A copper(I) coordination polymer incorporation the corrosion inhibitor 1H-benzotriazole: poly[μ3-benzotriazolato-κ3N1:N2:N3-copper(I)]

摘要

The title complex, [Cu(C6H4N3)]n, was synthesized by the reaction of cupric nitrate, 1H-benzotriazole (BTAH) and aqueous ammonia under hydrothermal conditions. The asymmetric unit contains three crystallographically independent CuI cations and two 1H-benzotriazolate ligands. Two of the CuI cations, one with a linear two-coordinated geometry and one with a four-coordinated tetrahedral geometry, are located on sites with crystallographically imposed twofold symmetry. The third CuI cation, with a planar three-coordinated geometry, is on a general position. Two CuI cations are doubly bridged by two BTA? ligands to afford a noncentrosymmetric planar [Cu2(BTA)2] subunit, and two [Cu2(BTA)2] subunits are arranged in an antiparallel manner to form a centrosymmetric [Cu2(BTA)2]2 secondary building unit (SBU). The SBUs are connected in a crosswise manner via the sharing of four-coordinated CuI cations, Cu—N bonding and bridging by two-coordinate CuI cations, resulting in a one-dimensional chain along the c axis. These one-dimensional chains are further linked by C—H...π and weak van der Waals interactions to form a three-dimensional supramolecular architecture.