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Crystal Structures of Thiophene-2-carboxamide Transition Metal Ion Complexes

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Abstract

The single-crystal X-ray structures of the hexacoordinate Co(II), Ni(II), and Mn(II) complexes of thiophene-2-carboxamide are reported as the perchlorate salts. The Co(II) and Ni(II) complexes are isostructural and crystallize in a cubic habit which is not frequently observed for complexes of metal ions with organic ligands (Pa\(\overline 3\), Z = 4, Co complex, 2, a = 16.466(2) Å, Ni complex, 3, a = 16.430(2) Å). The Mn(II) complex, 4, is monoclinic and contains four t-butanol molecules in the unit cell (P21/n, Z = 2, a = 9.7796(4) Å, b = 11.4847(4) Å, c = 23.3062(9) Å, β = 93.504(1)°). Hydrogen-bonding is a significant factor in all of these substances, especially for the Mn(II) complex. The structures and the infrared spectra of the compounds are discussed.

Graphical Abstract

Ellipsoid plots of the ions Co(C3H5NOS)6 2+ and Mn(C3H5NOS)6 2+

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Acknowledgements

Support by the Camille and Henry Dreyfus Senior Scientist Mentor Program is gratefully acknowledged. The WFU X-ray Facility thanks the National Science Foundation (Grant CHE-0234489) for funds to purchase the X-ray instrument and computers.

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Authors and Affiliations

  1. Department of Chemistry, Wake Forest University, Winston-Salem, NC, 27109, USA

    Rosalva C. Garcia, Cynthia S. Day & Ronald E. Noftle

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  1. Rosalva C. Garcia
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  2. Cynthia S. Day
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  3. Ronald E. Noftle
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Correspondence to Ronald E. Noftle.

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Garcia, R.C., Day, C.S. & Noftle, R.E. Crystal Structures of Thiophene-2-carboxamide Transition Metal Ion Complexes. J Chem Crystallogr 47, 110–119 (2017). https://doi.org/10.1007/s10870-017-0686-y

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