Synthesis and characterization of lanthanide MOFs based on 2,2′-bipyridine-5,5′-dicarboxylate linkers

Two new metal-organic frameworks based on 2,2′-bipyridine-5,5′-dicarboxylate and lanthanide (Ln) metal ions were prepared under solvothermal conditions, using HCl as a modulator. JMS-8 and JMS-9 MOFs ([Ln(bpdc) 3 (dmf)(H 2 O) 3· 5dmf·1.5H 2 O] n ) crystallised in a triclinic system with space group P <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <m:mrow> <m:mover accent="true"> <m:mn>1</m:mn> <m:mo>̅</m:mo> </m:mover> </m:mrow> </m:math> ̅1 . The MOFs have rod SBUs that grow along the b -axis. The linkers connect the SBUs along the a -axis and c -axis giving a 3D network structure. The packing diagrams show large pores as viewed on the a -axis and smaller pores which can be viewed on the c -axis. The MOFs exhibit good thermal and chemical stability. Gas sorption studies revealed low surface areas and poor CO 2 adsorption capacity.