New organic conductors with iodine cobalt bis(dicarbollide) anions
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CAJEVA, O.; ALEKSANDROV, Grigorii; KRAVCHENKO, Andrey; KOSENKO, Irina; LOBANOVA, Irina; SIVAEV, Igor; BREGADZE, Vladimir; STARODUB, Vladimir; DYACHENKO, Oleg. New organic conductors with iodine cobalt bis(dicarbollide) anions. In: Materials Science and Condensed Matter Physics. Editia a 6-a, 11-14 septembrie 2012, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2012, p. 67. ISBN 978-9975-66-290-1.
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Materials Science and Condensed Matter Physics
Editia a 6-a, 2012
Conferința "Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 11-14 septembrie 2012

New organic conductors with iodine cobalt bis(dicarbollide) anions


Pag. 67-67

Cajeva O.1, Aleksandrov Grigorii2, Kravchenko Andrey3, Kosenko Irina4, Lobanova Irina4, Sivaev Igor4, Bregadze Vladimir4, Starodub Vladimir3, Dyachenko Oleg1
 
1 Institute of Problems of Chemical Physics, Russian Academy of Sciences,
2 Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences(IGIC RAS),
3 V.N.Karazin Kharkiv Natsonal University, Kharkiv,
4 A.N.Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences
 
Disponibil în IBN: 6 martie 2020


Rezumat

Radical cation salts and charge transfer complexes based on tetrathiafulvalene (TTF) and their derivatives constitute a wide class of organic materials with transport properties ranging from insulating to superconducting. The iron group metal bis(1,2-dicarbollide) complexes [3,3’-M(1,2C2B9H11)2]- (M = Fe, Co, Ni) have been proposed as counterions for synthesis of new radical cation-based molecular materials. Substitution of hydrogen atoms in these complexes for various atoms and groups opens practically unlimited perspectives of their modificationformulaIn this report we describe synthesis, crystal structure and electrical conductivity of tetrathiafulvalene salts of iodine derivatives of cobalt bis(dicarbollide) anion: (ET)[9,9’(12’)-I23,3’-Co(1,2-C2B9H10)2] (1), (TTF)[9,9’,12,12’-I4-3,3’-Co(1,2-C2B9H9)2] (2), (TTF)[8,8’-I2-3,3’Co(1,2-C2B9H10)2] (3), (BMDT)4[8,8’-I2-3,3’-Co(1,2-C2B9H10)2] (4), and (ET)2[8,8’-I2-3,3’-Co(1,2C2B9H10)2] (5). The geometries of the [8,8’-I2-3,3’-Co(1,2-C2B9H10)2]- and [9,9’,12,12’-I4-3,3’-Co(1,2-C2B9H9)2]anions are presented in Fig. 1. The dicarbollide ligands of the [8,8’-I2-3,3’-Co(1,2-C2B9H10)2]- anion have transoid conformation, whereas the cisoid conformation is formed in [9,9’,12,12’-I4-3,3’Co(1,2-C2B9H9)2]- anion.figureFig. 1. Anions [8,8’-I2-3,3’-Co(1,2-C2B9H10)2]- and [9,9’,12,12’-I4-3,3’-Co(1,2-C2B9H9)2]All the radical cation salts prepared were found to be semiconductors. The activation energy of 1-5, Ea, are ranging from 0.2 to 0.4 eV. The room temperature conductivity are 3×10-5 Ω-1cm-1, 6×10-7 Ω-1cm-1, 5×10-2 Ω-1cm-1, 0.25 Ω-1cm-1, and 6 × 10-3 Ω-1cm-1 for salts 1-5, respectively. The authors want to acknowledge Russian Foundation for Basic Research (project No 11-03-00702).