Magnetic and conducting properties of new halide-bridged mixed-valence Cu(I)-Cu(II) 1D coordination polymers including a hexamethylene dithiocarbamate ligand

Takashi Okubo; Naoya Tanaka; Kyung Ho Kim; Hironobu Yone; Masahiko Maekawa; Takayoshi Kuroda-Sowa

doi:10.1021/ic1003098

Magnetic and conducting properties of new halide-bridged mixed-valence Cu(I)-Cu(II) 1D coordination polymers including a hexamethylene dithiocarbamate ligand

Inorg Chem. 2010 Apr 19;49(8):3700-2. doi: 10.1021/ic1003098.

Authors

Takashi Okubo¹, Naoya Tanaka, Kyung Ho Kim, Hironobu Yone, Masahiko Maekawa, Takayoshi Kuroda-Sowa

Affiliation

¹ School of Science and Engineering, Kinki University, 3-4-1 Kowakae, Higashi-Osaka-shi, Osaka 577-8502, Japan. okubo_t@chem.kindai.ac.jp

PMID: 20307080
DOI: 10.1021/ic1003098

Abstract

New mixed-valence Cu(I)-Cu(II) coordination polymers with one-dimensional, infinite-chain structures, [Cu(I)(2)Cu(II)X(2)(Hm-dtc)(2)(CH(3)CN)(2)](n) [Hm-dtc(-) = hexamethylene dithiocarbamate; X = Br(-) (1), I(-) (2)], have been prepared and structurally characterized by X-ray diffraction. These complexes consist of a mononuclear copper(II) unit Cu(II)(Hm-dtc)(2) and dinuclear copper(I) units Cu(I)(2)(CH(3)CN)(2)X(2). Magnetic studies have revealed that these complexes have a relatively strong antiferromagnetic interaction [J = -26.9 cm(-1) (1) and J = -22.2 cm(-1) (2)] between the unpaired electrons of the Cu(II) ions through the dinuclear copper(I) halide unit of Cu(I)(2)X(2) in the chain. The electrical properties of 1 and 2 are investigated using an impedance spectroscopy technique, and it is revealed that these complexes exhibit intriguing semiconducting properties with small activation energies [E(a) = 0.562 eV (1) and E(a) = 0.479 eV (2)].