1-(Furan-2-ylmethyl)-1H-tetrazole and its Copper(II) Complexes

1-( Furan- 2- ylmethyl)- 1H- tetrazole ( fmt), prepared by heterocyclization of furfurylamine with triethyl orthoformate and sodium azide, was found to react with copper( II) perchlorate, nitrate, and bromide giving complexes [ Cu( fmt) 4( H2O) 2]( ClO4) 2, [ Cu( fmt) 3( NO3) 2( H2O)], and [ Cu2( fmt) 4Br4], respectively. The obtained crystalline complexes and fmt were characterized by X- ray diffraction, thermal analyses, and IR spectroscopy. In the complexes, fmt acts as a monodentate ligand coordinated via the tetrazole ring N4 atom. [ Cu( fmt) 4( H2O) 2]( ClO4) 2 comprises a mononuclear complex cation with an elongated CuN4O2 octahedron. [ Cu( fmt) 3( NO3) 2( H2O)] presents a mononuclear complex, where the copper atom is in a heptacoordinate environment forming a considerably distorted pentagonal bipyramid. [ Cu2( fmt) 4Br4] presents a centrosymmetric dinuclear bromido- bridged complex with a square pyramidal environment of copper atoms.