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Issue 26, 2020
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Polymorphism and structural diversities of LiClO4–β-alanine ionic co-crystals

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Abstract

Three novel ionic co-crystals (ICCs) built from lithium perchlorate and β-alanine (LiClO4·βAla, LiClO4·2βAla-I, LiClO4·2βAla-II) were obtained and structurally characterized. Crystals with a twofold excess of amino acid, LiClO4·2βAla-I, were found to undergo a solvent-mediated phase transition, recrystallizing as the thermodynamically stable polymorph LiClO4·2βAla-II. The transition was characterized by a series of PXRD measurements, observations performed under a microscope with polarized light and DSC experiments. Both polymorphs were found to exhibit virtually the same square-grid topology of lithium–alanine coordination sheets, yet they differ in symmetry and geometrical parameters of the networks. In the LiClO4·βAla crystal structure, chain-like coordination polymers are formed. Responses to temperature change were determined for all three structures by performing a series of X-ray diffraction measurements in the 100–300 K range. Differences were elucidated with the help of a thermal tensor, which allowed us to identify the structural motifs most sensitive to temperature change.

Graphical abstract: Polymorphism and structural diversities of LiClO4–β-alanine ionic co-crystals

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Article information


Submitted
19 Apr 2020
Accepted
20 May 2020
First published
21 May 2020

This article is Open Access

CrystEngComm, 2020,22, 4427-4437
Article type
Paper

Polymorphism and structural diversities of LiClO4–β-alanine ionic co-crystals

P. H. Marek, G. Cichowicz, D. M. Osowicka, I. D. Madura, Ł. Dobrzycki, M. K. Cyrański and A. Ciesielski, CrystEngComm, 2020, 22, 4427
DOI: 10.1039/D0CE00592D

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