title: Crystal structure and carrier transport properties of a new 3D mixed-valence Cu(I)-Cu(II) coordination polymer including pyrrolidine dithiocarbamate ligand.
abstract: A novel mixed-valence Cu(i)-Cu(ii) coordination polymer having an infinite three-dimensional (3D) structure, {[Cu(I)(4)Cu(II)(2)Br(4)(Pyr-dtc)(4)]·CHCl(3)}(n) (1) (Pyr-dtc(-) = pyrrolidine dithiocarbamate), has been prepared and structurally characterized via X-ray diffraction. This complex consists of 1D Cu(i)-Br chains and bridging mononuclear copper(ii) units of Cu(II)(Pyr-dtc)(2), which form an infinite 3D network. A magnetic study indicates that this complex includes copper(ii) ions exhibiting a weak antiferromagnetic interaction (θ = -0.086 K) between the unpaired electrons of the copper(ii) ions present in the diamagnetic Cu(i)-Br chains. The carrier transport properties of 1 are investigated using an impedance spectroscopy technique and flash-photolysis time-resolved microwave conductivity measurement (FP-TRMC). The impedance spectroscopy reveals that this complex exhibits intriguing semiconducting properties at a small activation energy (E(a) = 0.29 eV (bulk)). The sum of the mobilities of the negative and positive carriers estimated via FP-TRMC is Σμ∼ 0.4 cm(2) V(-1) s(-1).
authors.affiliation: Kinki University, Higashi-Osaka-shi, Osaka, Japan. okubo_t@chem.kindai.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Okubo
authors.forename: Naoya
authors.initials: N
authors.lastname: Tanaka
authors.forename: Kyung Ho
authors.initials: KH
authors.lastname: Kim
authors.forename: Haruho
authors.initials: H
authors.lastname: Anma
authors.forename: Shu
authors.initials: S
authors.lastname: Seki
authors.forename: Akinori
authors.initials: A
authors.lastname: Saeki
authors.forename: Masahiko
authors.initials: M
authors.lastname: Maekawa
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Kuroda-Sowa