wtorek, 31 sierpnia 2010

Effect of substituents of alloxazine derivatives on the selectivity and affi...

 
 

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przez RSC - Org. Biomol. Chem. latest articles autor: Norio Teramae dnia 10-08-31

Burki Rajendar, Arivazhagan Rajendran, Zhiqiang Ye, Eriko Kanai, Yusuke Sato, Seiichi Nishizawa, Marek Sikorski, Norio Teramae
(Paper from Org. Biomol. Chem.)
Burki Rajendar, Org. Biomol. Chem., 2010, DOI: 10.1039/c0ob00057d
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poniedziałek, 30 sierpnia 2010

Quantitative Correlation of Physical and Chemical Properties with Chemical Structure: Utility for Prediction


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Quantitative Correlation of Physical and Chemical Properties with Chemical Structure: Utility for Prediction

Chemical Reviews, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable).


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Tricyclic Host for Linear Anions


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Tricyclic Host for Linear Anions

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piątek, 27 sierpnia 2010

Diindeno[1,2,3,4-defg;1[prime or minute],2[prime or minute],3[prime or minut...

 
 

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przez RSC - Chem. Commun. latest articles autor: Yao-Ting Wu dnia 10-08-26

Hung-Ing Chang, Hsin-Ting Huang, Cheng-Hao Huang, Ming-Yu Kuo, Yao-Ting Wu
(Communication from Chem. Commun.)
Hung-Ing Chang, Chem. Commun., 2010, DOI: 10.1039/c0cc01730b
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Controlled and Chemoselective Reduction of Secondary Amides

 
 

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przez Journal of the American Chemical Society: Latest Articles (ACS Publications) autor: Guillaume Pelletier et al dnia 10-08-25

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niedziela, 22 sierpnia 2010

Synthesis and Fluorescence Properties of a Pyridomethene−BF2 Complex

 
 

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przez Organic Letters: Latest Articles (ACS Publications) autor: Yasuhiro Kubota et al dnia 10-08-20

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czwartek, 19 sierpnia 2010

Synthesis, Spectroscopy, Crystal Structure Determination, and Quantum Chemic...

 
 

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przez Chemistry – An Asian Journal autor: Wim Dehaen dnia 10-07-29

Abstract

Starting from the conformationally unconstrained compound 3,5-di-(2-bromophenoxy)-4,4-difluoro-8-(4-methylphenyl)-4-bora-3a,4a-diaza-s-indacene (1), two BODIPY dyes (2 and 3) with increasingly rigid conformations were synthesized in outstanding total yields through palladium catalyzed intramolecular benzofuran formation. Restricted bond rotation of the phenoxy fragments leads to dyes 2 and 3, which absorb and fluoresce more intensely at longer wavelengths relative to the unconstrained dye 1. Reduction of the conformational flexibility in 2 and 3 leads to significantly higher fluorescence quantum yields compared to those of 1. X-ray diffraction analysis shows the progressively more extended planarity of the chromophore in line with the increasing conformational restriction in the series 123, which explains the larger red shifts of the absorption and emission spectra. These conclusions are confirmed by quantum chemical calculations of the lowest electronic excitations in 13 and dyes of related chemical structures. The effect of the molecular structure on the visible absorption and fluorescence emission properties of 13 has been examined as a function of solvent by means of the new, generalized treatment of the solvent effect (J. Phys. Chem. B2009, 113, 5951–5960). Solvent polarizability is the primary factor responsible for the small solvent-dependent shifts of the visible absorption and fluorescence emission bands of these dyes.

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To close to color: A sequence of nucleophilic aromatic substitution and palladium catalyzed ring formation yields conformationally restricted BODIPY dyes with large red shifts of the absorption and emission spectra (see figure).


 
 

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The Effects of Microenvironment Polarity and Dendritic Branching of Aliphati...

