Synthesis And Properties Of Bis-Schiff Base And Bis-8- Hydroxyquinoline Coordination Polymers

In this paper,bis-Schiffbase?1e⁶e?and bis-8-hydroxyquinoline?8CHQ-1,8CHQ-2?ligands were synthesized by p-nitrobenzoic acid and 3,5-two nitroobenzoic acid as raw materials.The bis-Schiff base ligands coordinated with Zn²⁺to get P1^P6,P2 was small cyclic coordination complex,P1 and P3^P6 were coordination polymers.The bis-8-hydroxyquinoline ligands coordinated with Zn²⁺and Al³⁺to get P7^P10.The structure and properties of ligands and coordination polymers were confirmed by IR,UV-vis,¹H NMR,GPC,TG and fluorescence.The Mw of P1 and P3^P6 were 7856 g/mol,6548⁷856 g/mol,PDI was 1.54¹.83.The coordination polymers?P1,P3^P6?and coordination complex P2 can be dissolved in DMF,DMSO,DMAc and NMP,The 8-hydroxyquinoline coordination polymers?P7^P10?can be partly dissolved in DMF,DMSO,DMAc and NMP.P1^P10 showed good solubility.5%weight loss temperature of the zinc Schiff base coordination polymers?P1,P3^P6?were from 281 to 309?.5%weight loss temperature for coordination complex P2was 279?,5%weight loss temperature of the 8-hydroxyquinoline coordination polymers?P7^P10?were from 223 to 309?.P1^P10 showed good thermal stability.The fluorescent maximum emission peaks of coordination complexes P1^P6 were about 510 nm,they emited green in DMF solution,the fluorescence efficiency of P1^P6 were from 30 to 46%,the fluorescent peaks of P1^P6 in the solid state were about 550nm.The fluorescent maximum emission peaks of coordination polymers?P7,P9?in DMF solution and in the solid state were 550 and 560nm,they emited yellow.The fluorescent maximum emission peaks of coordination polymers?P8,P10?were about 520nm,they emited green in DMF solution,the fluorescent peaks of them in the solid state were about 540nm,they emited yellow-green.The 9 kinds of coordination polymers showed good solubility,thermal stability and fluorescence property,they can be used in the field of optical functional polymer material.