MIL-53(Sc) (Materials of Institut Lavoisier) is a metal organic framework (MOF) made up of scandium and oxygen (ScO6) with 1,4-benzodicarboxylic acid between the nodes.
This is a flexible MOF which changes pore size and shape upon heating and adsorption of CO2. The structures were calculated using DFT.
L. Chen, J. P. S. Mowat, D. Fairen-Jimenez, C. A. Morrison, S. P. Thompson, P. A. Wright, T. Düren, J. Am. Chem. Soc., 2013, 135 (42), pp 15763–15773