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Half-sandwich ruthenium, rhodium and iridium complexes of triazolopyridine ligand: Synthesis and structural studies

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Abstract

Triazolopyridine ligand, {3-(2-pyridyl)-[1,2,3]triazolo[1,5-a]-pyridine}, L was synthesized by reaction of p-toulenesulphonyl hydrazine and dipyridyl ketone in the presence of acetic acid. Half-sandwich ruthenium, rhodium and iridium complexes [1–4] have been synthesized by reaction of [{(arene)MCl 2} 2] (arene = p-cymene/benzene/Cp* and M = Ru/Rh/Ir) with ligand L in methanol. The reaction in 1:2 (M:L) ratio has yielded all mononuclear cationic complexes such as [(arene)ML\(\kappa ^{2}_{\mathrm {N\cap N}}\)Cl]PF 6, where {(arene)M} = (p-cym)Ru (1), (benz)Ru (2), Cp*Rh (3) and Cp*Ir (4). All the complexes were characterized by spectral studies and the solid state structures of complexes, 1 and 3 were unambiguously determined by crystallographic studies.

Triazolopyridine ligand, {3-(2-pyridyl)-[1,2,3]triazolo[1,5-a]-pyridine} L was synthesized by reaction of p-toulenesulphonyl hydrazine and dipyridyl ketone in the presence of acetic acid. Half-sandwich ruthenium, rhodium and iridium complexes [1-4] were synthesized by reaction of [{(arene)MCl2}2] (arene = p-cymene/benzene/Cp* and M = Ru/Rh/Ir) with ligand L in methanol. All the complexes were characterized by spectral studies and the solid state structures of two complexes were unambiguously determined by crystallographic studies.

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Acknowledgements

P N Rao thanks, UGC, New Delhi for providing fellowship in the form of SRF. Authors thank DST-PURSE SCXRD, Department of Chemistry, NEHU for X-ray analysis data. Authors thank Mr. B. Adinarayana (NISER-B) and M. Srinivasa Rao (IITG) for their support in NMR and mass analyses.

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  1. Centre for Advanced Studies in Chemistry, North-Eastern Hill University, Shillong, Meghalaya, 793 022, India

    NARASINGA RAO PALEPU & MOHAN RAO KOLLIPARA

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  1. NARASINGA RAO PALEPU
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Correspondence to MOHAN RAO KOLLIPARA.

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Supplementary Information (SI)

CCDC [1505760] and CCDC [1505761] contain the supplementary crystallographic data for complexes 1 and 3. These data can be obtained free of charge via http://www.ccdc.cam.ac.uk/data_request/cif http://www.ccdc.cam.ac.uk/data_request/cif, by e-mailing mailto:data_request@ccdc.cam.ac.uk,or by contacting The Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: + 44 1223 336033. 1H NMR and mass spectra of the corresponding complexes are given in the Supplementary Information, which is available at http://www.ias.ac.in/chemsci.

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PALEPU, N.R., KOLLIPARA, M.R. Half-sandwich ruthenium, rhodium and iridium complexes of triazolopyridine ligand: Synthesis and structural studies. J Chem Sci 129, 177–184 (2017). https://doi.org/10.1007/s12039-016-1216-8

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  • DOI: https://doi.org/10.1007/s12039-016-1216-8

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