Fe (II)-Nd (III) hexascrew nanometer pipe polymer and preparation method

Abstract

The present invention relates to nanometer tubular hexahelix Fe(II)-Nd(III) polymer and its preparation process. The compound has the chemical expression of [Nd(PDA)3Fe1.5(H2O)3] .2.5H2O, where PDA is 2, 6-dipicolinic acid ligand. The compound is prepared through hydrothermal synthesis with 2, 6-dipicolinic acid ligand, and during the preparation, bivalent iron ion is protected in simple method to avoid being oxidized into trivalent iron ion. The present invention implants both high spinning Fe2+ ion and RE ion into nanometer tubular 3D polymer for the first time, and the obtained polymer has high heat stability, relatively high C6 symmetry and funny hexahelix structure. The polymer has wide application foreground in catalysis, adsorption, separation and other fields.

Description

technical field [0001] The invention relates to a Fe(II)-Nd(III) six-helix nanotube polymer and a preparation method. It is based on the preparation of high-spin Fe(II)-Nd(III) heterometallic six-helical nanotubular polymers. A simple and easy-to-operate method is used to protect the ferrous iron from being oxidized to ferric ions, thus achieving the first high-spin Fe 2+ Co-implanted with rare earth ions into a six-helix nanotube-shaped three-dimensional polymer, the polymer has high thermal stability and has broad application prospects in the fields of catalysis, adsorption and separation, magnetic materials, and luminescence. Background technique [0002] The 4f orbital of rare earth ions belongs to the inner orbital. Affected by the shielding effect, the change of filling electrons on the 4f orbital has little influence on the chemical properties of rare earth elements, which causes the similarity of the chemical properties of rare earth elements. But this similarity i...

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Problems solved by technology

[0004] The structure of rare earth-transition mixed metal coordination polymers is rarely reported because of the following challenges in the synthesis of such polymers: a) The high coordination number of rare earth ions and the wide range of changes make the products difficult to predict and control

In addition, even if a lattice is formed, it is easy to cause the lattice to interpenetrate with each other, so that it is difficult to observe an effective pore structure in the product; b) The competition reaction of rare earth and transition metal ions with the same ligand often leads to a single metal product instead of the desired c) It is difficult to choose a ligand with a good match in rigidity and coordination ability, because the rigidity and coordination ability of the ligand are also crucial to the topology of the polymer

[0005] For designing and synthesizing microporous Fe 2+ -Ln 3+ heterometallic coordination polymers, it is also necessary to consider how to prevent Fe 2+ is oxidized to Fe 3+ , because this reaction is easy to occur under normal conditions, the synthesis of microporous Fe 2+ -Ln 3+ Heterometallic coordination polymers represent a great challenge for synthetic chemists

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