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Effect of Halopyridine Guest Molecules on the Structure and Superconducting Properties of β″‐[Bis(ethylenedithio)tetrathiafulvalene] 4 (H 3 O)[Fe(C 2 O 4 ) 3 ]·Guest Crystals
Author(s) -
Prokhorova Tatiana G.,
Buravov Lev I.,
Yagubskii Eduard B.,
Zorina Leokadiya V.,
Simonov Sergey V.,
Zverev Vladimir N.,
Shibaeva Rimma P.,
Canadell Enric
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201501092
Subject(s) - tetrathiafulvalene , monoclinic crystal system , chemistry , triclinic crystal system , crystallography , superconductivity , crystal structure , molecule , tetra , condensed matter physics , organic chemistry , medicinal chemistry , physics
Four new superconducting and metallic salts of the family of organic molecular conductors (BEDT‐TTF) 4 A I [Fe III (C 2 O 4 ) 3 ]G [A = H 3 O + ; G = 2‐chloropyridine ( 1 ), 2‐bromopyridine ( 2 ), 3‐chloropyridine ( 3 ), and 3‐bromopyridine ( 4 ); BEDT‐TTF = bis(ethylenedithio)tetrathiafulvalene] have been prepared, and their crystal structures, electronic structures, transport properties, and magnetotransport properties have been studied. All of the crystals obtained belong to the monoclinic group of the family with β″‐type packing of the conducting BEDT‐TTF layers. Crystals 1 and 2 are superconductors with T c = 2.4–4.0 and 4.3 K, respectively, and possess structural phase transitions from monoclinic to triclinic symmetry at temperatures of 190–215 K, whereas 3 and 4 retain monoclinic symmetry at 90–300 K and do not show a superconducting transition above 0.5 K. Shubnikov–de Haas (SdH) oscillations were found in crystals of 1 , 2 , and 4 . The structures and conducting properties of 1 – 4 are compared with those of the known monoclinic phases of the family containing Fe III ions and different monohalobenzenes and pyridine as “guest” solvent molecules (G).