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Cu(I)···H–C Bonding in Cu(2,3-Diphenylquinoxaline)ClO4

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Abstract

Copper(II) perchlorate was comproportionated with copper metal in the presence of 2,3-diphenylquinoxaline (Ph2Qox) to produce two 1-D polymeric Cu(I) complexes, depending on reaction conditions used. Red complex 1, Cu(Ph2Qox)ClO4, crystallized in the monoclinic P21/n space group with cell parameters: a = 8.6254(4) Å, b = 17.4097(7) Å, c = 11.9174(5) Å, β = 103.3050(16), V = 1,741.55(13) Å3, and Z = 4. It contains a Cu–O perchlorate bond and shows a remarkably close interaction of C–H with Cu. The latter interaction is best described as a weak hydrogen bond between C–H and the metal center. In addition, weak hydrogen bonding is seen between the same C–H and two of the ClO4 oxygen atoms. Complex 2, [Cu(Ph2Qox)(H2O)]ClO4·0.5CH2Cl2, crystallizes as a racemic twin in the orthorhombic P21212 space group with cell parameters: a = 12.8184(10) Å, b = 17.5539(14) Å, c = 9.1166(7) Å, V = 2,051.4(3) Å3, and Z = 2. It contains non-coordinated perchlorate. Hydrogen bonding produces (H2O)2(ClO4)2 rings that bridge the polymer chains into sheets.

Graphical Abstract

Polymeric complexes of copper(I) perchlorate with 2,3-diphenylquinoxaline (Ph2Qox) Cu(Ph2Qox)ClO4 (1) and [Cu(Ph2Qox)(H2O)]ClO4·0.5CH2Cl2 (2) are reported. Complex 1 contains a remarkably close Cu···C–H interaction best described as a weak hydrogen bond.

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Acknowledgments

We gratefully acknowledge the National Science Foundation (CHE-0848109). X-ray equipment was obtained with support from the NSF (CHE-0443345) and the College of William and Mary.

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Authors and Affiliations

  1. Department of Chemistry, College of William and Mary, Williamsburg, VA, 23187-8795, USA

    Robert D. Pike, Gerardo Ayala & Alba P. Evans

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  1. Robert D. Pike
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  2. Gerardo Ayala
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  3. Alba P. Evans
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Correspondence to Robert D. Pike.

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Pike, R.D., Ayala, G. & Evans, A.P. Cu(I)···H–C Bonding in Cu(2,3-Diphenylquinoxaline)ClO4 . J Chem Crystallogr 44, 520–526 (2014). https://doi.org/10.1007/s10870-014-0545-z

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  • DOI: https://doi.org/10.1007/s10870-014-0545-z

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