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Photoluminescence Properties of [Core+<i>exo</i>]‑Type Au<sub>6</sub> Clusters: Insights into the Effect of Ligand Environments on the Excitation Dynamics

By Yukatsu Shichibu (1532320), Mingzhe Zhang (1464400), Takeshi Iwasa (1596988), Yuriko Ono (2617635), Tetsuya Taketsugu (1271238), Shun Omagari (1638637), Takayuki Nakanishi (1597186), Yasuchika Hasegawa (1597198) and Katsuaki Konishi (1532311)

Abstract

The use of multidentate chelating ligands enriches the geometric diversity of coordinated gold clusters, offering much knowledge to benefit the understanding of their unique electronic structures and optical properties. Herein we report different behaviors of [core+<i>exo</i>]-type Au<sub>6</sub> clusters bearing C3- and C4-bridged diphosphines (<b>1</b> and <b>2</b>), highlighting profound effects of the steric constraints of the ligand environments on the excited-state structural dynamics. Although the Au<sub>6</sub> geometries of <b>1</b> and <b>2</b> in the crystalline states were somewhat different, their absorption spectra in solution were almost similar. However, marked differences were found in the photoluminescence properties; phosphorescent-type emission was dominantly observed for <b>1</b>, whereas <b>2</b> gave both fluorescence- and phosphorescence-type emissions. Theoretical calculations showed that the bridging chains influence the geometries of the Au<sub>6</sub> unit in the excited states, leading to the observed differences in emission behaviors

Topics: Biophysics, Biochemistry, Biotechnology, Ecology, Plant Biology, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, 6 unit, gold clusters, ligand environments, Excitation Dynamics, phosphorescence-type emissions, C 4-bridged diphosphines, C 3-, 6 geometries, Ligand Environments, chains influence, photoluminescence properties, 6 Clusters, Photoluminescence Properties, Theoretical calculations, steric constraints, emission behaviors, absorption spectra, 6 clusters, exo, phosphorescent-type emission, multidentate chelating ligands
Year: 2019
DOI identifier: 10.1021/acs.jpcc.9b01810.s003
OAI identifier: oai:figshare.com:article/7827869
Provided by: FigShare
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