Isolation and oxidation-reduction of methylviologen cation radicals. Novel disproportionation in charge-transfer salts by x-ray crystallography

1990 ◽  
Vol 55 (13) ◽  
pp. 4127-4135 ◽  
Author(s):  
T. M. Bockman ◽  
J. K. Kochi
Keyword(s):  
Charge Transfer ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cation Radicals ◽  
Oxidation Reduction ◽  
Charge Transfer Salts

scholarly journals Isolation of a chiral anthracene cation radical: X-ray crystallography and computational interrogation of its racemization

2017 ◽  
Vol 53 (18) ◽  
pp. 2748-2751 ◽  
Author(s):  
Maxim V. Ivanov ◽  
Khushabu Thakur ◽  
Anshul Bhatnagar ◽  
Rajendra Rathore
Keyword(s):  
Charge Transfer ◽  
Dft Calculations ◽  
Cation Radical ◽  
Enantioselective Synthesis ◽  
X Ray ◽  
X Ray Crystallography ◽  
Anthracene Derivative ◽  
Cation Radicals ◽  
Radical Salt ◽  
Charge Transfer Materials

Chiral cation-radicals hold significant promise as charge-transfer materials, chiroptical switches, and catalysts for enantioselective synthesis. Herein we identify a chiral anthracene derivative that forms a robust cation-radical salt as established by X-ray crystallography and DFT calculations.

The Characterization Of Organic Charge Transfer Superconductors By Microreflectance Spectroscopy

1990 ◽  
Vol 48 (2) ◽  
pp. 272-273
Author(s):  
S. L. Hill ◽  
K. Krishnan ◽  
J. R. Ferraro
Keyword(s):  
Charge Transfer ◽  
Single Crystal ◽  
Beta Phase ◽  
Alpha Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Crystallography ◽  
A Value ◽  
Charge Transfer Salts

Certain classes of organic charge-transfer salts demonstrate superconducting behavior at liquid helium temperatures. Single crystal x-ray diffraction and infrared microreflectance analysis have been performed on several conducting systems to associate the nature of the crystalline structure with the electrical conductivity. The infrared spectrum for a single crystal salt exhibits absorptions which correlate with superconducting behavior.Discussion Williams and coworkers have performed x-ray Crystallography experiments to demonstrate the presence of an anion cavity between radical cation stacks- of bis(ethylenedithio)- tetrathiafulvalene (ET). The sulfur…sulfur interstack distance in a beta or kappa phase salt assumes a value less than the Vanderwaals distance and exhibit a superconducting (two dimensional) metal behavior (verified by Fermi surface calculations) at 1-20K. The structures of alpha and beta phase ET2I3 suggest the potential for several potential intermolecular interaction modes. It may be observed that the beta phase permits both interstack as well as H … X anionic interactions, whereas these interactions are less likely to occur in the alpha phase.

X-ray diffuse scattering as precursor of incommensurate Peierls transitions in one-dimensional organic charge transfer conductors

2004 ◽  
Vol 219 (11) ◽  
Author(s):  
Jean-Paul Pouget
Keyword(s):  
Charge Transfer ◽  
Charge Density Wave ◽  
Diffuse Scattering ◽  
Lattice Distortion ◽  
Density Wave ◽  
Periodic Lattice ◽  
One Dimensional ◽  
X Ray ◽  
Charge Transfer Salts ◽  
A Charge

AbstractQuasi-one dimensional (1D) conductors of the TTF-TCNQ family of charge transfer salts exhibit a Peierls transition which stabilizes a periodic lattice distortion (PLD), accompanied by a charge density wave (CDW) modulation, with an incommensurate 2

Charge-transfer salts with mononuclear and dinuclear ylide gold(I) complexes: x-ray structure of [Au(CH2PPh3)2](TCNQ) (TCNQ = 7,7′,8,8′-tetracyanoquinodimethane)

1996 ◽  
Vol 506 (1-2) ◽  
pp. 203-210 ◽  
Author(s):  
Elena Cerrada ◽  
M. Concepción Gimeno ◽  
Antonio Laguna ◽  
Mariano Laguna ◽  
Victor Orera ◽  
...  
Keyword(s):  
Charge Transfer ◽  
X Ray ◽  
Charge Transfer Salts

Vicinal-diaryl interactions in stilbenoid hydrocarbons as observed in the through-space charge delocalization of their cation radicals

