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Synthesis and Characterization of Two New Mononuclear Complexes of Cobalt(II) with 7-Azaindole

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Abstract

Two new complexes of cobalt(II) with 7-azaindole have been synthesized, and characterized by elemental analysis and FTIR spectroscopy, [(C2H5)3NH][Co(Haza)Cl3] 1, (where Haza = 7-azaindole), and [Co(Haza)2Cl2], 2. The crystal structures for 1 and 2 were determined by X-ray diffraction analysis. [(C2H5)3NH][Co(Haza)Cl3], 1, is monoclinic and crystallizes in the space group P2 1 /n with a = 12.9997 (2), b = 9.87449 (13), c = 13.9488 (2) Å, β = 104.0180 17)°. [Co(Haza)2Cl2], 2. is also monoclinic and crystallizes in the space group P2 1 /c with a = 12.453 (3), b = 9.3753 (18), c = 13.136 (3) Å, β = 98.728 (4). In both complexes the bonding to the Haza is via the pyridine N (N7), where the Haza is a neutral ligand, and the environment around the Co ions is distorted tetrahedral. Hydrogen bonding between the N1–H and Cl is present in 1 and 2, and determines the head to head alignment of the two Haza with respect to each other in 2. Additional hydrogen bonding links the cation and anion together in 1. FTIR confirms the presence of the neutral Haza in the both materials.

Graphical Abstract

Two complexes of the 7-azaindole ligand with Co(II) are reported. Hydrogen bonding in [(C2H5)3NH][Co(Haza)Cl3], including a bifurcated H-bond from N3–H to Cl2 and Cl3 is shown.

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Acknowledgements

The authors thank the Welch Foundation (AX-0026) and The University of Texas at San Antonio for support of this research.

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Authors and Affiliations

  1. Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-0698, USA

    Jacob A. Przyojski, Hadi D. Arman, Nicole N. Myers & Judith A. Walmsley

  2. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    Jacob A. Przyojski

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  1. Jacob A. Przyojski
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  2. Hadi D. Arman
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  3. Nicole N. Myers
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  4. Judith A. Walmsley
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Correspondence to Judith A. Walmsley.

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Przyojski, J.A., Arman, H.D., Myers, N.N. et al. Synthesis and Characterization of Two New Mononuclear Complexes of Cobalt(II) with 7-Azaindole. J Chem Crystallogr 47, 22–29 (2017). https://doi.org/10.1007/s10870-017-0676-0

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