| The design,synthesis and performance regulation of coordination polymers?CPs?have become one of the hot spots in coordination chemistry.In this thesis,using4-methoxyisophthalic acid and suitable nitrogenous ligands to react with metal ions by solvothermal method under different conditions,and seven new complexes have been obtained.And the relationship of their structure are discussed,as well as properties.The main work of this paper is as follows:1.Water-and temperature-induced single-crystal-to-single-crystal?SCSC?transformation and dissolution–recrystallization structural transformation?DRST?are observedamongthreenewcopper?II?coordinationpolymers,{[Cu5??3-OH?2?MIPA?4?4,4?-bpy?2]·2H2O}n?1?,{[Cu?H2O?2?MIPA??4,4?-bpy?0.5]·H2O}n?2?and{[Cu2?H2O?2?MIPA?2?4,4?-bpy???2-H2O?]·3H2O}n?3??MIPA=4-methoxyisophthalic acid,4,4?-bpy=4,4?-bipyridine?.The three-dimensional?3D?framework of 1 experienced an intensive DRST process to form the one-dimensional?1D?intermediate of 2,followed by a unique SCSC process to transform into the two-dimensional?2D?network of 3.Nevertheless,complex 3 can be obtained from complex 1 directly via another DRST.That is to say,a DRST process could be achieved by the combination of another DRST process and an SCSC process.To the best of our knowledge,this type of study is still scarce.Results have been characterized by single crystal X-ray diffraction and powder X-ray diffraction?PXRD?.Significant structural alterations were observed and these changes could be analyzed from the properties of center Cu?II?ions and the switch of chelating-bridging modes of MIPA.By consulting the literature and experiments,possible reasons and process for the structural transformation were speculated.Magnetic susceptibility measurements indicate that 1and 3 exhibit antiferromagnetic interaction between adjacent Cu?II?centers.Additionally,complexes 1–3 have been characterized by thermogravimetric analysis?TG?,infrared?IR?and PXRD studies.2.Ligand and solvent effects regulate the synthesis and properties of crystal structures.The 2D network complex 4 with the formula[Zn?MIPA?]n were solvothermally synthesized using MIPA and Zn?NO3?2·3H2O at 100°C.Adding 4,4?-bpy tothereactants,a2Ddoubleinterpenetratingnetwork{[Zn?MIPA??4,4?-bpy?0.5?H2O?]·3H2O}n?5?was synthesized.By replacing 4,4?-bpy with 1,2-bipyridylethylene?bpe?,3D triple interspersed structure complex{[Zn?MIPA??bpe?]·1.5H2O}n?6?was obtained,replacing reaction solvent,supramolecular isomers{[Zn?MIPA??bpe?]·0.5H2O}n?7?was generated,which has a self-interspersed structure.The complexes 4-7 were detected by solid-state fluorescence.Based on the strong fluorescence of complex 5,the cations and anions recognition were detected.It was found that complex 5 had better recognition ability for Al3+and S2-.In addition,four complexes were characterized by IR,PXRD and TG. |
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