora: RVO:61388980
Klíčová slova: Optoelectronic nanomaterials * Spectroscopy * Coating * Chirality
Obor OECD: Inorganic and nuclear chemistry
Impakt faktor: 4.383, rok: 2021
Způsob publikování: Open access s časovým embargem

The functionality of Au25(S-glutathione)18 clusters change when some of the ligands in the cluster shell are replaced for other species. In this study we report on the synthesis and characterisation of a new cluster in which undecahydro-closo-dodecaborate thiolates are introduced as constituents of the shell surrounding the gold core. This is the first reported example in which the Au13 core of the Au25(S-glutathione)18 cluster is covered with an Au–S–B linkage instead of an Au–S–C on the dimeric shell units using a ligand exchange reaction. The spectra of the new cluster species clearly indicate a successful ligand exchange while retaining the gold core with undisrupted semirings containing both thiolate species. The resulting clusters were identified as Au25 [(S-glutathione)18-x (S-closo-borate)x-)] (x = 3, 4). Despite the achiral character of the closo-borate thiolates entering the semiring, increased chirality traces were observed in the high-energy region. Circular dichroism (CD) responses are ligand dependent and provide a fingerprint characteristic of the ligands present in the cluster. The next generation of such surface functionalized clusters provides unique base for computational and application studies.
Trvalý link: http://hdl.handle.net/11104/0316487