It all makes sense: A rationally developed europium metal–organic framework incorporating immobilized Lewis basic pyridyl sites oriented towards the center of one-dimensional channels is a rare example luminescent porous MOF. By comparison luminescence intensity quenching effects various incorporated acidic metal cations, MOF exhibits sensor capability. Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited...

At elevated levels, homocysteine (Hcy, 1) is a risk factor for cardiovascular diseases, Alzheimer's disease, neural tube defects, and osteoporosis. Both 1 cysteine (Cys, 3) are linked to neurotoxicity. The biochemical mechanisms by which 3 involved in disease states relatively unclear. Herein, we describe simple methods detecting either Hcy or Cys the visible spectral region with highest selectivity reported date without using techniques preparative separations. Simple readily available...

Double Diels−Alder addition of isocorannulenofuran to dibenzocyclooctadiyne followed by deoxygenation produces a molecular tweezers C60H28 with two corannulene pincers and tetrabenzocyclooctatetraene tether. X-ray crystal structure determination its inclusion complex buckminsterfullerene C60 provides experimental evidence for the importance attractive concave−convex π−π interactions in supramolecular chemistry fullerenes buckybowls. An association constant 8600 ± 500 M-1 was estimated...

A microporous metal-organic framework, MOF, Cu(FMA)(4,4'-Bpe)0.5 (3a, FMA = fumarate; 4,4'-Bpe trans-bis(4-pyridyl)ethylene) was rationally designed from a primitive cubic net whose pores are tuned by double framework interpenetration. With pore cavities of about 3.6 A, which interconnected windows 2.0 x 3.2 3a shows highly selective sorption behaviors gas molecules.

A microporous metal-organic framework, for the first time, has been developed highly selective separation of industrially important C(1), C(2) and C(3) hydrocarbons at room temperature.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereoselective nitrile oxide cycloadditions to chiral allyl ethers and alcohols. The inside alkoxy effectK. N. Houk, Susan R. Moses, Yun Dong Wu, Nelson G. Rondan, Volker Jager, Schohe, Frank FronczekCite this: J. Am. Chem. Soc. 1984, 106, 13, 3880–3882Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published inissue 1 June 1984https://doi.org/10.1021/ja00325a040Request reuse permissionsArticle...

A microporous MOF [Zn4(OH)2(1,2,4-BTC)2] (1,2,4-BTC = Benzene-1,2,4-tricarboxylate) with two immobilized open metal Zn2+ sites was obtained by solvothermal reaction, which exhibits highly selective guest sorption and sensing of nitrobenzene.

Abstract A novel three‐dimensional microporous metal–organic framework Zn 4 L(DMA) ( UTSA‐33 , H 8 L=1,2,4,5‐tetra(5‐isophthalic acid)benzene, DMA= N ′‐dimethylacetamide) with small pores of about 4.8 to 6.5 Å was synthesized and structurally characterized as a non‐interpenetrated (4,8)‐connected network the flu topology (Schläfli symbol: (4 12 6 )(4 ) 2 ). The activated exhibits highly selective separation acetylene, ethylene, ethane from methane adsorption selectivities 20 at 296 K, which...

The synthesis of new benzo[a]- and [b]xanthene dye frameworks is described. A unique benzo[a]xanthene, seminaphtho[a]fluorone (SNAFR-1), studied in a variety media. optimization solution parameters excitation wavelengths allows SNAFR-1 to display red, green, blue emission bands approximately equal intensities also produce white light. Ratiometric red (anion) green (neutral) emissions are observed upon varying pH. pH-independent violet-blue band due the addition nucleophiles benzylic carbon SNAFR-1.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective perturbation of ligand field excited states in polypyridine ruthenium(II) complexesLeslie J. Henderson Jr., Frank R. Fronczek, and William CherryCite this: Am. Chem. Soc. 1984, 106, 20, 5876–5879Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue 1 October 1984https://pubs.acs.org/doi/10.1021/ja00332a020https://doi.org/10.1021/ja00332a020research-articleACS PublicationsRequest reuse...

The enantioselective addition of alcohols to imine electrophiles has been shown proceed in the presence a catalytic amount chiral phosphoric acid catalyst. reaction allows for formation respective N,O-aminals excellent yield and enantioselectivity. A total 11 different imines were successfully used as clear demonstration generality.

Leuchtkraft als Indikator: Ein Metall-organisches Netzwerk (MOF) mit Europiumionen und Lewis-basischen Pyridylzentren, die in Mitte von eindimensionalen Kanälen weisen, zählt zu den wenigen bekannten lumineszierenden porösen MOFs. Beim Vergleich der Lumineszenzlöschung nach Einschluss verschiedener Lewis-acider Metallkationen entpuppte sich das MOF potenzieller Sensor. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed,...

