Solid-Liquid Conversion and Carbon Dioxide Storage in a Calcium-Based Metal-Organic Framework with Micro- and Nanoporous Channels

A new Ca-MOF with the chemical formula of [Ca(NO2-BDC)center dot DMF](n) (MUT-1; NO2-BDC2- = 2-nitroterephthalate) with 5,5T4 topology and the Schafli symbol of (4(8).6(2))(4(5).6(5)) was synthesized and structurally characterized with FT-IR, PXRD, BET, TG-DTA, and single-crystal X-ray techniques. MUT-1 has 1D channels along the crystallographic c axis. Its 1D channels have microporosity before the activation process, and its nanoporous structure can be achieved with the activation process. ID channels of MUT-1 are surrounded by -NO2 groups, which indicate that this MOF could be a good candidate for CO2 storage. It shows 0.97 mmol g(-1) of CO2 adsorption at 298 K up to 1 bar pressure. The structural stability of MUT-1 in various solvents was investigated, and a new phase after subsequent exposure to water and DMF was characterized.