Synthesis and characteristics of a novel 3-D organic amine oxalate: (enH2)1.5[Bi3(C2O4)6(CO2CONHCH2CH2NH3)]·6.5H2O

A novel 3-D compound of (enH2)1.5[Bi3(C2O4)6(CO2CONHCH2CH2NH3)]·6.5H2O has been hydrothermally synthesized and characterized by IR, ultraviolet–visible diffuse reflection integral spectrum (UV–Vis DRIS), fluorescence spectra, TGA and single crystal X-ray diffraction. It crystallizes in the monoclinic system, space group C2/c   with a=31.110(8)Å, b=11.544(3)Å, c=22.583(6)Å, β=112.419(3)°β=112.419(3)°, V=7497(3)Å3, Z=8Z=8, R1=0.0463R1=0.0463 and wR2=0.1393wR2=0.1393 for unique 7686 reflections I>2σ(I)I>2σ(I). In the title compound, the Bi atoms have eight-fold and nine-fold coordination with respect to the oxygen atoms, with the Bi atoms in distorted dodecahedron and monocapped square antiprism, respectively. The 3-D framework of the title compound contains channels and is composed of linkages between Bi atoms and oxalate units, forming honeycomb-like layers with two kinds of 6+6 membered aperture, and pillared by oxalate ligands and monamide groups. The channels have N-ethylamine oxalate monamide group −CO2CONHCH2CH2NH3+, which is formed by the in situ reaction of en and oxalate acid. At room temperature, the complex exhibits intense blue luminescence with an emission peak at 445 nm.

Graphical abstractA novel 3-D organic amine oxalate has been synthesized by hydrothermal method. In this compound, the Bi atoms and oxalate units form honeycomb-like layers with two kinds of 6+6 membered aperture. The layers are pillared by oxalate ligands and monamide groups to construct a 3-D framework. At room temperature, the complex exhibits intense blue luminescence with an emission peak at 445 nm.Figure optionsDownload full-size imageDownload as PowerPoint slide