Unblocking a rigid purine MOF for kinetic separation of xylenes

Abstract

The separation of xylene isomers still remains an industrially challenging task. Here, porous purine-based metal-organic frameworks (MOFs) have been synthesized and studied for their potential in xylene separations. In particular,...

Recognition, detection and host–guest chemistry of hydrogen peroxide in a fluorescent metal–organic framework with chiral helical channels

“…Inspired by a previously reported purine-based MOF, 21,27 we optimized the synthesis conditions and obtained another Zn(pur)(OAc) MOF, named HSTC-2 . HSTC-2 crystallizes in a tetragonal crystal system with a space group of I 4̄ and possesses a square one-dimensional channel running along the c -axis with opening dimensions of ca.…”

“…The above experimental results indicate that the mechanism of HSTC-1 luminescence quenching in the presence of H 2 O 2 may be ascribed to the synergistic effect of the transformation of the framework, competitive absorption and the host-guest and guest-guest interactions. 23 Inspired by a previously reported purine-based MOF, 21,27 we optimized the synthesis conditions and obtained another Zn ( pur)(OAc) MOF, named HSTC-2. HSTC-2 crystallizes in a tetragonal crystal system with a space group of I4 ˉand possesses a square one-dimensional channel running along the c-axis with opening dimensions of ca.…”

“…The utilization of biomolecular linkers [13][14][15][16][17] can enhance the recognition capability of MOFs, and the diversity in the size and shape of channels within MOFs endows them with unique properties. [18][19][20][21][22][23] Typical examples are adenine-based ZnBTCA, which adaptively recognizes thymidine using sinusoid-like channels to achieve A-T base pairing, 18 and a hierarchical pore Zn-MOF based on 6-benzylaminopurine, which exclusively recognizes acetone through multiple hydrogen bond interactions between hosts and guests. 23 Purine, an alkaloid in the body, can produce a variety of tautomeric forms influenced by electron transfer.…”

Recent progress in metal–organic frameworks for the separation of gaseous hydrocarbons

“…Most of these adsorbents contain aromatic organic ligands, in which the phenyl or heterocycle rings allow strong π–π stacking interactions with C 8 aromatic molecules to facilitate the adsorption. 203,204…”

Fused aza-heterocyclic ligands: expanding the MOF chemist's toolbox

“…45 Adenine and other purines Substitution of further heteroatoms into the indazole or benzimidazole skeletons gives purine-type systems which have also seen increasing use in MOF synthesis in recent years, and where the coordination trends seen in indazoles are also evident. While the parent pyrazolopyrimidine and imidazolopyrimidine (purine) skeletons have been studied in coordination compounds in their unsubstituted forms, 46 the amino or oxo derivatives adenine HL8, hypoxanthine H 2 L9 and allopurinol H 2 L10 have proven especially effective as compact polytopic linkers in MOFs. Research in this direction has largely been directed from the biological relevance of these linkers, rather than building up from smaller rings, but the coordination chemistry of these systems shows clear parallels with that seen in the indazolederived linkers described above.…”