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Syntheses, structures, and properties of two mononuclear cobalt(III) azido complexes containing a tetradentate N-donor Schiff base as end-capping ligand

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Abstract

Two hexacoordinated mononuclear Co(III) compounds of the type cis-[Co(L)(N3)2] X [1, X = ClO4; 2, X = PF6; L = N,N′-(bis(pyridine-2-yl)benzylidine)-1,4-butanediamine] have been synthesized and characterized by physicochemical and spectroscopic methods. The crystal structures of complexes 1 and 2 both have distorted octahedral geometry with two terminal azides in mutual cis orientations. In the crystalline state, two mononuclear units of 1 are associated by weak C–H…π interactions to produce a dimeric unit, which packs through C–H…O hydrogen bonds and π…π interactions leading to a 2-D continuum. The mononuclear units in 2 are engaged in weak cooperative intermolecular C–H…π interactions and multiple C–H…F hydrogen bonds giving rise to a 3-D network structure. These diamagnetic compounds are redox active and show luminescence in DMF solutions.

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Acknowledgments

Financial supports from the DST and CSIR, New Delhi, India are gratefully acknowledged. S.K., K.B., and S.R. are grateful to CSIR and UGC, New Delhi, India for fellowship. The authors also acknowledge the use of DST-funded National Single Crystal X-ray Diffraction Facility at the Department of Inorganic Chemistry, IACS, Kolkata, India for crystallographic studies.

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Authors and Affiliations

  1. Department of Chemistry, The University of Burdwan, Burdwan, 713104, India

    Sumitava Khan, Subhasis Roy, Kishalay Bhar & Barindra Kumar Ghosh

  2. Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata, 700 032, India

    Partha Mitra

  3. Molecular Structure Laboratory, School of Chemistry, The University of St. Andrews, Purdie Building, St. Andrews, Fife, KY 16 9ST, UK

    Alexandra M. Z. Slawin

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  1. Sumitava Khan
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  2. Subhasis Roy
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  3. Kishalay Bhar
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  6. Barindra Kumar Ghosh
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Correspondence to Barindra Kumar Ghosh.

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Khan, S., Roy, S., Bhar, K. et al. Syntheses, structures, and properties of two mononuclear cobalt(III) azido complexes containing a tetradentate N-donor Schiff base as end-capping ligand. Transition Met Chem 36, 99–106 (2011). https://doi.org/10.1007/s11243-010-9440-4

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