trans-Diaquabis{1,3-bis[5-(2-pyridyl)-2H-tetrazol-2-yl]propane}zinc(II) bis(perchlorate)

Abstract

The ZnII ion in the title compound, [Zn(C15H14N10)(H2O)2](ClO4)2, lies on a centre of symmetry. The distorted N4O2 octahedral coordination environment around the Zn atom is composed of two 1,3-bis[5-(2-pyridyl)-2H-tetrazol-2-yl]propane ligands (L1) and two water molecules, coordinated in trans positions. The ligand acts as a typical bidentate chelating ligand through one of its 2-pyridyl-2H-tetrazole units, forming a five-membered Zn—N—C—C—N metallacycle with a small N—Zn—N bite angle [77.40 (8)°]. The other 2-pyridyl-2H-tetrazole unit remains uncoordinated. The average Zn—N distance (2.156 Å) is somewhat longer than the distance between the ZnII center and the aqua ligand [2.108 (2) Å]. The coordinated pyridyl-tetrazoyl rings are quasi-coplanar, making a dihedral angle of 1.9 (2)°, while the uncoordinated rings show a larger interplanar angle of 21.3 (2)°. The flexible propane spacer displays a zigzag chain. Intermolecular O—H...N and O—H...O interactions result in two-dimensional polymeric structures parallel to (100). Two C atoms of the spacer are disordered over two positions, with site occupancy factors of ca 0.85 and 0.15.