A series of symmetrical cationic phthalocyanines (Pcs) with either Zn(II) or Si(IV) metal ions and two bulky axial ligands on the silicon complexes was synthesized in high yields. The photophysical (absorption, emission, fluorescence, singlet oxygen quantum yields) cellular (uptake, toxicity, subcellular localization) properties this Pcs were investigated. Si(IV)−Pcs exist mainly as monomers aqueous media have higher fluorescent yields protic solvents (methanol water) than Zn(II)−Pcs....

A separation story! microporous metal–organic framework (UTSA-34) of non-interpenetrated binodal (4,6)-connected ybh network with interconnected cages about 12.8 Å has been realised to exhibit highly selective C2 hydrocarbons from methane a capacity 3.0 mol kg−1 and selectivity 35 at room temperature (see figure). Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted...

A novel robust three-dimensional lanthanide organic framework with high thermal stability has been demonstrated to exhibit the potential for purification of natural gas in nearly pure form from an 8-component mixture at room temperature.

Rh-catalyzed, chelation-induced, C-5 regioselective C–H functionalization of 8-amidoquinolines with a range N-Boc aminals is reported for the first time. The addition in situ generated imines to C(sp2)–H bonds afforded branched amines good excellent yields. Moreover, this transformation features functional group compatibility, broad substrate scope, and mild reaction conditions suitable gram-scale synthesis. In addition, an unprecedented, site-selective, remote dimerization quinolines led...

Porous Cu-Cd mixed-metal-organic frameworks [[Cd(NO(3))(2)](2)[(Cu(Pyac)(2)](3)] (M'MOF 1) and [[CdCl(2)][Cu(Pyac)(2)](2)] (M'MOF2) [Cu(Pyac)(2) = bis[3-(4-pyridyl)pentane-2,4-dionato]copper(II)] have been synthesized by the reaction of Cu(Pyac)(2) with Cd(NO(3))(2) CdCl(2). They are noninterpenetrating 1D ladder 2D square-grid frameworks, constructed from building blocks T-shaped nodes square-planar CdCl(2) nodes, respectively. The ladders square grids stacked in ABCABC... ABCDEF......

Two metal-organic frameworks (MOFs), MOF-501 and MOF-502, respectively, formulated as Co(2)(BPTC)(H(2)O)(5).G(x) Co(2)(BPTC)(H(2)O)(DMF)(2).G(x) (BPTC = 3,3',5,5'-biphenyltetracarboxylate; G guest molecules), have been synthesized structurally characterized, their topologies were found to be based on the NbO (MOF-501) PtS (MOF-502) nets. Heating in solution results more thermodynamically favored MOF-502.

Water-soluble phthalocyanines are promising photosensitizers for application in cancer therapy and the photoinactivation of viruses. The water-soluble zinc(II) 5 6 were synthesized by converting corresponding ester derivative 4 into sodium carboxylate carboxylic acid species. Compound can be solubilized water as a monomeric species, demonstrated UV/vis fluorescence spectroscopy. These compounds characterized analytical spectroscopic methods and, case 4, X-ray crystallography. found to have...

The title compound crystallizes from anhydrous solvents in a simple square-grid topology, but when water is present, crystals form with an unusual interpenetrated 3D NbO topology whose pores contain hydrogen-bonded solvent molecules.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Elucidation and Chemistry of a Novel Family Bioactive Sesquiterpenes: HeliannuolsFrancisco A. Macias, Jose M. G. Molinillo, Rosa Varela, Ascension Torres, Frank R. FronczekCite this: J. Org. Chem. 1994, 59, 26, 8261–8266Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org/doi/10.1021/jo00105a052https://doi.org/10.1021/jo00105a052research-articleACS...

Four new bis(m-phenylene)-32-crown-10-based cryptands with different third bridges were prepared. Their complexes paraquat derivatives studied by proton NMR spectroscopy, mass spectrometry, and X-ray analysis. It was found that these bind very strongly. Specifically, a diester cryptand pyridyl nitrogen atom located at site occupied either water or PF6 anion in analogous exhibited the highest association constant Ka = 5.0 × 106 M-1 acetone paraquat, 9000 times greater than crown ether system....

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Cryptand/Bisparaquat [3]Pseudorotaxane by Cooperative ComplexationFeihe Huang, Frank R. Fronczek, and Harry W. GibsonView Author Information Department of Chemistry, Virginia Polytechnic Institute State University, Blacksburg, 24061, Louisiana Baton Rouge, 70803 Cite this: J. Am. Chem. Soc. 2003, 125, 31, 9272–9273Publication Date (Web):July 12, 2003Publication History Received11 April 2003Published online12 July inissue 1 August...