Crystallization from hydrochloric acid affords the solid-state structure of croconic acid (175 years after its discovery) and a novel hydrogen-bonded network

Dario Braga; Lucia Maini; Fabrizia Grepioni

doi:10.1039/B100020I

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Dario Braga,*^a Lucia Maini^a and Fabrizia Grepioni*^b

Author affiliations

* Corresponding authors

^a Dipartimento di Chimica G. Ciamician, Via F. Selmi 2, Università di Bologna, Bologna, Italy
E-mail: dbraga@ciam.unibo.it
Web: http://ciamserv.ciam.unibo.it

^b Dipartimento di Chimica, Via Vienna 2, Università di Sassari, Sassari, Italy
E-mail: grepioni@ssmain.uniss.it

Abstract

The structure of croconic acid is determined on single crystals grown from a solution of HCl 1 M; it is shown that O–H⋯O interactions organize the H₂C₅O₅ molecules in an ‘accordion’ type supramolecular arrangement of hydrogen-bonded molecules; the stacking of [Cl]⁻·H₂C₅O₅ units in the organometallic co-crystal [(η⁵-C₅H₅)₂Co][Cl]·H₂C₅O₅ is also analysed.

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Article information

DOI: https://doi.org/10.1039/B100020I
Article type: Paper
Submitted: 02 Jan 2001
Accepted: 11 Jan 2001

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CrystEngComm, 2001,3, 27-29

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