Issue 50, 2002
From the journal:

CrystEngComm

Two concomitant polymorphs and two isomorphous forms with different chemical compositions, which transform into the same substance upon thermal treatment†

Dario Braga,*a   Gianna Cojazzi,b   Dario Emiliani,a   Lucia Maini,a   Marco Polito,a   Roberto Gobettoc  and  Fabrizia Grepioni*d  

* Corresponding authors

a Dipartimento di Chimica G. Ciamician, Università di Bologna, Via Selmi 2, Bologna, Italy
E-mail: dbraga@ciam.unibo.it

b Centro CNR per la Fisica delle Macromolecole c/o Dipartimento di Chimica G. Ciamician, Università di Bologna, Via Selmi 2, Bologna, Italy

c Dipartimento di Chimica I.F.M., Università di Torino, Via P. Giuria 7, Torino, Italy

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

Abstract

The organometallic cationic acid [CoIII(η5-C5H4COOH)2]+ (AC) is crystallised from hydrochloric acid solutions in two polymorphic modifications of the salt [CoIII(η5-C5H4COOH)2]Cl·H2O, ACCl·H2Ocube and ACCl·H2Osword. On the other hand, ACCl·H2Osword is isomorphous with the triply-hydrated zwitterion [CoIII(η5-C5H4COOH)(η5-C5H4COO)], ZW·3H2O. ACCl·H2Osword, ACCl·H2Ocube and ZW·3H2O are all converted into the anhydrous form [CoIII(η5-C5H4COOH)(η5-C5H4COO)], ZW, upon thermal treatment. The structural relationship between the ionic and neutral systems and their interconversion have been investigated with a combination of solid-state techniques (single crystal and powder X-ray diffraction, thermogravimetric analysis, mass spectrometry and solid state 13C CP/MAS NMR).

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Article information

DOI
https://doi.org/10.1039/B201547A
Article type
Paper
Submitted
12 Feb 2002
Accepted
17 Apr 2002
First published
16 Jul 2002

CrystEngComm, 2002,4, 277-281

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Two concomitant polymorphs and two isomorphous forms with different chemical compositions, which transform into the same substance upon thermal treatment

D. Braga, G. Cojazzi, D. Emiliani, L. Maini, M. Polito, R. Gobetto and F. Grepioni, CrystEngComm, 2002, 4, 277 DOI: 10.1039/B201547A

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