Syntheses, structures and thermal properties of two new copper(II) melamine complexes

The reactions of melamine with CuCl2 · 2H2O and Cu(OAc)2 · H2O in boiling methanol afforded the complexes Cu2Cl2(μ-Cl)(μ-OCH3)(CH3OH)2(MA)2 · 2Et2O (MA = melamine), 1, and [Cu(η1-OAc)(μ-OCH3)(MA)]2 · 0.33H2O, 2, respectively, which were characterized by single crystal X-ray crystallography. The molecules of these two complexes are interlinked by the N–H⋯N self-complementary hydrogen bonds and N–H⋯X (X = Cl or O) interactions to form 2-D molecular sheets and a 3-D porous structure, respectively. Complex 2 shows both hexagonal and triangular pores constrained by the N–H⋯N self-complementary hydrogen bonds. Thermal gravimetric analyses (TGA) were carried out to investigate their thermal properties.

Graphical abstractThe reactions of melamine with CuCl2 · 2H2O and Cu(OAc)2 · H2O in boiling methanol afforded the complexes Cu2Cl2μ-Cl)(μ-OCH3)(CH3OH)2(MA)2 · 2Et2O (MA = melamine), 1, and [Cu(η1-OAc)(μ-OCH3)(MA)]2 · 0.33H2O, 2, respectively. The molecules of these two complexes are interlinked by the N–H⋯N self-complementary hydrogen bonds and N–H⋯X (X = Cl or O) interactions to form 2-D molecular sheets and a 3-D porous structure, respectively. Complex 2 shows both hexagonal and triangular pores constrained by the N–H⋯N self-complementary hydrogen bonds.Figure optionsDownload full-size imageDownload as PowerPoint slide