Synthesis,Crystal Structure And Properties Of N-substituted-4-phenyl-1,2,3-triazole Acetic Acid Complexes

1,2,3-Triazole carboxylic acid derivatives are members of heterocyclic compounds containing nitrogen atoms with multiple coordination sites and the assembled complex crystals show great application prospects in terms of luminescence,catalysis,magnetic properties and adsorption.In order to study new 1,2,3-triazole transition metal complexes,thecompounds2-（4-phenyl-1,2,3-triazol-1-yl）aceticacid（HL¹）and2-（4-phenyl-1,2,3-triazol-2-yl）acetic acid（HL²）and four transition metal complexes were designed and synthesized in this thesis.The details are so follows:1.Four new N-substituted-4-phenyl-1,2,3-triazole compounds have been synthesized by the multi-step reactions using benzaldehyde as the raw material and characterized by mass spectrometry（MS）,IR spectrum,¹H NMR and X-ray single crystal diffraction.2.The complexes[Cu（L¹）₂·2H₂O]（1）,[Cu（L²）₂]_n（2）,[Co（L²）₂·2H₂O]_n（3）and[Cd（L²）₂·2H₂O]_n（4）have been measured by X-ray single crystal diffraction.The complex[Cu（L¹）₂·2H₂O]（1）is a mononuclear complex and a stable two-dimensional layered structure is formed by intermolecular hydrogen bonds.The complex[Cu（L²）₂]_n（2）is a coordination polymer.The oxygen atoms of carboxyl group on each ligand are bridged with Cu²⁺ions to form a two-dimensional（2D）network structure.Each layer of the network structure forms a stable three-dimensional（3D）supramolecular structure throughπ-πstacking.Both the complex[Co（L²）2·2H₂O]_n（3）and the compound[Cd（L²）₂·2H₂O]_n（4）are 2D coordination polymers.The oxygen atoms of carboxyl group are in the form of a cis-trans double tooth coordinated with Co²⁺or Cd²⁺ions,further form a 2D network.The 2D layer structures can be reduced to a 4⁴.6² topology with a two-node（4,4）connection.3.The infrared spectrum and thermogravimetric curves of the four complexes were measured.Thermogravimetric analysis datas show that the complexes first lose coordination water molecules when temperature increases and then the skeleton undergoes thermal decomposition at higher temperatures.Under the magnetic field of1000 Oe,the complex[Cu（L²）₂]_n（2）shows ferromagnetic coupling in the range of 2³00K and the complex[Co（L²）₂·2H₂O]_n（3）shows slow magnetic relaxation.