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Title: Importance of intermolecular hydrogen. hydrogen and hydrogen. anion contacts for the lattice softness, the electron-phonon coupling, and the superconducting transition temperatures, T/sub c/, of organic conducting salts. beta. -(ET)/sub 2/X (X/sup -/ = IBr/sub 2//sup -/, AuI/sub 2//sup -/, I/sub 3//sup -/). [ET = bis(ethylenedithio)tetrathiafulvalene]

Abstract

On the basis of the crystal structures of ..beta..-(ET)/sub 2/X (X/sup -/ = IBr/sub 2//sup -/, AuI/sub 2//sup -/, I/sub 3//sup -/) determined at low temperature under ambient and applied pressure, they examined the structural factors responsible for the occurrence of the structural modulation in ..beta..-(ET)/sub 2/I/sub 3/ under ambient pressure, its disappearance under pressure greater than approx. 0.5 kbar, and its effect on the superconducting transition temperature T/sub c/ and the dependence of T/sub c/ on anion X/sup -/ in ..beta..-(ET)/sub 2/X. ET is an abbreviation for BEDT-TTF, i.e., bis(ethylenedithio)tetrathiafulvalene. The electron-phonon coupling constants, lambda, calculated for ..beta..-(ET)/sub 2/X on the basis of the McMillan equation suggest that the lattice softness with respect to translational and/or librational modes of vibration increases in the order ..beta..-(ET)/sub 2/I/sub 3/ < ..beta..-(ET)/sub 2/IBr/sub 2/ < ..beta..-(ET)/sub 2/AuI/sub 2/ < ..beta..*-(ET)/sub 2/I/sub 3/, where ..beta..*-(ET)/sub 2/I/sub 3/ refers to the ..beta..-(ET)/sub 2/I/sub 3/ salt under an applied pressure greater than approx. 0.5 kbar with T/sub c/ similarly ordered 8 K. They also discuss the importance of hydrogen...anion interactions in understanding the lower T/sub c/ values (1-1.5 K) of the other class of organic superconductors (TMTSF)/sub 2/X (X/sup -/ = ClO/sub 4//sup -/, PF/submore » 6//sup -/) compared to the ..beta..-(ET)/sub 2/X systems and the implications concerning the synthesis of new organic superconductors.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
North Carolina State Univ., Raleigh
OSTI Identifier:
6874500
DOE Contract Number:  
W-31-109-ENG-38; FG05-86ER45259
Resource Type:
Journal Article
Journal Name:
J. Am. Chem. Soc.; (United States)
Additional Journal Information:
Journal Volume: 109:1
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; GOLD IODIDES; CRYSTAL LATTICES; ELECTRON-PHONON COUPLING; TRANSITION TEMPERATURE; IODIDES; IODINE BROMIDES; ORGANIC COMPOUNDS; CHEMICAL BONDS; EXPERIMENTAL DATA; HYDROGEN; SUPERCONDUCTIVITY; ULTRALOW TEMPERATURE; BROMIDES; BROMINE COMPOUNDS; CRYSTAL STRUCTURE; DATA; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTS; GOLD COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; INFORMATION; IODINE COMPOUNDS; NONMETALS; NUMERICAL DATA; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; 400201* - Chemical & Physicochemical Properties

Citation Formats

Whangbo, M, Williams, J M, Schultz, A J, Emge, T J, and Beno, M A. Importance of intermolecular hydrogen. hydrogen and hydrogen. anion contacts for the lattice softness, the electron-phonon coupling, and the superconducting transition temperatures, T/sub c/, of organic conducting salts. beta. -(ET)/sub 2/X (X/sup -/ = IBr/sub 2//sup -/, AuI/sub 2//sup -/, I/sub 3//sup -/). [ET = bis(ethylenedithio)tetrathiafulvalene]. United States: N. p., 1987. Web. doi:10.1021/ja00235a014.
Whangbo, M, Williams, J M, Schultz, A J, Emge, T J, & Beno, M A. Importance of intermolecular hydrogen. hydrogen and hydrogen. anion contacts for the lattice softness, the electron-phonon coupling, and the superconducting transition temperatures, T/sub c/, of organic conducting salts. beta. -(ET)/sub 2/X (X/sup -/ = IBr/sub 2//sup -/, AuI/sub 2//sup -/, I/sub 3//sup -/). [ET = bis(ethylenedithio)tetrathiafulvalene]. United States. https://doi.org/10.1021/ja00235a014
Whangbo, M, Williams, J M, Schultz, A J, Emge, T J, and Beno, M A. Wed . "Importance of intermolecular hydrogen. hydrogen and hydrogen. anion contacts for the lattice softness, the electron-phonon coupling, and the superconducting transition temperatures, T/sub c/, of organic conducting salts. beta. -(ET)/sub 2/X (X/sup -/ = IBr/sub 2//sup -/, AuI/sub 2//sup -/, I/sub 3//sup -/). [ET = bis(ethylenedithio)tetrathiafulvalene]". United States. https://doi.org/10.1021/ja00235a014.
@article{osti_6874500,
title = {Importance of intermolecular hydrogen. hydrogen and hydrogen. anion contacts for the lattice softness, the electron-phonon coupling, and the superconducting transition temperatures, T/sub c/, of organic conducting salts. beta. -(ET)/sub 2/X (X/sup -/ = IBr/sub 2//sup -/, AuI/sub 2//sup -/, I/sub 3//sup -/). [ET = bis(ethylenedithio)tetrathiafulvalene]},
author = {Whangbo, M and Williams, J M and Schultz, A J and Emge, T J and Beno, M A},
abstractNote = {On the basis of the crystal structures of ..beta..-(ET)/sub 2/X (X/sup -/ = IBr/sub 2//sup -/, AuI/sub 2//sup -/, I/sub 3//sup -/) determined at low temperature under ambient and applied pressure, they examined the structural factors responsible for the occurrence of the structural modulation in ..beta..-(ET)/sub 2/I/sub 3/ under ambient pressure, its disappearance under pressure greater than approx. 0.5 kbar, and its effect on the superconducting transition temperature T/sub c/ and the dependence of T/sub c/ on anion X/sup -/ in ..beta..-(ET)/sub 2/X. ET is an abbreviation for BEDT-TTF, i.e., bis(ethylenedithio)tetrathiafulvalene. The electron-phonon coupling constants, lambda, calculated for ..beta..-(ET)/sub 2/X on the basis of the McMillan equation suggest that the lattice softness with respect to translational and/or librational modes of vibration increases in the order ..beta..-(ET)/sub 2/I/sub 3/ < ..beta..-(ET)/sub 2/IBr/sub 2/ < ..beta..-(ET)/sub 2/AuI/sub 2/ < ..beta..*-(ET)/sub 2/I/sub 3/, where ..beta..*-(ET)/sub 2/I/sub 3/ refers to the ..beta..-(ET)/sub 2/I/sub 3/ salt under an applied pressure greater than approx. 0.5 kbar with T/sub c/ similarly ordered 8 K. They also discuss the importance of hydrogen...anion interactions in understanding the lower T/sub c/ values (1-1.5 K) of the other class of organic superconductors (TMTSF)/sub 2/X (X/sup -/ = ClO/sub 4//sup -/, PF/sub 6//sup -/) compared to the ..beta..-(ET)/sub 2/X systems and the implications concerning the synthesis of new organic superconductors.},
doi = {10.1021/ja00235a014},
url = {https://www.osti.gov/biblio/6874500}, journal = {J. Am. Chem. Soc.; (United States)},
number = ,
volume = 109:1,
place = {United States},
year = {1987},
month = {1}
}