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Bright and Long‐Lived Emission from a Starburst‐Type Arylborane‐Appended Polypyridyl Ruthenium(II) Complex
Author(s) -
Nakagawa Atsushi,
Ito Akitaka,
Sakuda Eri,
Fujii Sho,
Kitamura Noboru
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201700448
Subject(s) - chemistry , ruthenium , intramolecular force , excited state , photochemistry , aryl , phenanthroline , quantum yield , electrochemistry , boron , acetonitrile , ligand (biochemistry) , fluorescence , crystallography , catalysis , stereochemistry , atomic physics , electrode , organic chemistry , biochemistry , physics , alkyl , receptor , quantum mechanics
The starburst‐type arylborane‐appended polypyridyl Ru II complex [Ru{4,7‐bis({dimesityl}boryldurylethynyl)‐1,10‐phenanthroline} 3 ] 2+ ( 1 ) was synthesized, and its spectroscopic and photophysical properties were evaluated. In the excited state of the complex, intramolecular charge transfer (CT) between the π orbital of the aryl group and the vacant p orbital of the boron atom [π(aryl)–p(B) CT] interacts synergistically with metal‐to‐ligand charge transfer (MLCT). The synergistic CT interactions in 1 are more effective than those in previously reported arylborane‐appended polypyridyl Ru II complexes and lead to bright (molar absorption coefficient of the MLCT band = 7.2 × 10 4 m –1 cm –1 , emission quantum yield = 0.29) and long‐lived emission (8.7 µs) of 1 in CH 3 CN at 298 K. The unique emission characteristics of 1 are discussed in detail together with its electrochemical properties and time‐dependent DFT (TD‐DFT) calculations.