A flexible interpenetrating coordination framework with a bimodal porous functionality

Abstract

Introducing a functional part into open-framework materials that tunes the pore size/shape and overall porous activity will open new routes in framework engineering and in the fabrication of new materials. We have designed and synthesized a bimodal microporous twofold interpenetrating network {[Ni(bpe)2(N(CN)2)](N(CN)2)(5H2O)}n (1), with two types of channel for anionic N(CN)2- (dicyanamide) and neutral water molecules, respectively. The dehydrated framework provides a dual function of specific anion exchange of free N(CN)2- for the smaller N3- anions and selective gas sorption. The N3-exchanged framework leads to a dislocation of the mutual positions of the two interpenetrating frameworks, resulting in an increase in the effective pore size in one of the counterparts of the channels and a higher accommodation of adsorbate than in the as-synthesized framework (1), showing the first case of controlled sorption properties in flexible porous frameworks.

SCOPE OF VARIOUS SOLVENTS AND THEIR EFFECTS ON SOLVOTHERMAL SYNTHESIS OF Ni-BTC

“…These have wide potential applications in the fields of gas adsorption and storage, separation, sensors and catalysis. [1][2][3][4][5][6] These crystalline, highly porous solids can possess ultra--high Brunauer-Emmett-Teller (BET) surface areas (~7000 m 2 g -1…”

Modeling adsorption equilibria of xylene isomers in a microporous metal–organic framework

“…Contrasting to zeolites, which have pores confined by tetrahedral oxide skeletons, the pores within MOFs can be systematically varied by the judicious choice of the metal-containing and/or organic ligands [19]. Due to their unusual features, MOFs are considered promising materials for gas storage, adsorption separations and catalysis [20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Crystallography of Representative MOFs Based on Pillared Cyanonickelate (PICNIC) Architecture

“…Many PICNICs exhibit hysteretic adsorption-desorption behavior which is often associated with the 'gate-opening' effect ( Figure 4). They also show dynamic host-guest behavior due to structural transitions which occur between the guest-free and guest-loaded states [78][79][80][81][82].…”