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Ruthenium(II) Complexes Having a Pincer‐Type Ligand with Two N ‐Heterocyclic Carbene Moieties
Author(s) -
Shimoyama Yoshihiro,
Ishizuka Tomoya,
Kotani Hiroaki,
Kojima Takahiko
Publication year - 2018
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201800104
Subject(s) - carbene , chemistry , intramolecular force , ligand (biochemistry) , methylene , redox , isopropyl , ruthenium , pincer movement , electron paramagnetic resonance , photochemistry , medicinal chemistry , pincer ligand , stereochemistry , catalysis , organic chemistry , receptor , biochemistry , physics , nuclear magnetic resonance
Two novel Ru II complexes, having 2,2′‐bipyridyl and a pincer‐type methylene‐bridged N ‐heterocyclic carbene (NHC) ligand, were synthesized and characterized to evaluate the effects of structural features of the complexes on their redox and photochemical properties. The methylene‐bridged NHC ligand coordinated in a meridional manner and the isopropyl groups on the NHC rings exhibited intramolecular CH/π interaction with the 2,2′‐bipyridyl ligand, which played a role to strongly maintain the distorted ligand structure. In addition, the two Ru complexes exhibited reversible redox waves in the cyclic voltammograms and they were oxidized by an electron‐transfer oxidant to afford Ru III complexes, which were characterized by EPR spectroscopy and theoretical analyses.