The development of a palladium-catalyzed decarboxylative coupling reaction arene carboxylates with olefinic substrates is described. optimized procedure for palladation employs Pd(O2CCF3)2 as catalyst (0.2 equiv) in the presence Ag2CO3 (3 solvent 5% DMSO-DMF and proceeds at temperatures 80-120 degrees C wide range alkenes substrates. process proposed to proceed by an initial Ar-SE involving ipso attack electrophilic Pd(II) intermediate on carboxylate form arylpalladium(II) species loss...

Mechanistic studies of a palladium-mediated decarboxylative olefination arene carboxylic acids are presented, providing spectroscopic and, in two instances, crystallographic evidence for intermediates proposed stepwise process. Sequentially, the pathway involves carboxyl exchange between palladium(II) bis(trifluoroacetate) and an acid substrate, rate-determining decarboxylation to form arylpalladium(II) trifluoroacetate intermediate (containing trans-disposed S-bound dimethyl sulfoxide...

Open the gate! A porous coordination polymer shows abrupt changes in its adsorption isotherm with guest-dependent gate-opening pressure (see picture). Kinetic analysis reveals that structure transformation follows a model, which proceeds through formation of an intermediate by process. This process provides significant difference onset between similar gas molecules. Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2008/z705822_s.pdf...

MOF on MOF: Core-shell porous coordination polymer (PCP) crystals are fabricated at the single-crystal level by epitaxial growth in solution. Synchrotron X-ray diffraction measurements unveiled structural relationship between shell crystal and core crystal, where in-plane rotational compensates difference lattice constant.

Controlling guests: Porous coordination polymers containing mobile organic groups, such as naphthalene rings (see picture), are synthesized, and their rotational motion is characterized by solid-state 2H NMR spectroscopy. The rotation of the groups can be switched off (blue) guest (blue spheres) adsorption on (yellow) again desorption. Supporting information for this article available WWW under http://www.wiley-vch.de/contents/jc_2002/2006/z603196_s.pdf or from author. Please note: publisher...

Three supramolecular isomers, [Cu(μ4-BQ)(μ2-OAc)2]n (α phase), [Cu(μ3-BQ)(μ2-OAc)(μ3-OAc)]n (β and [Cu(μ2-BQ)(μ3-OAc)2]n (γ were crystallized by using the organometallic building block shown, which has two types of synthon. Interestingly, these three isomers from same solvent. BQ=benzoquinone. Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2004/z53463_s.pdf or author. Please note: The publisher not responsible content functionality...

[reaction: see text] A palladium-catalyzed decarboxylative arylation reaction was shown to produce Heck-type coupling products using a number of different arene carboxylic acid and 2-cycloalken-1-one substrates. The more conventional Heck an aryl iodide reactant also briefly explored for comparison, where it found that phosphine-free (Jeffery) conditions afforded the highest yield product.

In recent years, a new class of porous materials based on combination organic components and metal centers has emerged, called coordination polymers (PCPs). PCPs have unique characteristics: regular nanosized spaces, flexibility, designed pore surface. The interaction between PCP nanospaces guest molecules controls the nanoscale molecular assembly. this short review, correlations will be introduced under rubric "template".

An interdigitated porous coordination polymer with hydrophobic pore surface shows size and affinity dependent selective gas sorption properties accompanying the reversible structure transformation.

Confinement of electron donor guests affords an efficient, photo-induced charge transfer (CT) with the anthracene moieties a porous coordination polymer.

Abstract In contrast to AI hardware, neuromorphic hardware is based on neuroscience, wherein constructing both spiking neurons and their dense complex networks essential obtain intelligent abilities. However, the integration density of present devices much less than that human brains. this report, we molecular devices, composed a dynamic extremely network single-walled carbon nanotubes (SWNTs) complexed with polyoxometalate (POM). We show experimentally SWNT/POM generates spontaneous spikes...

We developed a facile and unique process for preparing boron-doped porous carbon by direct carbonization of boron-based covalent organic framework (COF-5). Boron oxides, which are formed during the COF-5, were readily removed through water treatment resulting to obtain carbon. Thus, boron atoms successfully incorporated into matrix. Supercapacitor electrodes made fabricated exhibited specific capacitance 15.3 μF cm−2 at 40 mA g−1, is twice that conventional activated electrode (∼6.9 cm−2)...