1999 ◽  
Vol 77 (5-6) ◽  
pp. 913-921 ◽  
Author(s):  
Rajendra Rathore ◽  
Jay K Kochi
Keyword(s):  
Space Charge ◽  
Cation Radical ◽  
Conformational Preference ◽  
Charge Delocalization ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cation Radicals ◽  
Near Ir ◽  
Aromatic Interactions ◽  
Vis Spectroscopy

The conformational preference of vicinal or 1,2-phenyl groups is probed in two classes of ring-substituted 1,2-diphenylbicyclooctene (stilbenoid) hydrocarbons 1a-1d and 2a-2c. UV-vis spectroscopy reveals, and X-ray crystallography verifies, the intramolecular (edge-to-face) orientation for the phenyl-phenyl interaction in stilbenoids 1a-1d. Most importantly, when two pairs of ortho-methyl substituents are present, the cofacial phenyl groups in the stilbenoid donors are established by X-ray crystallography and spectrally observed in the cation radicals (2a+.-2c+.) by the appearance of new bands with strong absorptions in the near IR with λmax = 1100-1315 nm, analogous to those previously observed in intermolecular (aromatic) interactions of aromatic cation radicals.Key words: stilbenoid hydrocarbon, cation radical, aryl-aryl interaction.

scholarly journals Crystal Structures and Optical Properties of Two Novel 1,3,5-Trisubstituted Pyrazoline Derivatives

Crystals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 467
Author(s):  
Qi Feng ◽  
Wenhui Huan ◽  
Jiali Wang ◽  
Jiadan Lu ◽  
Guowang Diao ◽  
...  
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Solid State ◽  
Physical Properties ◽  
Intramolecular Charge Transfer ◽  
Solvent Polarity ◽  
Dihedral Angles ◽  
Polar Solvents ◽  
X Ray ◽  
X Ray Crystallography

Two novel 1,3,5-trisubstituted pyrazoline derivatives—1-acetyl-3-(4-methoxyphenyl)-5-(6-methoxy-2-naphthyl)-pyrazoline (2a) and 1-(4-nitrophenyl)-3-(4-methoxyphenyl)-5-(6-methoxy-2-naphtyl)-pyrazoline (2b)—were synthesized and their structures were determined by single crystal X-ray crystallography. Both of the two crystals exhibit twisted structures due to the large dihedral angles between the pyrazolinyl ring and the aromatic ring at the 5-position (88.09° for 2a and 71.26° for 2b). The optical–physical properties of the two compounds were investigated. The fluorescent emission of 2b arises from the 1,3-disubstituted pyrazoline chromophores and exhibits a red shift in polar solvents and solid-state, which could be attributed to photo-induced intramolecular charge transfer (ICT) from N1 to C3 in the pyrazoline moiety and the intermolecular interactions within the crystal. The fluorescent emissions of 2a (λmax 358–364 nm) in solvents and solid-state both come from 6-methoxy-2-naphthyl chromophores, which are fairly insensitive to the solvent polarity.

A new family of charge transfer salts formed with the π-electron donor bet-ttf and reo4−. synthesis, x-ray structure and physical properties

1999 ◽  
Vol 102 (1-3) ◽  
pp. 1707-1708 ◽  
Author(s):  
A. Pérez-Benítez ◽  
C. Rovira ◽  
J. Veciana ◽  
J. Vidal-Gancedo ◽  
V.N. Laukhin ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Physical Properties ◽  
Electron Donor ◽  
X Ray ◽  
New Family ◽  
Charge Transfer Salts

CHARGE-TRANSFER REACTION OF BUTATRIENE: FORMATION OF DIHYDRONAPHTHALENE DERIVATIVE

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4619-4624 ◽  
Author(s):  
NAZRUL ISLAM ◽  
MASAO TSUKAYAMA ◽  
YASUHIKO KAWAMURA
Keyword(s):  
Charge Transfer ◽  
Room Temperature ◽  
Transfer Reaction ◽  
Addition Reaction ◽  
Crystalline Material ◽  
Charge Transfer Reaction ◽  
Protic Solvent ◽  
Detailed Structure ◽  
X Ray ◽  
X Ray Crystallography

The charge-transfer reaction of tetraarylbutatriene 1 with tetracyanoethene (TCNE) in dichloromethane at room temperature was studied and we found a novel addition reaction. A red crystalline material 2 was isolated as an intermediate product which is converted slowly into dihydronaphthalene derivative 3 in dichloromethane but rapidly in protic solvent. The structure of the compounds was determined by X-ray crystallography. The detailed structure and the plausible reaction mechanism have also been discussed.

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