Issue 50, 2002

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

Abstract

The organometallic cationic acid [CoIII5-C5H4COOH)2]+ (AC) is crystallised from hydrochloric acid solutions in two polymorphic modifications of the salt [CoIII5-C5H4COOH)2]Cl·H2O, ACCl·H2Ocube and ACCl·H2Osword. On the other hand, ACCl·H2Osword is isomorphous with the triply-hydrated zwitterion [CoIII5-C5H4COOH)(η5-C5H4COO)], ZW·3H2O. ACCl·H2Osword, ACCl·H2Ocube and ZW·3H2O are all converted into the anhydrous form [CoIII5-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).

Article information

Article type
Paper
Submitted
12 Feb 2002
Accepted
17 Apr 2002
First published
16 Jul 2002

CrystEngComm, 2002,4, 277-281

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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