Synthesis and Crystal Structures of Two Zinc(II) Complexes with the Schiff Bases 2-[(3-Diethylaminopropylimino)methyl]phenol and 1-[(3-Diethylaminopropylimino)methyl]naphthalen-2-ol

Abstract

Two new structurally similar mononuclear Schiff base zinc(II) complexes, [ZnBr₂L1] (1) and [ZnI₂L2] (2) (L1 = 2-[(3-diethylaminopropylimino)methyl]phenol, L2 = 1-[(3-diethylaminopropylimino)methyl]naphthalen-2-ol), have been synthesized and characterized by elemental analysis, IR, and single crystal X-ray diffraction. The Zn atom in each of the complexes is four-coordinated by one phenolate oxygen atom and one imine nitrogen atom of a Schiff base ligand and by two halide ligands, forming a tetrahedral geometry. In the crystal structures of both complexes, molecules are linked through intermolecular hydrogen bonds of types N−H · · · O, forming chains running along the b axis. The similar Schiff bases used in the preparation of the complexes with zinc(II) halides can result in the similar structures of the final products.

Keywords:

• synthesis
• crystal structure
• Schiff base
• zinc(II) complex

Notes

^a R ₁ = ∑ | |Fo| − |Fc| |/∑ |Fo|, wR ₂ = [∑ w(Fo ²− Fc ²)²/∑ w(Fo ²)²]^1/2, w ₁ = σ ²(Fo)²+ [0.0554(Fo ²+ 2Fc ²)/3]^{2 − 1}, w ₂ = {σ ²(Fo)²+ [0.0403(Fo ²+ 2Fc ²)/3]²}^{− 1}.