An anionic In(III)-based metal-organic framework with Lewis basic sites for the selective adsorption and separation of organic cationic dyes

In this paper, a new anionic metal-organic framework, [In(PBPTTBA)][(CH3)(2)NH2] (BUT-29) has been synthesized through the reaction of tetratopic acid ligand with double Lewis pyridine sites, 4,4',4 '',4'''-(4,4'-(1,4-phenylene)bis(pyridine-6,4,2-triyl)) tetrabenzoic acid (H(4)PBPTTBA) and In(NO3)(2) center dot 5H(2)O and fully characterized by single-crystal X-ray diffraction (SXRD), powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), infrared spectroscopy (IR), and elemental analysis (EA). BUT-29 can be used as an efficient adsorbent for the selective removal of organic cationic dyes in N,N'-dimethylformamide (DMF) solution. The adsorption capacities of BUT-29 toward methylene blue and crystal violet at 298 K can reach 1119 mg/g and 832 mgig, respectively. Moreover, the adsorbed dyes can be released in the DMF solution of LiNO3 gradually. (C) 2018 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.