Our current material platform is the large family of coordination polymers, where our main interest is centered around their stimuli responsive behaviour, i.e. their crystal chemistry as a function of temperature and pressure variation. This includes both dense coordination networks with an ABX3 perovskite-type structure, so-called perovskite coordination networks (PCNs), and porous coordination networks known as metal-organic frameworks (MOFs), see Figure 1. Taken together, both material families offer synthetic chemists a fascinating playground for creating new chemistries and physics and for systematically studying composition-structure-property relations. In on-going research projects we explore and rationalise the stimuli responsive behaviour of PCNs and MOFs such as their structural response to temperature and pressure variation, with potential application ranging from sensors to new working media as barocalorics.
Figure 1. Schematic of two different PCNs, [dippl]Mn(Au(CN)2)3 (left, top) and [(C3H7)3(CH3)N]Mn(C2N3)3 (left, bottom), and a schematic presentation of the iconic metal-organic framework Cu3btc2 (right), with dippl+ = 4,5-Dihydro-1,3-bis(2,6-diisopropylphenyl)imidazolium and btc3- = 1,3,5-tricarboxylate.
- C. Schneider, D. Bodesheim, J. Keupp, R. Schmid, G. Kieslich. Retrofitting metal-organic frameworks, Nat. Commun. 2019, 10, 4921.
- K. T. Butler, P. Vervoorts, M. G. Ehrenreich, J. Armstrong, J. M. Skelton, G. Kieslich. Experimental Evidence for Vibrational Entropy as Driving Parameter of Flexibility in the Metal-Organic Framework ZIF-4(Zn). Chem. Mater. 2019, 31, 8366-8372.