scholarly journals Tetrathiafulvalene-Tetracyanoquinodimethane Charge-Transfer Complexes Wired to Carbon Surfaces: Tuning of the Degree of Charge Transfer

2016 ◽  
Vol 120 (49) ◽  
pp. 28021-28030 ◽  
Author(s):  
Joanna Jalkh ◽  
Yann R. Leroux ◽  
Antoine Vacher ◽  
Dominique Lorcy ◽  
Philippe Hapiot ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Carbon Surfaces ◽  
Degree Of Charge Transfer

Crystal growth and characterization of solvated organic charge-transfer complexes built on TTF and 9-dicyanomethylenefluorene derivatives

CrystEngComm ◽  
2015 ◽  
Vol 17 (32) ◽  
pp. 6227-6235 ◽  
Author(s):  
Amparo Salmerón-Valverde ◽  
Sylvain Bernès
Keyword(s):  
Charge Transfer ◽  
Crystal Growth ◽  
Charge Transfer Complexes ◽  
Organic Complexes ◽  
Donor Acceptor ◽  
Degree Of Charge Transfer

A series of solvated donor–acceptor organic complexes were shown to slowly release the lattice solvent while the degree of charge transfer decreases steadily. This behavior is not observed in the case of a hydrate.

Vibrational spectra of two new organic semiconductors: tetrathiafulvalene (TTF) and tetramethyltetraselenafulvalene (TMTSF) salts of paranitrophenylmalononitrile (PNMA)

1991 ◽  
Vol 69 (5) ◽  
pp. 901-907 ◽  
Author(s):  
K. D. Truong ◽  
A. D. Bandrauk ◽  
J. ZAUHAR ◽  
C. Carlose
Keyword(s):  
Raman Spectroscopy ◽  
Charge Transfer ◽  
Organic Semiconductors ◽  
Vibrational Spectra ◽  
Electron Distribution ◽  
Charge Transfer Complexes ◽  
Strong Electron ◽  
Ir And Raman ◽  
Degree Of Charge Transfer ◽  
Ftir And Raman Spectroscopy

Two new complexes of stoichiometry 2:1 are reported for the donors tetrathiafulvalene (TTF) and tetramethyltetraselenafulvalene (TMTSF) with the acceptor paranitrophenylmalononitrile (PNPMA). Both compounds are semiconductors with a resistivity of about 4 × 10−4 Ω m for (TMTSF)2PNPMA and 0.58 Ω m for (TTF)2PNPMA. The larger conductivity of the first complex can be attributed to the disorder of the PNPMA anions. Vibrational spectra were obtained by FTIR and Raman spectroscopy, in order to determine the degree of charge transfer in these systems. Both complexes have the electron distribution (D+0.4)2A−0.8. As a result the donors D stack in tetramerized units and exhibit vibronic activation of certain symmetric monomer modes, thus indicating the presence of strong electron–vibrational interactions in the donor stacks. Key words: TTF and TMTSF salts, charge transfer complexes, IR and Raman spectra, degree of charge transfer, paranitrophenylmalononitrile (PNPMA).

Synthesis and structures of 11,11,12,12-tetracyano-2,6-diiodo-9,10-anthraquinodimethane and its 2:1 cocrystals with anthracene, pyrene and tetrathiafulvalene

2016 ◽  
Vol 72 (12) ◽  
pp. 923-931 ◽  
Author(s):  
Yi Ren ◽  
Semin Lee ◽  
Jeffery Bertke ◽  
Danielle L. Gray ◽  
Jeffrey S. Moore
Keyword(s):  
Molecular Structure ◽  
Charge Transfer ◽  
Electron Donors ◽  
Dihedral Angles ◽  
Charge Transfer Complexes ◽  
Central Ring ◽  
The Family ◽  
Benzene Rings ◽  
Saddle Shape ◽  
Degree Of Charge Transfer