Certain metal complexes are known as high-performance CO2 reduction photocatalysts driven by visible light. However, most of them rely on rare, precious metals principal components, and integrating the functions light absorption catalysis into a single molecular unit based abundant remains challenge. Metal-organic frameworks (MOFs), which can be regarded intermediate compounds between molecules inorganic solids, potential platforms for construction simple photocatalytic system composed only...

The thermal conductivity of polycrystalline samples (Na,Ca)Co_2O_4 is found to be unusually low, 20 mW/cmK at 280 K. On the assumption Wiedemann-Franz law, lattice estimated 18 K, and it does not change appreciably with substitution Ca for Na. A quantitative analysis has revealed that phonon mean free path comparable parameters, where point-defect scattering plays an important role. Electronically same show a metallic conduction down 4.2 which strongly suggests NaCo_2O_4 exhibits glass-like...

A porous coordination polymer (PCP) with immobilization of sodium cations on the pore surface has been synthesized, by employing a bifunctional carboxylate/sulfonate ligand, and structurally characterized. The framework 1D channels dimension 4.9 x A2 shows high thermal stability ( approximately 330 degrees C), affording Type I adsorption isotherms for CO2, acetone, benzene. chemical shift 13C NMR characteristic energy (betaE0) acetone adsorbed in this compound represent Lewis acidity framework.

A flexible porous coordination polymer with interdigitated structure (CID-3) has been synthesized whose pore size and structural flexibility are suitable for CO2 capture, providing us highly selective adsorption properties of from a ternary O2 ,N2 mixture.

We have synthesized a porous coordination polymer containing pyridinium cation as an organic linker and investigated the methanol absorptive ability of cationic surface. The result implies that surface participates in strong adsorption methanol.

A tetraphenylporphyrin based Tb(III) double-decker complex has been synthesized and the crystal structure of both protonated deprotonated forms determined. The ac magnetic susceptibility measurements revealed that SMM properties can be reversibly switched by only a single proton.

There is continuous activity to increase the efficiency and reduce size of power electronic systems modules developed for transportation automotive electrification applications [1], [2]. One key requirements achieving these objectives operate semiconductor devices at higher density junction temperature (Tj max), while maintaining high reliability. The emergence wideband-gap (WBG) semiconductors [silicon carbide (SiC) gallium nitride (GaN)] [9] new high-temperature die-attach methods,...

Recently, metal-organic frameworks (MOFs) composed of sulfur secondary building units (sulfur-SBUs) have attracted significant attention as unique electronic materials with high conductivities and photo- electrocatalytic properties. Herein we report the crystal structure KGF-1, an example a Pb-MOF three-dimensionally extended sulfur-SBUs that displays molecular sieving behavior, visible-light absorption, semiconductor band is hydrogen-evolution photocatalyst.

Abstract MOF im MOF: Einkristalle eines porösen Kern‐Schale‐Koordinationspolymers (PCP) wurden durch epitaxiales Wachstum in Lösung erzeugt. Synchrotron‐Röntgenbeugungsmessungen offenbarten die strukturellen Beziehungen zwischen dem Kern‐ und Schalenkristall: Ein verdrehter Orientierung gleicht unterschiedlichen Gitterkonstanten aus. magnified image

The acetylene-sorption properties of six porous coordination polymers (PCPs), [M(2)(L)(2)(dabco)](n) (dabco=1,4-diazabicyclo[2.2.2]octane, M=Cu(2+) (1), Zn(2+) (2), L=1,4-benzenedicarboxylate (bdc; 1 a, 2 a), 1,4-naphthalenedicarboxylate (ndc; b, b), 9,10-anthracenedicarboxylate (adc; c, c)), were investigated. acetylene sorption isotherms and measured at 195 K are type I show a steep increase low relative pressures. carbon dioxide also Compounds showed large difference in onset pressure...

Tore auf! Ein poröses Koordinationspolymer zeigt abrupte Änderungen seiner Adsorptionsisotherme, wobei der Porenöffnungsdruck von Gastspezies abhängt (siehe Bild). Kinetikanalysen belegen, dass die unter Strukturumwandlung ablaufende Adsorption einem Porenöffnungsmodell folgt, demzufolge sie über Bildung eines Intermediats verläuft. Dieser Prozess führt dazu, ähnliche Gasmoleküle deutlich unterschiedliche Schwellendrücke haben. Supporting information for this article is available on the WWW...