Synthesis, structures and properties of three lead coordination polymers based on ethylenediaminetetraacetate ligand

• Published in: Journal of solid state chemistry Vol. 278; p. 120879
• Main Authors: Liu, Dong-Sheng, Qiu, Zhi-Jun, Fu, Xiao, Liu, Yi-Zhuo, Ding, Pan, Zhu, Yun-Xia, Sui, Yan
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.10.2019
• Subjects: Fluorescence and optical absorption properties; Lead coordination polymer/ crystal structure; Fluorescence and optical absorption properties; Lead coordination polymer/ crystal structure
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2019.07.040

Three Pb(II)-edta complexes, [Pb3(edta)(H2O)Cl2]n·(H2O)3n (1), [Pb5(edta)2(H2O)2X2]n·(H2O)2n (X = Cl (2), Br (3)) (H4edta = ethylenediaminetetraacetic acid) have been synthesized by the reaction of PbX2 and H4edta under hydrothermal conditions, and were characterized by elemental analysis, thermal analysis, luminescence, powder X-ray diffraction and single-crystal X-ray diffraction. The results of X-ray crystallographic analysis reveal that these complexes are the first bilayer two-dimensional (2D) Pb-edta coordination polymers with 1D channels. The bilayers of complexes 1, 2 and 3 are linked by [Pb2Cl4], [PbCl2] and [PbBr2] clusters with carboxylate groups respectively. They are 3D supramolecular structures which are resulted from different halogenide anions. The emission spectra of 1–3 are dominated by intense and broad emission bands which are resulted from the [PbX2] clusters. Optical absorption spectra indicate that theses complexes have wide optical band-gaps and can be probably used as wide optical band-gap semiconductor materials. Three 3D supramolecular structural Pb-edta complexes have been synthesized and characterized by chemical methods. The first bilayer 2D Pb-edta compounds with 1D channel are found in these complexes. They display not only intense and broad emission bands, but also wide optical band-gaps and can be probably used as wide optical band-gap semiconductor materials. [Display omitted] •Three Pb(II)-edta complexes have been synthesized.•The first bilayer 2D Pb-edta compounds with 1D channel are found in these complexes.•They display intense and broad emission bands and wide optical band-gaps.•They can be probably used as wide optical band-gap semiconductor materials.