Two Coordination Modes of Bidentate Aminopyrazine Ligands in Cubane-type Cluster Complex Re₄Te₄Cl₈(C₄N₃H₄)₄ ^. 2DMF

A new cubane-type cluster complex Re₄Te₄Cl₄(C₄H₄N₃)₄ ^. 2DMF has been synthesized by reaction of Re₄Te₄Cl₈(TeCl₂)₄ with 2-aminopyrazine C₄H₅N₃ in DMF. The crystal structure of compound has been solved by X-ray single crystal diffraction method. Crystal data for Re₄Te₄Cl₄(C₄N₃H₄)₄ ^. 2DMF: a = 22.8718(16) A ° , b = 8.5936(7) A ° , c = 20.5720(17) A ° , ß° = 106.493(2), V = 3877.1(5) A ° ³, R₁ = 0.0466, Rw(F2) = 0.1191. In the complex bidentate aminopyrazine ligands are coordinated in two different types, namely, two of four aminopyrazine ligands bind to a single rhenium atom, and each of two other ligands is coordinated as bridge between two rhenium atoms.