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 image, image, image, image, image, image, image and image for unique 7686 reflections image. 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.