The rational construction and operation of an ideal helical spring has been investigated. infinite helices, [Ag(Py2O)]X (Py2O = 3,3'-oxybispyridine; X- NO3-, BF4-, ClO4-, PF6-), have constructed in high yield via cooperative effects the skewed conformer Py2O potential linear geometry N−Ag(I)−N bond. Crystallographic characterization reveals that polymer framework is cationic cylindrical helix its counteranions are pinched two columns inside helix. four anions exchanged for each other aqueous...

Isoforms of the NADPH oxidase contribute to vascular superoxide anion (*O2-) formation and limit NO bioavailability. We hypothesized that endothelial gp91phox-containing is predominant in generating O2- scavenge thus responsible for development dysfunction.Endothelial dysfunction was studied aortic rings from wild-type (WT) gp91phox-knockout (gp91phox-/-) mice with without renovascular hypertension induced by renal artery clipping (2K1C). Hypertension 2K1C more severe WT than gp91phox-/-...

A bulk heterojunction photocatalyst of interfacing CaFe(2)O(4) and MgFe(2)O(4) nanoparticles is highly active for oxidative degradation isopropyl alcohol hydrogen production from water under visible light, because the exciton easily reaches interface dissociates to minimize recombination.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotomechanical Polymers. Synthesis and Characterization of a Polymeric Pyrazine-Bridged Cobalt Semiquinonate-Catecholate ComplexOk-Sang Jung Cortlandt G. PierpontCite this: J. Am. Chem. Soc. 1994, 116, 5, 2229–2230Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.org/doi/10.1021/ja00084a107https://doi.org/10.1021/ja00084a107research-articleACS PublicationsRequest...

Intramolecular electron transfer between CoII(SQ) and CoIII(Cat) species has been investigated for the series of complexes Co(py2X)(3,6-DBQ)2, where 3,6-DBQ are semiquinonate catecholate forms 3,6-di-tert-butyl-1,2-benzoquinone py2X is bis(pyridine) ether its heteroatomic analogs with X = S, Se, Te. Transition temperature Co(III)/Co(II) redox isomerism decreases in steps approximately 30 K toluene solution 80 solid state This appears to be primarily associated an entropy increase that...

Studies on the subtle effects and roles of polyatomic anions in self-assembly a series AgX complexes with 2,4'-Py(2)S (X(-) = NO(3)(-), BF(4)(-), ClO(4)(-), PF(6)(-), CF(3)CO(2)(-), CF(3)SO(3)(-); 2,4'-thiobis(pyridine)) have been carried out. The formation products appears to be primarily associated suitable combination skewed conformers variety coordination geometries Ag(I) ions. molecular construction via is delicately dependent upon nature anions. Coordinating afford 1:1 adducts...

Low-density lipoprotein increases the AT1-receptor gene expression in vascular smooth muscle cells. To elucidate whether elevated cholesterol serum levels upregulate AT1 receptor and its functional response to angiotensin II vivo, we compared 1) vasoconstrictive effect of 2) level aortas normocholesterolemic hypercholesterolemic rabbits. Contraction experiments on isolated aortic rings showed that II-induced vasoconstriction was increased New Zealand White rabbits with This difference caused...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBistability and Low-Energy Electron Transfer in Cobalt Complexes Containing Catecholate Semiquinone LigandsOk-Sang Jung Cortlandt G. PierpontCite this: Inorg. Chem. 1994, 33, 10, 2227–2235Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 1994https://pubs.acs.org/doi/10.1021/ic00088a027https://doi.org/10.1021/ic00088a027research-articleACS PublicationsRequest reuse permissionsArticle...

ConspectusTailor-made molecular channel architectures are a hot issue in the fields of nanotechnology, sieves, ion sensors, recognition, confined space reactors, and fluidic transport systems. Carbon nanotubes have been particular focus, though they cannot easily be synthesized to predefined structures sizes. Rational design construction based on coordination chemistry has recognized as useful approach. Metal–organic (MOC) can generated by utilizing, at least principle, self-assembly metal...