 
 

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przez Chemistry – An Asian Journal autor: Kong-Hung Sze dnia 10-07-29

Abstract

Two series of aliphatic hydrocarbon-based G1–G3 dendritic 2-ureido-4-pyrimidinones (UPy) (S-Gn)2 and (L-Gn)2, differing from one another by the distance between the branching juncture to the urea end, were prepared and characterized. These hydrocarbon dendrons were also appended to a p-aminonitrobenzene solvatochromic chromophore in order to probe their microenvironment polarity. While positive solvatochromism was observed which indicated the chromophore was solvent accessible, there was no significant difference between the microenvironment polarities on going from the G1 to the G3 dendrons. The self-assembling behavior and tautomeric preference of the dendritic UPy derviatives were examined by 1H NMR spectroscopy. The dimerization constants (Kdim*) of the DDAA tautomers were unchanged at 107M−1 in CDCl3 at both 25 and 50 °C, which were comparable to those of UPy compounds bearing other nonpolar substitutents. Furthermore, the lower limits on the Kdim* of the DADA tautomeric forms of the (S-Gn)2 and (L-Gn)2 series were determined to be 106 and 105M−1 in CDCl3, respectively. It was found that a closer proximity of the dendron branching juncture to the UPy unit could lead to a destabilization effect on the dimeric states. Hence, the (L-Gn)2 dimers are more stable than those of (S-Gn)2 in the DDAA form, but the latter are more stable than the former in the tautomeric DADA state. This study showed that both the highly nonpolar microenvironment and the proximity of the dendritic branching juncture to the UPy motif could alter the strength and profile of the hydrogen bond-mediated self-assembling process.

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DADADA! Aliphatic hydrocarbon dendrons, by conferring a highly nonpolar microenvironment around their vicinity, can preserve the strong dimerization properties of a quadruple hydrogen bonding 2-ureido-4-pyrimidinone moiety. They can also alter its tautomeric behavior and dimerization strength through their unique branching pattern.


 
 

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Geometric correlations and infrared spectrum of adenine-uracil hydrogen bond...

 
 

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przez RSC - Phys. Chem. Chem. Phys. latest articles autor: Oliver Kuhn dnia 10-08-17

Yun-an Yan, Oliver Kuhn
(Paper from Phys. Chem. Chem. Phys.)
Yun-an Yan, Phys. Chem. Chem. Phys., 2010, DOI: 10.1039/c0cp00009d
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Rational design of visible and NIR distyryl-BODIPY dyes from a novel fluorin...

 
 

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przez RSC - Org. Biomol. Chem. latest articles autor: Gilles Clavier dnia 10-08-17

Olivier Galangau, Cecile Dumas-Verdes, Rachel Meallet-Renault, Gilles Clavier
(Paper from Org. Biomol. Chem.)
Olivier Galangau, Org. Biomol. Chem., 2010, DOI: 10.1039/c004812g
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"Nindigo": synthesis, coordination chemistry, and properties of indigo diimi...

 
 

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przez RSC - Chem. Commun. latest articles autor: Robin G. Hicks dnia 10-08-18

Simon R. Oakley, Graeme Nawn, Kate M. Waldie, Timothy D. MacInnis, Brian O. Patrick, Robin G. Hicks
(Communication from Chem. Commun.)
Simon R. Oakley, Chem. Commun., 2010, DOI: 10.1039/c0cc01736a
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środa, 18 sierpnia 2010

A Fluorogenic Reaction Based on Heavy-Atom Removal for Ultrasensitive DNA De...

 
 

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poniedziałek, 16 sierpnia 2010

A Unified pH Scale for All Phases

 
 

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przez Angewandte Chemie International Edition autor: Ingo Krossing dnia 10-08-09

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One for all! On the basis of the absolute chemical potential of the proton, a unified absolute pH scale is introduced that is universally applicable in the gas phase, in solution, and in the solid state. With this scale it is possible to directly compare acidities in different media and to give a thermodynamically meaningful definition of superacidity. This scale can be used in all areas with variable proton activity.


