Pillar[3]trianglamines: deeper cavity triangular macrocycles for selective hexene isomer separation

Abstract

Crystalline allyl-functionalized trianglamine macrocycles (P-TA) that show a pillared-like cavity were successfuly prepared and employed for the robust molecular sieving of 1-He from vapor and liquid (in solution) isomeric mixtures.

Unravelling Structural Dynamics, Supramolecular Behavior, and Chiroptical Properties of Enantiomerically Pure Macrocyclic Tertiary Ureas and Thioureas

“… 41 , 42 The selectivity toward specific molecules is a function of the size matching between the guest and the trianglamine host’s cavity, and in certain cases, the full separation of linear alkanes from linear and branched alkanes mixture has been achieved. 36 , 44 − 46 These results have been considered promising in terms of further industrial applications and are in line with the recently observed trend of searching for new, preferably chiral selectors of organic molecules with low molecular masses. 47 − 52 …”

“…Only recently, Chaix, He, , Dey, − Liu, Ding, and co-workers have proven the ability of macrocyclic chiral polyimines to selectively capture gases or to recognize and separate small organic molecules. − However, only little is known about the similar properties of the reduced counterparts of macrocyclic polyimines. This is apparently due to much higher structural dynamics of polyamines resulting in the adaptation of different conformations by the given macrocycle .…”

“…23 In some cases, the poor shape complementarities lead to obtaining the supramolecular organic frameworks (SOFs), characterized by intrinsic permanent porosity. 24−29 Only recently, Chaix, 30 He, 18,31 Dey, 32−34 Liu, 35 Ding, 36 and co-workers have proven the ability of macrocyclic chiral polyimines to selectively capture gases or to recognize and separate small organic molecules. 37−40 However, only little is known about the similar properties of the reduced counterparts of macrocyclic polyimines.…”

“…Only recently, Chaix, 30 He, 18 , 31 Dey, 32 − 34 Liu, 35 Ding, 36 and co-workers have proven the ability of macrocyclic chiral polyimines to selectively capture gases or to recognize and separate small organic molecules. 37 − 40 However, only little is known about the similar properties of the reduced counterparts of macrocyclic polyimines.…”

Supramolecular modification of a metal–organic framework increases sorption switching: insights into reversible structural deformation of ZIF-8

“…4 As non-spontaneous processes, chemical separations can be accomplished by selective adsorption of an adsorbate onto a given porous adsorbent based on its molecular shape, kinetic diameter, and supramolecular interactions with the adsorbent host. [4][5][6] The mechanical properties of porous adsorbents are crucial for determining performance and sustainability under a continuous uid stream. 4,7 In addition to desired mechanical properties, the adsorbent should have a high surface area and favorable adsorption kinetics in a broad pressure range.…”