Pressure-and temperature induced phase transitions, piezochromism, NLC behaviour and pressure controlled Jahn-Teller switching in a Cu-based framework

Charles J McMonagle; Priyanka Comar; Gary S Nichol; David R Allan; Jesús González; José A Barreda-Argüeso; Fernando Rodríguez; Rafael Valiente; Gemma F Turner; Euan K Brechin; Stephen A Moggach

doi:10.1039/d0sc03229h

Pressure-and temperature induced phase transitions, piezochromism, NLC behaviour and pressure controlled Jahn-Teller switching in a Cu-based framework

Chem Sci. 2020 Jul 30;11(33):8793-8799. doi: 10.1039/d0sc03229h.

Affiliations

¹ School of Chemistry and Centre for Science at Extreme Conditions, The University of Edinburgh, King's Buildings David Brewster Road Edinburgh Scotland EH9 3FJ UK.
² Diamond Light Source, Harwell Campus Didcot OX11 ODE UK.
³ MALTA Team, CITIMAC, Facultad de Ciencias, University of Cantabria 39005 Santander Spain.
⁴ Applied Physics Dept, Facultad de Cienicas, University of Cantabria - IDIVAL 39005 Santander Spain.
⁵ School of Molecular Sciences and Centre for Microscopy, Characterisation and Analysis, University of Western Australia 35 Stirling Highway, Crawley Perth 6005 Western Australia Australia stephen.moggach@uwa.edu.au.

Abstract

In situ single-crystal diffraction and spectroscopic techniques have been used to study a previously unreported Cu-framework bis[1-(4-pyridyl)butane-1,3-dione]copper(ii) (CuPyr-I). CuPyr-I was found to exhibit high-pressure and low-temperature phase transitions, piezochromism, negative linear compressibility, and a pressure induced Jahn-Teller switch, where the switching pressure was hydrostatic media dependent.