Selective formation of five coordination polymer particles (CPPs) and their gas sorption properties

Abstract

A solvothermal approach based on In³⁺ and three organic linkers, 2,6-naphthalenedicarboxylic acid (H₂NDC), 4,4′-biphenyldicarboxylic acid (H₂BPDC) and 1,4-benzenedicarboxylic acid (H₂BDC), for the synthesis of five types of coordination polymer particles (CPPs) has been demonstrated. Five CPPs are selectively fabricated in rod, lump, ribbon, sphere and sea urchin shapes depending on the organic linkers used in the reactions. The simultaneous incorporation of two different organic linkers within a CPP in a specific ratio was verified when CPPs are synthesized from a mixture of two organic linkers. The porosity and specific gas sorption properties of five CPPs are evaluated via gas sorption measurements on N₂, CO₂ and H₂. Their porosity and specific gas sorption ability also vary depending on the linkers used in their fabrication process. While two CPPs synthesized using only one kind of organic linker are non-porous, three CPPs fabricated using the mixture of two different organic linkers are highly porous. Significant increases in the CO₂ and H₂ uptake abilities are also observed when CPPs are synthesized from two mixed linkers.