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Half-sandwich pentamethylcyclopentadienyl group 9 metal complexes of 2-aminopyridyl ligands: Synthesis, spectral and molecular study

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Abstract

The reaction of [Cp*M(µ-Cl)Cl]2 (M = Rh, Ir) with 2-aminopyridyl based ligands lead to the formation of mononuclear neutral complexes of general formula [Cp*MCl2(L)] {where L1 = 2-aminopyridine, L2 = 2-amino-3-picoline, L3 = 2-amino-3-nirtopyridine, and L4 = 2-amino-3-pyridine carboxyaldehyde}. The complexes have been characterized by FT-IR, UV-Vis, 1H-13C NMR and mass spectroscopic methods. X-ray crystallographic studies of the complexes have shown typical piano-stool geometry around the metal centre in which 2-aminopyridyl ligand acts as an N-monodentate ligand and the amino functionality is not involved in metal coordination. The intra/intermolecular arrangement is due to hydrogen bonding.

A new series of pentamethylcyclopentadienyl rhodium/iridium complexes with 2-aminopyridyl ligands have been synthesized and characterized by spectral studies. The complexes have shown that piano-stool geometry around the metal center in which 2-aminopyridyl ligand acts as an N-mono-dentate ligand and the amino functionality is never involved in metal coordination.

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Acknowledgements

Mahesh K thanks University Grants Commission (UGC) ,New Delhi for providing financial assistance in the form of University Fellowship (UGC-RFSMS). K. M. Rao gratefully acknowledges financial support from Council of Scientific and Industrial Research (CSIR) New Delhi, through the Research grants No. 01(2493)/11/EMR-II.

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Authors and Affiliations

  1. Department of Chemistry, North Eastern Hill University, Shillong, 793 022, India

    MAHESH KALIDASAN & MOHAN RAO KOLLIPARA

  2. Department of Chemistry and Chemical Biology, McMaster University, Hamilton, L8S 4M1, Canada

    SCOTT FORBES & YURIJ MOZHARIVSKYJ

Authors
  1. MAHESH KALIDASAN
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  2. SCOTT FORBES
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  3. YURIJ MOZHARIVSKYJ
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  4. MOHAN RAO KOLLIPARA
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Correspondence to YURIJ MOZHARIVSKYJ or MOHAN RAO KOLLIPARA.

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Supplementary Information

CCDC numbers 1018330 (3), 101831 (4), 1018332 (5), 1018333 (6), 1018334 (7), 1018335 (8) contain the supplementary crystallographic data for the compounds. These data can be obtained free of charge via 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.

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KALIDASAN, M., FORBES, S., MOZHARIVSKYJ, Y. et al. Half-sandwich pentamethylcyclopentadienyl group 9 metal complexes of 2-aminopyridyl ligands: Synthesis, spectral and molecular study. J Chem Sci 127, 1135–1144 (2015). https://doi.org/10.1007/s12039-015-0846-6

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  • DOI: https://doi.org/10.1007/s12039-015-0846-6

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