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Synthesis, Spectroscopic and Computational Studies of Rhodium(III) Complexes Bearing N‐Heterocyclic Carbene‐Based C ^ N ^ C Pincer Ligand and Bipyridine/Terpyridine
Author(s) -
Io KaiWa,
Ng SzeWing,
Yeung ChiFung,
Wong ChunYuen
Publication year - 2020
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.202000411
Subject(s) - chemistry , pincer movement , carbene , rhodium , pyridine , pincer ligand , terpyridine , ligand (biochemistry) , bipyridine , medicinal chemistry , stereochemistry , crystallography , catalysis , crystal structure , organic chemistry , metal , biochemistry , receptor
Rhodium(III) complexes containing tridentate N‐heterocyclic carbene (NHC)‐based pincer ligand in the form of [Rh(C ^ N ^ C)(N ^ N)X] 2+ and [Rh(C ^ N ^ C)(tpy)] 3+ (C ^ N ^ C = (2,6‐bis(1‐butylimidazol‐2‐ylidene)pyridine (C 1 ^ N ^ C 1 ) or 2,6‐bis(3‐butylbenzimidazol‐2‐ylidene)pyridine (C 2 ^ N ^ C 2 ); N ^ N = bipyridine‐type aromatic diimines; tpy = 2,2':6',2''‐terpyridine; X = Cl or Br) were prepared. Spectroscopic comparisons and time‐dependent density functional theory (TD‐DFT) calculations revealed the lowest‐energy electronic transition associated with these complexes are different from their Ru(II), Os(II) and Ir(III) analogues. The Rh(III) complexes exhibit luminescent behavior at 77 K upon photoexcitation. The impact of the C ^ N ^ C pincer ligands on the photophysics of the Rh(III) complexes was investigated.