 
 

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Cytosine modules in quadruple hydrogen bonded arrays


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Cytosine modules in quadruple hydrogen bonded arrays


Elisabetta Greco, Abil E. Aliev, Valerie G. H. Lafitte, Kason Bala, David Duncan, Laura Pilon, Peter Golding, Helen C. Hailes

(Paper from New J. Chem.)

Elisabetta Greco, New J. Chem., 2010, DOI: 10.1039/c0nj00197j

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Interaction of tripodal Schiff-base ligands with silver(i): structural and solution studies


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Interaction of tripodal Schiff-base ligands with silver(i): structural and solution studies


Marco Wenzel, Kathrin Wichmann, Kerstin Gloe, Karsten Gloe, Hans-Jurgen Buschmann, Keisuke Otho, Martin Schroder, Alexander J. Blake, Claire Wilson, Allison M. Mills, Leonard F. Lindoy, Paul G. Plieger

(Paper from CrystEngComm)

Marco Wenzel, CrystEngComm, 2010, DOI: 10.1039/c0ce00255k

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Mapping out the synthetic landscape for re-crystallization, co-crystallization and salt formation


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Mapping out the synthetic landscape for re-crystallization, co-crystallization and salt formation


Christer B. Aakeroy, Arbin Rajbanshi, Z. Jane Li, John Desper

(Paper from CrystEngComm)

Christer B. Aakeroy, CrystEngComm, 2010, DOI: 10.1039/c0ce00052c

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niedziela, 15 sierpnia 2010

Estimating the Hydrogen Bond Energy


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Estimating the Hydrogen Bond Energy

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sobota, 14 sierpnia 2010

Quantum-chemical study and FTIR jet spectroscopy of CHCl3-NH3 association in the gas phase


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Quantum-chemical study and FTIR jet spectroscopy of CHCl3-NH3 association in the gas phase


Michael Hippler, Susanne Hesse, Martin A. Suhm

(Paper from Phys. Chem. Chem. Phys.)

Michael Hippler, Phys. Chem. Chem. Phys., 2010, DOI: 10.1039/c0cp00530d

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Molecular Assemblies of 4-(Hexadecyloxy)-N-(pyridinylmethylene)anilines at the Air−Water Interface and Cu(II)-Promoted Vesicle Formation via Metal Coordination


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Molecular Assemblies of 4-(Hexadecyloxy)-N-(pyridinylmethylene)anilines at the Air−Water Interface and Cu(II)-Promoted Vesicle Formation via Metal Coordination

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B

Extremely Large Dipole Moment in the Excited Singlet State of Tris{[p-(N,N-dimethylamino)phenylethynyl]duryl}borane


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Extremely Large Dipole Moment in the Excited Singlet State of Tris{[p-(N,N-dimethylamino)phenylethynyl]duryl}borane

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B

Secondary Hydrogen Isotope Effects on the Structure and Stability of Cation−π Complexes (Cation = Li+, Na+, K+ and π = Acetylene, Ethylene, Benzene)


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Secondary Hydrogen Isotope Effects on the Structure and Stability of Cation−π Complexes (Cation = Li+, Na+, K+ and π = Acetylene, Ethylene, Benzene)

The Journal of Physical Chemistry A, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable).


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piątek, 13 sierpnia 2010

czwartek, 12 sierpnia 2010

Ionothermal Route to Layered Two-Dimensional Polymer-Frameworks Based on Heptazine Linkers


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Ionothermal Route to Layered Two-Dimensional Polymer-Frameworks Based on Heptazine Linkers

Macromolecules, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable).


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Torsionally Responsive C3-Symmetric Azo Dyes: Azo−Hydrazone Tautomerism, Conformational Switching, and Application for Chemical Sensing


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Torsionally Responsive C3-Symmetric Azo Dyes: Azo−Hydrazone Tautomerism, Conformational Switching, and Application for Chemical Sensing

Journal of the American Chemical Society, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable).


