Naslov
Reversible Temperature-Stimulated Single- Crystal-to-Single-Crystal Conformational Polymorph Transformation in Cadmium(II) Coordination Trimer with a Water Vapor Sorption/Desorption Potential

Autori
Pisačić, Mateja ; Kodrin, Ivan ; Matijaković, Nives ; Chatterjee, Nabanita ; Oliver, Clive L. ; Kukovec, Boris-Marko ; Đaković, Marijana

Izvornik
Crystal growth & design (1528-7483) 20 (2020); 401-413

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
single-crystal-to-single-crystal transformation ; conformational polymorph ; cadmium(II) trimer ; pyridine-4-propanamide ; water sorption/desorption

Sažetak
A crystalline cadmium(II) coordination trimer with pyridine-4-propanamide (4-propy), [Cd3Cl4(H2O)4(4-propy)6](CH3CH2COO)2, readily responds to external stimuli while preserving crystal integrity. Two polymorphic forms, Polymorph-I (triclinic form) and Polymorph-II (monoclinic form), undergo a reversible single- crystal-to-single-crystal conformational polymorph transformation upon temperature change, while the triclinic form (Polymorph-I) additionally shows substantial reversible sorption/desorption potential via two pathways, in response to stimulation by (i) elevated temperature, and (ii) reduced pressure. The elucidation of the conformational transformation via a variety of ex situ and in situ methods (SCXRD, VT-PXRD, TG/DSC and VT- IR), complemented by in-depth theoretical studies, suggested that the conformational transformation might be a process that occurs slowly and continuously over a wider temperature range, with different processes (distinctive conformational changes) taking place over different temperature intervals.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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