Abstract
In high-pressure structural chemistry, recrystallization techniques have been shown to be a powerful way of generating new polymorphs and solvates. A recent study by Olejniczak et al. [IUCrJ (2022), 9, 49-54] on the pyridazine-based compound 6-chloro-1,2,3,4-tetrazolo[1,5-b]pyridazine (C4H2N5Cl or CTP) uses these solvothermal techniques to establish the phase behaviour of CTP and the effects of partial hydration.
Highlights
The development of apparatus to maintain materials at high hydrostatic pressure has been an active area of research for many years with some of the earliest pioneering work conducted by Bridgman (Bridgman, 1941) using piston-cylinder devices with designs evolving to massive hydraulically driven Bridgman-anvil and, latterly, multi-anvil presses
The material is an example of a high-nitrogen-content organic compound and these systems have a comparatively high density but, are not observed to have the expected relatively short intermolecular contacts within their crystal structures
In the Earth and planetary sciences, high-pressure and variabletemperature studies provide a means of uncovering phenomena that are otherwise not directly observable but are, of crucial importance for an understanding of geological processes at extreme depths
Summary
The development of apparatus to maintain materials at high hydrostatic pressure has been an active area of research for many years with some of the earliest pioneering work conducted by Bridgman (Bridgman, 1941) using piston-cylinder devices with designs evolving to massive hydraulically driven Bridgman-anvil and, latterly, multi-anvil presses. In this issue of IUCrJ, Olejniczak et al (2022) describe a study of the pyridazine-based compound 6-chloro-1,2,3,4-tetrazolo[1,5-b]pyridazine (C4H2N5Cl or CTP) to establish its structural and phase behaviour at pressure and temperature.
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