Synthesis, Crystal Structure and Characterization of [Bis { N,N′ -bis(2-aminoethyl) propane-1,3-diamine} (µ- imidazolato-N,N′)dizinc(II)] Triperchlorate

Abstract

The title compound [Zn₂(2,3,2-tet)₂(Im)] (ClO₄)₃ (C₁₇H₄₃Cl₃N₁₀O₁₂Zn₂, 2,3,2-tet = N,N′-bis(2- aminoethyl)propane-1,3-diamine, Im = imidazolate anion) consists of an imidazolate-N,N′-bridged binuclear cation and three perchlorate anions. The complex crystallizes in the monoclinic space group C 2 with a 12 . 038(8), b 12 . 245(8), c 11 . 902(3) Å, β 108 . 00(5)°, V 1668 . 6(15) ų . The coordination geometry at each zinc(II) centre is approximately square-pyramidal. The Zn . . . Zn separation is 6 . 114(9) Å. Cyclic voltammetry shows two irreversible cathodic waves at − 1 . 00 and − 1 . 08 V/s.c.e., which clearly indicates that coordination of the strong-field ligands provides significant stability to the zinc(II) centre in the title complex.