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Crystal structure of quinoline-2-carboxylic acid ⋅ quinolinium-2-carboxylate

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Abstract

Quinoline-2-carboxylic acid (quinaldic acid), C10H7NO2, crystallizes in the monoclinic space group P21/c, a =9.724(1) Å, b = 5.937(1) Å, c = 27.545(2) Å, β = 90.15(1)°, z = 4, and occurs in the crystal in two tautomeric forms: the neutral molecule and the zwitterion, with molecular ratio 1:1. The compound can be named quinoline-2-carboxylic acid ⋅ quinolinium-2-carboxylate. The crystal structure is built up of tautomeric pairs consisting of C9H6NCOOH and C9H6NH+COO− moieties, held up together by hydrogen bonds.

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Authors and Affiliations

  1. Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Wrocław University of Technology, Wybrzeze Wyspiańskiego 27, 50-370, Wrocław, Poland

    Danuta Dobrzyńska

  2. Faculty of Chemistry, University of Wrocław, Joliot-Curie, Wrocław, Poland

    Lucjan B. Jerzykiewicz

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  1. Danuta Dobrzyńska
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  2. Lucjan B. Jerzykiewicz
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Correspondence to Danuta Dobrzyńska.

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Dobrzyńska, D., Jerzykiewicz, L.B. Crystal structure of quinoline-2-carboxylic acid ⋅ quinolinium-2-carboxylate. Journal of Chemical Crystallography 34, 51–55 (2004). https://doi.org/10.1023/B:JOCC.0000014688.79954.ca

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