środa, 19 sierpnia 2009

Diels−Alder Reaction between Cyclopentadiene and C60: An Analysis of the Per...

 
 

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Electronic Structure and Stability of Benzotriazoles

 
 

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

 
 

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Excited States of DNA Base Pairs Using Long-Range Corrected Time-Dependent D...

 
 

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Qualitative Study of Substituent Effects on NMR 15N and 17O Chemical Shifts

 
 

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przez The Journal of Physical Chemistry A: Latest Articles (ACS Publications) autor: Rubén H. Contreras et al dnia 09-08-17

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wtorek, 18 sierpnia 2009

Metal-free hydrogen activation and hydrogenation of imines by 1,8-bis(dipent...

 
 

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przez RSC - Chem. Commun. latest articles autor: Heinz Berke dnia 09-08-17

Chunfang Jiang, Olivier Blacque, Heinz Berke
(Communication from Chem. Commun.)
Chunfang Jiang, Chem. Commun., 2009, DOI: 10.1039/b909620e
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Restricted active space spin-flip configuration interaction approach: theory...

 
 

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przez RSC - Phys. Chem. Chem. Phys. latest articles autor: Martin Head-Gordon dnia 09-08-18

David Casanova, Martin Head-Gordon
(Paper from Phys. Chem. Chem. Phys.)
David Casanova, Phys. Chem. Chem. Phys., 2009, DOI: 10.1039/b911513g
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Binding of the terephthalate dianion by di- tri- and tetrathiourea functiona...

 
 

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przez RSC - Org. Biomol. Chem. latest articles autor: Frederick M. Pfeffer dnia 09-08-17

Adam J. Lowe, Frederick M. Pfeffer
(Paper from Org. Biomol. Chem.)
Adam J. Lowe, Org. Biomol. Chem., 2009, DOI: 10.1039/b910522k
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“Wurster-Type” Ureas as Redox-Active Receptors for Anions

 
 

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przez The Journal of Organic Chemistry: Latest Articles (ACS Publications) autor: John P. Clare et al dnia 09-08-06

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Isoquinoline Synthesis via Rhodium-Catalyzed Oxidative Cross-Coupling/Cycliz...

 
 

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Heme Regulation of Human Cystathionine β-Synthase Activity: Insights from Fl...

 
 

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Noncovalent Synthesis of Shape-Persistent Cyclic Hexamers from Ditopic Hydra...

 
 

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Journey from Mo−Mo Quadruple Bonds to Quintuple Bonds

 
 

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poniedziałek, 17 sierpnia 2009

Jahn-Teller Effects in Molecular Cations Studied by Photoelectron Spectroscopy and Group Theory


Jahn-Teller Effects in Molecular Cations Studied by Photoelectron Spectroscopy and Group Theory

The traditional "ball-and-stick" concept of molecular structure fails when the motion of the electrons is coupled to that of the nuclei. Such a situation arises in the Jahn-Teller (JT) effect which is very common in open-shell molecular systems, such as radicals or ions. The JT effect is well known to chemists as a mechanism that causes the distortion of an otherwise symmetric system. Its implications on the dynamics of molecules still represent unsolved problems in many cases. Herein we review recent progress in understanding the dynamic structure of molecular cations that have a high permutational symmetry by using rotationally resolved photoelectron spectroscopy and group theory. Specifically, we show how the pseudo-Jahn-Teller effect in the cyclopentadienyl cation causes electronic localization and nuclear delocalization. The fundamental physical mechanisms underlying the vaguely defined concept of "antiaromaticity" are thereby elucidated. Our investigation of the methane cation represents the first experimental characterization of the JT effect in a threefold degenerate electronic state. A special kind of isomerism resulting from the JT effect has been discovered and is predicted to exist in all JT systems in which the minima on the potential-energy surface are separated by substantial barriers.


B

The hydrogen bond: a molecular beam microwave spectroscopist's view with a universal appeal


The hydrogen bond: a molecular beam microwave spectroscopist's view with a universal appeal


Mausumi Goswami, E. Arunan

(Perspective from Phys. Chem. Chem. Phys.)

Mausumi Goswami, Phys. Chem. Chem. Phys., 2009, DOI: 10.1039/b907708a

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N-(Acetamido)thiourea based simple neutral hydrogen-bonding receptors for anions


N-(Acetamido)thiourea based simple neutral hydrogen-bonding receptors for anions


Wen-Xia Liu, Rui Yang, Ai-Fang Li, Zhao Li, Yu-Feng Gao, Xing-Xing Luo, Yi-Bin Ruan, Yun-Bao Jiang

(Paper from Org. Biomol. Chem.)

Wen-Xia Liu, Org. Biomol. Chem., 2009, DOI: 10.1039/b910255h

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Tautomerism of guanidines studied by 15N NMR: 2-hydrazono-3-phenylquinazolin-4(3H)-ones and related compounds


Tautomerism of guanidines studied by 15N NMR: 2-hydrazono-3-phenylquinazolin-4(3H)-ones and related compounds


Ion Ghiviriga, Bahaa El-Dien M. El-Gendy, Peter J. Steel, Alan R. Katritzky

(Paper from Org. Biomol. Chem.)

Ion Ghiviriga, Org. Biomol. Chem., 2009, DOI: 10.1039/b907577a

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poniedziałek, 3 sierpnia 2009

Nickel(0)-catalyzed [2 + 2 + 2] cycloaddition of diynes and 3,4-pyridynes: n...

 
 

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przez RSC - Chem. Commun. latest articles autor: Yoshihiro Sato dnia 09-08-03

Toshihiko Iwayama, Yoshihiro Sato
(Communication from Chem. Commun.)
Toshihiko Iwayama, Chem. Commun., 2009, DOI: 10.1039/b912022j
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Anthracene-based open and macrocyclic receptors in the flurometric detection...

 
 

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przez RSC - New J. Chem. latest articles autor: Goutam Masanta dnia 09-07-15

Kumaresh Ghosh, Goutam Masanta
(Paper from New J. Chem.)
Kumaresh Ghosh, New J. Chem., 2009, DOI: 10.1039/b909536e
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NMR and DFT study on media effects on proton transfer in hydrogen bonding: c...

 
 

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przez RSC - Phys. Chem. Chem. Phys. latest articles autor: Kestutis Aidas dnia 09-07-27

Vytautas Balevicius, Zofia Gdaniec, Kestutis Aidas
(Paper from Phys. Chem. Chem. Phys.)
Vytautas Balevicius, Phys. Chem. Chem. Phys., 2009, DOI: 10.1039/b819666d
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Boiling water-catalyzed neutral and selective N-Boc deprotection

 
 

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przez RSC - Chem. Commun. latest articles autor: Jin Qu dnia 09-07-31

Jia Wang, Yan-Liang Liang, Jin Qu
(Communication from Chem. Commun.)
Jia Wang, Chem. Commun., 2009, DOI: 10.1039/b910239f
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Internal Return of Carbon Dioxide in Decarboxylation: Catalysis of Separatio...

 
 

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przez Journal of the American Chemical Society: Latest Articles (ACS Publications) autor: Scott O. C. Mundle et al dnia 09-07-30

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Decarboxylation via Addition of Water to a Carboxyl Group: Acid Catalysis of...

 
 

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przez Journal of the American Chemical Society: Latest Articles (ACS Publications) autor: Scott O. C. Mundle et al dnia 09-07-31

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