B

Directly Pd(II)-Bridged Porphyrin Belts with Remarkable Curvatures


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Directly Pd(II)-Bridged Porphyrin Belts with Remarkable Curvatures

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Position-Specific Secondary Deuterium Isotope Effects on Basicity of Pyridine


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Position-Specific Secondary Deuterium Isotope Effects on Basicity of Pyridine

Journal of the American Chemical Society, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable).


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The layered topology of a five components melaminium-melamine hybrid salt of a functional gold(iii) dithiolene complex


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The layered topology of a five components melaminium-melamine hybrid salt of a functional gold(iii) dithiolene complex


Anupama Ranganathan, Abdelkrim El-Ghayoury, Leokadiya Zorina, Patrick Batail

(Paper from CrystEngComm)

Anupama Ranganathan, CrystEngComm, 2010, DOI: 10.1039/c0ce00188k

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Supramolecular architectures formed by co-crystallization of bile acids and melamine


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Supramolecular architectures formed by co-crystallization of bile acids and melamine


Satu Ikonen, Nonappa, Erkki Kolehmainen

(Paper from CrystEngComm)

Satu Ikonen, CrystEngComm, 2010, DOI: 10.1039/c0ce00108b

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Remarkable reversal of melting point alternation by co-crystallization


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Remarkable reversal of melting point alternation by co-crystallization


Dario Braga, Elena Dichiarante, Giuseppe Palladino, Fabrizia Grepioni, Michele R. Chierotti, Roberto Gobetto, Luca Pellegrino

(Communication from CrystEngComm)

Dario Braga, CrystEngComm, 2010, DOI: 10.1039/c0ce00253d

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Modification at a boron unit: tuning electronic and optical properties of [small pi]-conjugated acyclic anion receptors


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Modification at a boron unit: tuning electronic and optical properties of [small pi]-conjugated acyclic anion receptors


Hiromitsu Maeda, Mayumi Takayama, Kazuki Kobayashi, Hideyuki Shinmori

(Paper from Org. Biomol. Chem.)

Hiromitsu Maeda, Org. Biomol. Chem., 2010, DOI: 10.1039/c0ob00044b

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Pyrrolizine-1,3-dione


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Pyrrolizine-1,3-dione


Hamish McNab, James Montgomery, Simon Parsons, David G. Tredgett

(Paper from Org. Biomol. Chem.)

Hamish McNab, Org. Biomol. Chem., 2010, DOI: 10.1039/c0ob00116c

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A highly sensitive, selective, colorimetric and near-infrared fluorescent turn-on chemosensor for Cu2+ based on BODIPY


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A highly sensitive, selective, colorimetric and near-infrared fluorescent turn-on chemosensor for Cu2+ based on BODIPY


Shouchun Yin, Volker Leen, Sven Van Snick, Noel Boens, Wim Dehaen

(Communication from Chem. Commun.)

Shouchun Yin, Chem. Commun., 2010, DOI: 10.1039/c0cc01772h

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Strong ferromagnetic metal-ligand exchange in a nickel bis(3,5-dipyridylverdazyl) complex


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Strong ferromagnetic metal-ligand exchange in a nickel bis(3,5-dipyridylverdazyl) complex


David J. R. Brook, Cardius J. Richardson, Benjamin C. Haller, Michael Hundley, Gordon T. Yee

(Communication from Chem. Commun.)

David J. R. Brook, Chem. Commun., 2010, DOI: 10.1039/c0cc02233k

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czwartek, 5 sierpnia 2010

Designed Molecular Switches: Controlling the Conformation of Benzamido-diphe...

 
 

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przez Organic Letters: Latest Articles (ACS Publications) autor: Ian M. Jones et al dnia 10-07-29

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Enol Tautomers of Watson−Crick Base Pair Models Are Metastable Because of Nu...

 
 

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przez Journal of the American Chemical Society: Latest Articles (ACS Publications) autor: Alejandro Pérez et al dnia 10-08-03

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