A Microporous Porphyrin-Based Hydrogen-Bonded Organic Framework for Gas Separation

Abstract

A hydrogen-bonded organic framework (HOF), HOF-7, based on a zinc porphyrin-based building block (ZnTDPP) with diaminotriazine moieties has been successfully constructed and structurally characterized (ZnTDPP = 5,10,15,20-tetrakis(4-(2,4-diaminotriazinyl)phenyl)porphyrinato zinc). Single-crystal X-ray diffraction analysis reveals that HOF-7 is built by the 2D layered subunits connected by the intermolecular hydrogen-bonding and π−π interaction, exhibiting two kinds of micropores with sizes of 3.2 × 4.7 Å 2 and 4.2 × 6.7 Å 2 , respectively. This HOF exhibits permanent porosities as demonstrated in the CO 2 sorption and selective adsorption of CO 2 over N 2 .

Designing Hydrogen‐Bonded Organic Frameworks (HOFs) with Permanent Porosity

“…[42] Chen et al demonstrated that WuestsH OF, HOF-1,p ossessed permanent porosity with an SA (BET) value of 359 m 2 g À1 and was thermally stable up to 420 8 8C. [43] They also revealed that HOF-1 could selectively separate C 2 H 2 /C 2 H 4 under ambient conditions.Upon applying various tectons with DAT groups,they constructed as eries of HOFs (HOF-2, [44] HOF-3, [45] HOF-4, [46] HOF-5, [47] HOF-6, [48] HOF-7, [49] HOF-9 [50] ), with different crystal structures,H -bonded network topologies,p ore shapes and sizes,a nd functionalities.F or example, HOF-2 with au nimodal 6-connected {3 3 5 5 6 6 7} network topology constituted with aB INOL derivative underwent enantioselective absorption of secondary alcohols,s uch as 1-phenylethanol, up to 92 %, as well as C 2 H 2 /CO 2 selective separation. [44] The HOF-3 with 3-connected srs topology showed selective separation of C 2 H 2 over CO 2 at ambient temperature and pressure.…”

Synthesis of cyclophosphazene bridged mesoporous organosilicas for CO 2 capture and Cr (VI) removal

“…observation of the hysteresis could be due to the structural transformation or rearrangements and also interactions of the CO 2 in flexible materials [59,60]. The organic chain in the framework might have some effect in this too.…”

Organische molekulare Gerüste mit extrinsischer Porosität: eine Plattform für die Kohlendioxid‐Abscheidung und Speicherung

“…Durch Strukturuntersuchung wurde gefunden, dass eine der Amingruppen der 2,4‐Diaminotriazin‐Einheit an primären Wasserstoffbrücken zum Zusammenhalt des Wirtgerüsts beteiligt ist, während die andere Amingruppe an der Porenoberfläche für potenzielle Wechselwirkungen mit Gastmolekülen freiliegt. Durch Anfügen der gleichen funktionellen Gruppe an verschiedene Zentraleinheiten ( M6 – M10 ) wurde eine Reihe von Bausteinen zum Herstellen von POMFs erzeugt ( HOF‐2 – HOF5 und HOF ‐ 7 ; Abbildung ), ein Beleg dafür, dass 2,4‐Diaminotriazin‐Gruppen aufgrund der Möglichkeit zu gegenseitigen Wasserstoffbrücken für verschiedene POMF‐Aggregate geeignet sind. Diese POMF‐Materialien zeigten eine starke selektive Adsorption von CO 2 , CH 4 und kleinen Kohlenwasserstoffen.…”