Steric influence on the excited-state lifetimes of ruthenium complexes with bipyridyl-alkanylene-pyridyl ligands

Inorganic Chemistry
Maria AbrahamssonPetter Persson

Abstract

The structural effect on the metal-to-ligand charge transfer (MLCT) excited-state lifetime has been investigated in bis-tridentate Ru(II)-polypyridyl complexes based on the terpyridine-like ligands [6-(2,2'-bipyridyl)](2-pyridyl)methane ( 1) and 2-[6-(2,2'-bipyridyl)]-2-(2-pyridyl)propane ( 2). A homoleptic ([Ru( 2) 2] (2+)) and a heteroleptic complex ([Ru(ttpy)( 2)] (2+)) based on the new ligand 2 have been prepared and their photophysical and structural properties studied experimentally and theoretically and compared to the results for the previously reported [Ru( 1) 2] (2+). The excited-state lifetime of the homoleptic Ru (II) complex with the isopropylene-bridged ligand 2 was found to be 50 times shorter than that of the corresponding homoleptic Ru (II) complex of ligand 1, containing a methylene bridge. A comparison of the ground-state geometries of the two homoleptic complexes shows that steric interactions involving the isopropylene bridges make the coordination to the central Ru (II) ion less octahedral in [Ru( 2) 2] (2+) than in [Ru( 1) 2] (2+). Calculations indicate that the structural differences in these complexes influence their ligand field splittings as well as the relative stabilities of the triplet metal-to-lig...Continue Reading

Citations

Sep 8, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Chu-Yun KueiYun Chi
Jun 21, 2018·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Yafei LuoWei Shen
Nov 22, 2018·Journal of Molecular Modeling·Srikanth MalladiG Narahari Sastry
Oct 20, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Isabelle M DixonJean-Louis Heully
Apr 25, 2019·Faraday Discussions·Pavel CháberaPetter Persson
Aug 15, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Yanling SiZhijian Wu
Aug 2, 2019·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Ancong ZhaoWei Shen
Mar 16, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Behrouz NotashMarzieh Zare Dehnavi
Aug 2, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Holly van der SalmKeith C Gordon
Oct 31, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Yafei LuoWei Shen
Aug 12, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Maria AbrahamssonLeif Hammarström
Nov 14, 2008·Journal of the American Chemical Society·Maria AbrahamssonLeif Hammarström
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