Microwave-assisted solvothermal synthesis and optical properties of tagged MIL-140A metal-organic frameworks

A series of tagged MIL-140A-R frameworks have been synthesized using a microwave-assisted solvothermal method. Compared with their UiO-66-R polymorphs, the absorption energies in the MIL-140A-R series (R = NH2, NO 2, Br, Cl, and F) are extended toward the visible region because of the spatial arrangement of the linkers.