Radical salts and charge-transfer complexes (CTCs) containing tetracyanoquinodimethane (TCNQ) display electrical conductivity, which has led to the development of many TCNQ derivatives with enhanced electron-accepting properties that are applicable toward organic electronics. To expand the family of TCNQ derivatives, we report the synthesis and structures of 11,11,12,12-tetracyano-2,6-diiodo-9,10-anthraquinodimethane (abbreviated as DITCAQ), C20H6I2N4, and its charge-transfer complexes with various electron donors, namely DITCAQ–anthracene (2/1), C20H6I2N4·0.5C14H10, (I), DITCAQ–pyrene (2/1), C20H6I2N4·0.5C16H10, (II), and DITCAQ–tetrathiafulvalene (2/1), C20H6I2N4·0.5C6H4S4, (III). The molecular structure of DITCAQ consists of a 2,6-diiodo-9,10-dihydroanthracene moiety with two malononitrile substituents. DITCAQ possesses a saddle shape, since the malononitrile groups bend significantly up out of the plane of the central ring and the two benzene rings bend down out of the same plane. π–π interactions between DITCAQ and the electron-donor molecules control the degree of charge transfer in cocrystals (I), (II), and (III), which is reflected in both the dihedral angles between the terminal benzene ring and the central ring on the DITCAQ motifs, and their corresponding IR spectra.

scholarly journals Crystal structures of two charge–transfer complexes of benzo[1,2-c:3,4-c′:5,6-c′′]trithiophene (D 3h -BTT)

2019 ◽  
Vol 75 (10) ◽  
pp. 1573-1577 ◽  
Author(s):  
Qian Qin ◽  
Joel T. Mague ◽  
Haley E. Gould ◽  
Samuel E. Vasquez ◽  
Anthony E. Heyer
Keyword(s):  
Charge Transfer ◽  
Crystal Structures ◽  
Electron Donor ◽  
Charge Transfer Complexes ◽  
Central Ring ◽  
Two Component ◽  
Mixed Layers ◽  
Degree Of Charge Transfer

Benzo[1,2-c:3,4-c′:5,6-c′′]trithiophene (D 3h -BTT) is an easily prepared electron donor that readily forms charge–transfer complexes with organic acceptors. We report here two crystal structures of its charge–transfer complexes with 7,7,8,8-tetracyanoquinodimethane (TCNQ) and buckminsterfullerene (C60). The D 3h -BTT·TCNQ complex, C12H6S3·C12H4N4, crystallizes with mixed layers of donors and acceptors, with an estimated degree of charge transfer at 0.09 e. In the D 3h -BTT·C60·toluene complex, C12H6S3·C60·C7H8, the central ring of BTT is `squeezed' by the C60 molecules from both faces. However, the degree of charge transfer is low. The C60 unit is disordered over two sites in a 0.766 (3):0.234 (3) ratio and was refined as a two-component inversion twin.

Magnetic properties of new charge-transfer complexes based on manganese porphyrins

1997 ◽  
Vol 90 (3) ◽  
pp. 407-413
Author(s):  
MARC KELEMEN ◽  
CHRISTOPH WACHTER ◽  
HUBERT WINTER ◽  
ELMAR DORMANN ◽  
RUDOLF GOMPPER ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Manganese Porphyrins

Charge Transfer Complexation Boosts Molecular Conductance Through Fermi Level Pinning

2018 ◽  
Author(s):  
Kun Wang ◽  
Andrea Vezzoli ◽  
Iain Grace ◽  
Maeve McLaughlin ◽  
Richard Nichols ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Single Molecule ◽  
Quantum Interference ◽  
Transmission Function ◽  
Scanning Tunneling ◽  
Charge Transfer Complexes ◽  
Tunneling Microscopy ◽  
Quantum Interference Effect ◽  
Single Molecule Junctions ◽  
Charge Transfer Complexation

We have used scanning tunneling microscopy to create and study single molecule junctions with thioether-terminated oligothiophene molecules. We find that the conductance of these junctions increases upon formation of charge transfer complexes of the molecules with tetracyanoethene, and that the extent of the conductance increase is greater the longer is the oligothiophene, i.e. the lower is the conductance of the uncomplexed molecule in the junction. We use non-equilibrium Green's function transport calculations to explore the reasons for this theoretically, and find that new resonances appear in the transmission function, pinned close to the Fermi energy of the contacts, as a consequence of the charge transfer interaction. This is an example of a room temperature quantum interference effect, which in this case boosts junction conductance in contrast to earlier observations of QI that result in diminished conductance.<br>

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