Principles of Optical Spectroscopy of Aromatic Alloy Nanomolecules: Au36–xAgx(SPh-tBu)24

• Published in: Journal of physical chemistry. C Vol. 122; no. 8 p.4524-4531; pp. 4524 - 4531
• Main Authors: Theivendran, Shevanuja, Chang, Le, Mukherjee, Aneek, Sementa, Luca, Stener, Mauro, tunelli, Alessandro, Dass, Amala
• Format: Journal Article
• Language: English
• Published: 01.03.2018
• Subjects: absorption; alloys; prediction; silver; spectroscopy
• ISSN: 1932-7455
• DOI: 10.1021/acs.jpcc.8b00556

Here, we report the synthesis and experimental and theoretical characterizations of Au₃₆–ₓAgₓ(SPh-tBu)₂₄ alloy nanomolecule to atomic precision. By changing the incoming gold-to-silver metal ratio during the synthesis of crude mixture, up to eight silver atoms can be incorporated into Au₃₆(SPh-tBu)₂₄, as theoretically confirmed and rationalized in terms of its core and staple structure. Tuning of optical response by Ag doping is strongly affected by aromatic conjugation and qualitatively different with respect to the aliphatic case, with a strikingly nonmonotonic behavior of absorption intensity in the low- and high-energy regions, in fair agreement with theoretical predictions, as rationalized via an original analysis tool: independent component mapping of oscillatory strength plots.