Synthesis and Crystal Structures of Two Zinc(II) Complexes with the Tripodal Ligand Tris(2-Benzimidazolymethyl)Amine

This article reports the synthesis and crystal structures of two new mononuclear Zinc(II) complexes, [Zn₂(NTB)₂(N₃)₂](NO₃)₂·2CH₃OH (1) and [Zn₂(NTB)₂(SCN)₂](NO₃)₂·2CH₃OH·H₂O (2). Complex 1 crystallizes in the triclinic system, space group $ P \bar 1 $, a = 13.743(4), b = 14.374(4), c = 14.443(5) Å; α = 77.053(5),  = 81.824(5),  = 88.959(6)°; Z = 2; R1 = 0.0418, wR2 = 0.0889. Complex 2 also crystallizes in the triclinic system, space group $ P \bar 1 $, a = 12.203(10), b = 14.430(12), c = 18.541(15)Å; α = 72.712(15),  = 85.039(15),  = 73.610(14); Z = 2; R1 = 0.0771, wR2 = 0.1288. In both cases the central zinc(II) metal ions are coordinated to the four nitrogen atoms of NTB and a nitrogen atom of $ \rm N_3^- $(1) or SCN⁻(2) to form distorted trigonal bipyramidal coordination spheres.