Post-synthetic reversible incorporation of organic linkers into porous metal-organic frameworks through single-crystal-to-single-crystal transformations and modification of gas-sorption properties.

The porous metal-organic framework (MOF) {[Zn(2)(TCPBDA)(H(2)O)(2)]⋅30 DMF⋅6 H(2)O}(n) (SNU-30; DMF = N,N-dimethylformamide) has been prepared by the solvothermal reaction of N,N,N',N'-tetrakis(4-carboxyphenyl)biphenyl-4,4'-diamine (H(4)TCPBDA) and Zn(NO(3))(2)⋅6 H(2)O in DMF/tBuOH. The post-synthetic modification of SNU-30 by the insertion of 3,6-di(4-pyridyl)-1,2,4,5-tetrazine (bpta) affords single-crystalline {[Zn(2)(TCPBDA)(bpta)]⋅23 DMF⋅4 H(2)O}(n) (SNU-31 SC), in which channels are divided by the bpta linkers. Interestingly, unlike its pristine form, the bridging bpta ligand in the MOF is bent due to steric constraints.

Selective gas adsorption in a magnesium-based metal-organic framework.

A doubly interpenetrated magnesium-based porous metal-organic framework exhibits thermal stability up to 500 degrees C and selective gas sorption properties for H2 and O2 gases over N2, and CO2 gas over CH4.

Selective gas adsorption in a microporous metal-organic framework constructed of CoII4 clusters.

A porous metal-organic framework, [Co(II)(4)(micro-OH(2))(4)(MTB)(2) x (H(2)O)(4)](n) x 13nDMF x 11nH(2)O (SNU-15), has been prepared; the X-ray crystal structure reveals a CaF(2)-like structure that generates 3D channels and the desolvated solid [Co(II)(4) (micro-OH(2))(4)(MTB)(2)](n) (SNU-15') exhibits selective gas sorption properties for H(2) and O(2) gases over N(2) at 77 K, with exceptionally high O(2) density, as well as for CO(2) over CH(4) at 195 and 273 K, suggesting its potential application in gas separation processes.

Enhanced hydrogen storage by palladium nanoparticles fabricated in a redox-active metal-organic framework.

Quick on the uptake: Palladium nanoparticles were fabricated simply by immersing {[Zn(3)(ntb)(2)(EtOH)(2)]4 EtOH}(n) (1) in an MeCN solution of Pd(NO(3))(2) at room temperature, without any extra reducing agent. 3 wt % PdNPs@[1](0.54+)(NO(3)(-))(0.

Proteolytic activity of Co(III) complex of 1-oxa-4,7,10-triazacyclododecane: a new catalytic center for peptide-cleavage agents.

Catalytic drugs based on target-selective artificial proteases have been proposed as a new paradigm in drug design. Peptide-cleavage agents selective for pathogenic proteins of Alzheimer's disease, type 2 diabetes mellitus or Parkinson's disease have been prepared using the Co(III) aqua complex (Co(III)cyclen) of 1,4,7,10-tetraazacyclododecane as the catalytic center. In the present study, the Co(III) aqua complex (Co(III)oxacyclen) of 1-oxa-4,7,10-triazacyclododecane was examined in search of an improved catalytic center for peptide-cleavage agents.

Multifunctional fourfold interpenetrating diamondoid network: gas separation and fabrication of palladium nanoparticles.

A fourfold interpenetrating diamondoid network, [{[Ni(cyclam)]2-(mtb)}(n)].8n H2O.4n DMF (1) (MTB=methanetetrabenzoate, DMF=dimethylformamide), has been assembled from [Ni(cyclam)][ClO4]2 (cyclam=1,4,8,11-tetraazacyclotetradecane) and methanetetrabenzoic acid (H4MTB) in DMF/H2O (7:3, v/v) in the presence of triethylamine (TEA).

Reversible transformation of ZnII coordination geometry in a single crystal of porous metal-organic framework [Zn3(ntb)2(EtOH)2].4 EtOH.

A 3D porous metal-organic framework [Zn3(ntb)2(EtOH)2]n.4nEtOH (1) that generates 1D channels of honeycomb aperture has been prepared by the solvothermal reaction of Zn(NO3)(2).6 H2O and 4,4',4''-nitrilotrisbenzoic acid (H3NTB) in EtOH at 110 degrees C.