Snap frozen! Capturing two metastable polymorphs in a tetramorphic one-dimensional coordination polymer constructed from cadmium, dithiophosphate, and 4-pyridinealdazine

Tan, Yee Seng * and Otero-de-la-Roza, Alberto and Jotani, Mukesh M. and Tiekink, Edward R. T. * (2020) Snap frozen! Capturing two metastable polymorphs in a tetramorphic one-dimensional coordination polymer constructed from cadmium, dithiophosphate, and 4-pyridinealdazine. Crystal Growth & Design, 20 (5). pp. 3272-3283. ISSN 1528-7483

[img] Text
Tiekink Cryst Growth Des 2020 20 3272.pdf - Published Version
Restricted to Repository staff only until 24 March 2021.
Available under License Creative Commons Attribution Non-commercial.

Download (2MB) | Request a copy
Official URL: http://doi.org/10.1021/acs.cgd.0c00082

Abstract

Four polymorphs are described for the one-dimensional coordination polymer {Cd[S2P(OMe)2]2(4-pyridine-aldazine)}n (1) which features a trans-N2S4 distorted octahedral coordination geometry. Lattice energy calculations show the room temperature form, 1α, is the thermodynamically stable phase, being 1.52 kcal/mol more stable than the 1β form per unit formula. The latter is formed at 233 K on cooling 1α based on single crystal data. Single crystals of forms 1α and 1β exhibit a reversible single-crystal-single-crystal phase change which also 2 occurs in the bulk form as seen in DSC and PXRD experiments. When 1 was “snap frozen” at 100 K under a cold stream, 1β was observed most of the time but sometimes forms 1γ and 1δ were found. When warmed, 1β converted to 1α by 293 K, and each of 1γ and 1δ first converted to 1β (120-130 and 140-150 K, respectively) and then to 1α (280 K), correlating with the calculated lattice energies; subsequent cooling only yielded 1β, indicating 1γ and 1δ are metastable forms. The polymorphs exhibit different molecular packing patterns based on different non-covalent interactions and these have been evaluated by Hirshfeld surface analyses and NCI plots.

Item Type: Article
Subjects: Q Science > QD Chemistry
Divisions: Others > Non Sunway Academics
Sunway University > School of Science and Technology > Research Centre for Crystalline Materials
Depositing User: Dr Janaki Sinnasamy
Related URLs:
Date Deposited: 13 May 2020 07:58
Last Modified: 13 May 2020 07:58
URI: http://eprints.sunway.edu.my/id/eprint/1278

Actions (login required)

View Item View Item