Chang-Sup Hong

Two new metal-organic frameworks, M(2)(dobpdc) (M = Zn (1), Mg (2); dobpdc(4-) = 4,4'-dioxido-3,3'-biphenyldicarboxylate), adopting an expanded MOF-74 structure type, were synthesized via solvothermal and microwave methods. Coordinatively unsaturated Mg(2+) cations lining the 18.4-Å-diameter channels of 2 were functionalized with N,N'-dimethylethylenediamine (mmen) to afford Mg(2)(dobpdc)(mmen)(1.6)(H(2)O)(0.4) (mmen-Mg(2)(dobpdc)). This compound displays an exceptional capacity for CO(2) adsorp

Facile postsynthetic oxidation of the thiol-laced UiO-66-type framework UiO-66(SH)2 enabled the generation of UiO-66(SO3 H)2 with sulfonic acid groups covalently linked to the backbone of the system. The oxidized material exhibited a superprotonic conductivity of 8.4×10(-2) S cm(-1) at 80 °C and 90 % relative humidity, and long-term stability of the conductivity was observed. This level of conductivity exceeds that of any proton-conducting MOF reported to date and is equivalent to the conductivi

A framework en-Mg2(dobpdc) (1-en; en = ethylenediamine) functionalized with the primary amine en was prepared via postmodification. From synchrotron PXRD data, it is revealed that the cell parameters change upon grafting of en and CO2 uptake. The adsorbed CO2 amount of 1-en is 4.57 mmol g−1 (16.7 wt%) at 25 °C and 1 bar and decreases to 3.00 mmol g−1 (11.7 wt%) at 150 °C. Noticeably, 1-en shows a significant CO2 uptake (3.62 mmol g−1, 13.7 wt%) at 0.15 bar, which is comparable to the CO2 partial

A porous metal-organic framework (MOF), [Ni2(dobdc)(H2O)2]⋅6 H2O (Ni2(dobdc) or Ni-MOF-74; dobdc(4-)=2,5-dioxido-1,4-benzenedicarboxylate) with hexagonal channels was synthesized using a microwave-assisted solvothermal reaction. Soaking Ni2(dobdc) in sulfuric acid solutions at different pH values afforded new proton-conducting frameworks, H(+)@Ni2(dobdc). At pH 1.8, the acidified MOF shows proton conductivity of 2.2×10(-2) S cm(-1) at 80 °C and 95% relative humidity (RH), approaching the highest

This review provides a comprehensive overview of post-synthetic modification of porous materials to synthesize superprotonic solid electrolytes and their membranes and explore their applications in proton exchange membrane fuel cells.

This review article introduces MOF-74 type variants and their CO₂ capture properties in terms of the open metal site and the functional groups on the ligand and open metal sites.

The amine functionalized material <bold>1-dmen</bold> shows a record high working capacity for CO₂ capture at low regeneration temperatures compared with other MOFs. Furthermore, this performance is maintained upon exposure to humidity.

Porous organic polymers (POPs) are prepared by crosslinked polymerization of multidimensional rigid aromatic building blocks. Generally, POPs can be classified into crystalline covalent organic frameworks (COFs) and other poorly crystalline or amorphous porous polymers. Due to their remarkable intrinsic properties, such as high porosity, stability, tunability, and presence of numerous building blocks, several new POPs are being developed for application across various scientific fields. The esse

Abstract An S‐shaped gas isotherm pattern displays high working capacity in pressure‐swing adsorption cycle, as established for CO 2 , CH 4 , acetylene, and CO. However, to our knowledge, this type of adsorption behavior has not been revealed for NH 3 gas. Herein, we design and characterize a hydrogen‐bonded organic framework (HOF) that can adsorb NH 3 uniquely in an S‐shape (type IV) fashion. While conventional porous materials, mostly with type I NH 3 adsorption behavior, require relatively hi

Abstract NH 3 , essential for producing artificial fertilizers and several military and commercial products, is being produced at a large scale to satisfy increasing demands. The inevitable leakage of NH 3 during its utilization, even in trace concentrations, poses significant environmental and health risks because of its highly toxic and reactive nature. Although numerous techniques have been developed for the removal of atmospheric NH 3 , conventional NH 3 abatement systems possess the disadva

Two new one-dimensional single azide-bridged metal(II) compounds [[M(5-methylpyrazole)4(N3)]n](ClO4)n(H2O)n [M = Co (1a), Ni (2a)] were prepared by treating an M(II) ion with stoichiometric amount of sodium azide in the presence of four equivalents of the 3(5)-methylpyrazole ligand. The isostructural compounds 1a and 2a crystallize in the monoclinic space group P2(1)/n. The azide bridging ligands have a unique end-to-end coordination mode that brings two neighboring metal centers into a cis-posi

Luftdicht verschlossen: In einem Ni9W6-High-Spin-Cluster (S=12) mit Cyanidbrücken sind die NiII- (grün) und WV-Ionen (violett) ferromagnetisch gekoppelt. Die Substitution der Solvensmoleküle an der Clusteroberfläche gegen 2,2′-Bipyridin ergab einen luftstabilen Ni9W6-Einzelmolekülmagnet. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2001/2006/z601759_s.pdf or from the author. Please note: The publisher is not responsible for the content

Abstract Although numerous porous adsorbents have been investigated for NH 3 capture applications, these materials often exhibit insufficient NH 3 uptake, low NH 3 affinity at the ppm level, and poor chemical stability against wet NH 3 conditions. The NH 3 capture properties of M 2 (dobpdc) complexes (M=Mg 2+ , Mn 2+ , Co 2+ , Ni 2+ , and Zn 2+ ; dobpdc 4− =4,4‐dioxidobiphenyl‐3,3‐dicarboxylate) that contain open metal sites is presented. The NH 3 uptake of Mg 2 (dobpdc) at 298 K was 23.9 mmol g

Abstract A combined sonication and microwave irradiation procedure provides the most effective functionalization of ethylenediamine (en) and branched primary diamines of 1‐methylethylenediamine (men) and 1,1‐dimethylethylenediamine (den) onto the open metal sites of Mg 2 (dobpdc) ( 1 ). The CO 2 capacities of the advanced adsorbents 1‐en and 1‐men under simulated flue gas conditions are 19 wt % and 17.4 wt %, respectively, which are the highest values reported among amine‐functionalized metal‐or