Infinite molecular helices [Ag(3,3'-Py2S)]X (3,3'-Py2S = 3,3'-thiobispyridine; X- BF4-, ClO4-, and PF6-) have been rationally constructed or induced. Crystallographic characterization (X- monoclinic P21/n, a 8.946(3) Å, b 14.130(2) c 10.124(2) β 107.83(2)°, V 1218.3(5) Å3, Z 4, R 0.0351; 8.884(1) 14.305(3) 10.110(1) 106.78(1)°, 1230.1(3) 0.0417; PF6-, P21/c, 10.959(2) 9.808(2) 14.065(3) 112.03(2)°, 1401.4(5) 0.0442) reveals that the skeletal structure is an oblong cylindrical cationic helix...

Slow diffusion of AgNO3 with Me2Si(4-Py)2 yields an interwoven 2-nm-thick sheet consisting the building block [Ag3(Me2Si(4-Py)2)4](NO3)3.H2O. The interweaving induces unique nanotunnels a 16 x 18 A2 cross section 7 8 square pore. anion NO3- skeletal can be reversibly exchanged appropriately sized anions without collapse its structural integrity. compound has melting point (140 degrees C) and exists as first 2D ionic liquid up to 193 C.

The unique cage complexes [[(Me4en)Pd]3(L)2](X)6 (L = 1,3,5-tris(isonicotinoyloxyethyl)cyanurate; X− BF4−, ClO4−) were constructed. A single water molecule in a skeletal was reversibly associated and dissociated via combination of the adequate space, polar environment, conformational flexibility cage. In Suzuki−Miyaura C−C cross-coupling reactions, complex showed significant catalytic activity along with effects isolated molecule.

Renal disease is a common and serious complication in HIV-infected patients.A retrospective cohort analysis for the period 1989-2010 was carried out to determine prevalence, incidence risk factors end-stage renal (ESRD). ESRD defined as initiation of replacement therapy. Three time periods were defined: 1989-1996 [pre-highly active antiretroviral therapy (HAART)], 1997-2003 (early HAART) 2004-2010 (late HAART).Data 9198 patients [78.2% male; 88.9% Caucasian; cumulative observation 68 084...

Slow diffusion of AgX with O(SiMe2(4-Py))2 (L) yields unique molecular rectangles consisting [Ag(L)]2X2 (X- = NO3-, ClO4-, PF6-, and CF3SO3-). For the rectangular system, transannular argentophilic (Ag−Ag) interaction competes between Ag(I) its anions, while π−π interactions are constantly preserved. The strength is in following order: NO3- > ClO4- PF6- CF3SO3- reversibly stretched via anion exchange from 3.20(1) to 3.81(1) Å without destruction cyclic skeleton.

Studies of the anion effects on molecular construction a series AgX complexes with bis(4-pyridyl)dimethylsilane (L) (X- = NO2-, NO3-, CF3SO3-, and PF6-) have been carried out. Formation skeletal bonds appears to be primarily associated suitable combination bidentate N-donors L variety coordination geometries Ag(I) ions. The L:Ag(I) ratios products are dependent nature polyatomic anions. 1:1 adduct Ag(I)-L for 3:4 2:3 1:2 PF6- obtained. A linear relationship between ratio ligand metal...

The self-assembly of Zn(II) ions with 1,3,5-tris(isonicotinoyloxyethyl)cyanurate produces new topological (4(2)⋅12(4))3(4(3))4 2D metal-organic frameworks (MOFs) anion-confining cages. eclipsed assembly each MOF by π-π stacking cyanurate moieties (3.352(5) Å) forms 3D MOFs consisting nanochannels (10.5 Å). Two the three anions are confined in peanut-type cage, resulting hydrophobicity nanochannels. hydrophobic nanochannel effectively adsorbs a wide range fused aromatic hydrocarbons (FAHs) as...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic Parameters for Cobalt-Quinone Electron Transfer and Spin Transition Steps of the CoIII(bpy)(3,5-DBSQ)(3,5-DBCat)/CoII(bpy)(3,5-DBSQ)2 Valence Tautomeric EquilibriumCortlandt G. Pierpont Ok-Sang JungCite this: Inorg. Chem. 1995, 34, 16, 4281–4283Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published inissue 1 August 1995https://doi.org/10.1021/ic00120a041RIGHTS & PERMISSIONSArticle...

A two-dimensional square-grid-shaped coordination polymer incorporating the dithiaoxa macrocycle (1), [Cu(1)CN]n (2), has been prepared by a self-assembly process involving interaction of 1 with CuCN; parallel reaction CuI afforded one-dimensional double-stranded [Cu(1)I]n (3).