Synthesis, Structures And Fluorescence Of Rare Earth Metal Complexes Based On 5,5`-bis(1H-tetrazolyl)amine

Metal-Organic Framework(MOF), also called Metal-Organic Complexes(MOC),which is a kind of novel material self-assembled by metal-centered ions and organic ligands, and it possesses periodicity and supermolecular network. Distinguished with normal organic or inorganic materials, MOFs combine both characteristics of organic polymers and metal ions. Consequently, functional MOFs can be fabricated by controlling the conditions of the reaction, such as reagents’ species, concentrations and time, p H.Rare-earth metals are characterized by f orbital, of which properties are different from transition metals and main group metals, and mainly exist as trivalent cations.Furthermore, rare-earth metallic cations are beneficial to coordination with substrates and activation for their larger molecular radius and higher coordination number. As a consequence of that, rare-earth metals are usually utilized to construct novel networks with varieties of organic ligands as inorganic metal-centered.In this article, we fabricated 12 completely fresh rare-earth metal based MOFs,using 5,5’-bis(1 H-tetrazolyl)amine as the organic ligands via hydrothermal and solvothermal reactions: [Pr2(bta)(NO3)2(OH)2]n(1), [Ln2(bta)(NO3)2(OH)2]n(Ln=La(2),Pr(3)), [Pr Na(bta)2(H2O)7]n(4), [Ln2(bta)3(H2O)14](Ln=Y(5), Dy(6)),[La(bta)(Hbta)(H2O)5]·3H2O(7), [Ln(bta)(Hbta)(H2O)4]·H2O(Ln=Pr(8), La(9), Dy(10),Y(11)), [Pr(bta)(NO3)(DMF)3(H2O)2](12). We not only characterized their crystal structure with single crystal X-ray diffraction, but also characterized their solid-state fluorescent, Fourier Transform infrared spectroscopy and X-ray diffraction, moreover,we analysed some compounds thermostability with thermogravimetric analysis. Thus,we found compound 1 possessing 2-dimensional serrated layered structure, forming by NO3-with 1-dimensional serrated chain-like structure, while compound 2, 3 possessing2-dimensional waved layered structure, forming by NO3- with 1-dimensional waved chain-like structure, compound 4 possessing 1-dimensional wire-like structure, and others possessing 0-dimensional structure. The result of their fluorescent suggests that compounds 1, 2, 4, 5, 6, 8, 9, 10, 11, 12 possess emission peaks at 527, 484, 377, 483,482, 508, 490, 484, 488, 405 nm under their exciting light, respectively. And the compounds 4 and 12 generate blue-shift compared to the ligand, while others generate red-shift.