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Electrochemical and Spectroscopic Properties of Cyclometallated and Non‐Cyclometallated Ruthenium(II) Complexes Containing Sterically Hindering Ligands of the Phenanthroline and Terpyridine Families
Author(s) -
Barigelletti Francesco,
Ventura Barbara,
Collin JeanPaul,
Kayhanian Robert,
Gaviña Pablo,
Sauvage JeanPierre
Publication year - 2000
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/(sici)1099-0682(200001)2000:1<113::aid-ejic113>3.0.co;2-9
Subject(s) - chemistry , terpyridine , ruthenium , steric effects , phenanthroline , electrochemistry , photochemistry , combinatorial chemistry , stereochemistry , metal , organic chemistry , catalysis , electrode
Abstract Two series of cyclometallated and noncyclometallated ruthenium(II) complexes incorporating mono‐ or disubstituted 1,10‐phenanthroline‐ and 2,2′:6′,2′′‐terpyridine‐type ligands have been synthesized and characterized. An X‐ray crystal structure for one of the complexes, Ru(ttpy)(mapH)‐(Cl)(PF 6 ), has been obtained (mapH = 2‐ p ‐anisyl‐1,10‐phenanthroline; ttpy = 4′‐tolyl‐2,2′:6′,2′′‐terpyridine). Distinct electrochemical and photophysical properties have been observed for the two series: a remarkable feature is the observation of relatively long‐lived MLCT excited states (from 70 to 106 ns at room temperature in CH 3 CN) for three of the cyclometallated complexes. A discussion is given on the role of factors like sigma donation by the cyclometallating ligands, interligand steric hindrance and interligand π‐π interactions that affect the electrochemical and spectroscopic properties.