Ru(II), Os(II), and Ir(III) complexes with chelating pyridyl-mesoionic carbene ligands: structural characterization and applications in transfer hydrogenation catalysis

Chemistry : a European Journal
Aljoša BoljeBiprajit Sarkar

Abstract

Chelating ligands with one pyridine donor and one mesoionic carbene donor are fast establishing themselves as privileged ligands in homogeneous catalysis. The synthesis of several new Ir(III)-Cp*- and Os(II)-Cym complexes (Cp* = pentamethylcyclopentadienyl, Cym = p-cymene=4-isopropyl-toluene) derived from chelating pyridyltriazolylidenes where the additional pyridine donor was incorporated via the azide part of the triazole is presented. Furthermore, different 4-substituted phenylacetylene building blocks have been used to introduce electronic fine-tuning in the ligands. The ligands thus can be generally described as 4-(4-R-phenyl)-3-methyl-1-(pyridin-2-yl)-1H-1,2,3-triazol-5-ylidene (with R being H (L(1)), Me (L(2)), OMe (L(3)), CN (L(4)), CF3 (L(5)), Br (L(6)) or NO2 (L(7))). The corresponding complexes (Ir-1 to Ir-7 and Os-1 to Os-7) were characterized by standard spectroscopic methods, and the expected three-legged, piano-stool type coordination was unambiguously confirmed by X-ray diffraction analysis of selected compounds. Together with Ru(II) analogues previously reported by us, a total of 21 complexes were tested as (pre)catalysts for the transfer hydrogenation of carbonyl groups, showing a remarkable reactivity even at...Continue Reading

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Citations

Aug 3, 2016·Inorganic Chemistry·Andrea BaschieriLetizia Sambri
Oct 21, 2016·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·András PerczelJosef Jampílek
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Jun 25, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Satyendra KumarAjai K Singh
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Aug 13, 2015·Chemical Communications : Chem Comm·Ramananda MaityBiprajit Sarkar
Sep 3, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Marc BaltrunStephan Hohloch
Jan 10, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Karel ŠkochPetr Štěpnička
Apr 17, 2020·Physical Chemistry Chemical Physics : PCCP·Meiyuan GuoJens Uhlig
Aug 20, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Vivek Kumar SinghArnab Rit
Oct 1, 2015·Angewandte Chemie·Margarethe van der MeerBiprajit Sarkar
Apr 4, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ricardo Cerón-CamachoRonan Le Lagadec
Jun 11, 2015·Chemical Reviews·Dong Wang, Didier Astruc
Oct 1, 2021·Inorganic Chemistry·Florian R NeururerStephan Hohloch

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