Molecular conductors based on peri-ditellurium-bridged donors, 2,3-DMTTeA and TMTTeN

Emiko Fujiwara, Hideki Fujiwara, Bakhyt Zh Narymbetov, Hayao Kobayashi, Masahiro Nakata, Hajime Torii, Akiko Kobayashi, Kazuo Takimiya, Tetsuo Otsubo, Fumio Ogura

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Molecular conductors based on peri-ditellurium-bridged polyacene donor molecules 3,4-dimethylanthra[1,9-cd:4,10-c′d′]bis[1,2]ditellurole (2,3-DMTTeA) and 2,3,6,7-tetramethylnaphtho[1,8-cd:4,5-c′d′]bis[1,2] ditellurole (TMTTeN) were prepared. The crystal structure analyses of neutral 2,3-DMTTeA molecule and its cation radical salts revealed that these crystals involve an orientational disorder of the asymmetrical molecule, 2,3-DMTTeA, and that the intermolecular network through tellurium atoms is very strong and dominant in terms of the construction of the crystal frameworks. In the crystal of (TMTTeN)2M(CN)2 (M = Ag and Au), the crystal structure analyses and the extended Hückel tight-binding band calculations indicated that these salts are quasi three-dimensional conductors. These salts are highly conductive (720-760 S cm-1) and maintain metallic states down to about 50 K. Furthermore, the Ag(CN)2- salt exhibited a Pauli paramagnetic behavior down to 2 K [χ(para) ≈ 2.0-2.5 × 10-4 emu mol-1]. In the crystal of (TMTTeN)(SCN) 0.88, the donor molecules are stacked to form one-dimensional columns and construct a three-dimensional network between the columns through the intermolecular Te⋯Te contacts. The SCN- salt is also highly conductive (590 S cm-1) and maintains a metallic behavior down to 4.2 K. Almost temperature-independent paramagnetic susceptibility of (TMTTeN)(SCN)0.88 indicates Pauli paramagnetism of this salt [χ(para) ≈ 1.6-1.9 × 10-4 emu mol-1]. A tight-binding band structure calculation indicates that the Fermi surface of the SCN- salt is open along the b* and c* directions, but the intermolecular interactions between the donor columns are not so weak because of the three-dimensional network mediated by the protruded tellurium atoms.

Original languageEnglish
Pages (from-to)3435-3449
Number of pages15
JournalEuropean Journal of Inorganic Chemistry
Issue number17
DOIs
Publication statusPublished - 2005 Sep 5
Externally publishedYes

Keywords

  • Band structure
  • Conducting materials
  • Magnetic properties
  • Tellurium

ASJC Scopus subject areas

  • Inorganic Chemistry

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