Synthesis,structure And Properties Of Coordination Polymers Based On Triazol Ligands

As a new kind of material,coordination polymer is characterized by novel structure and easy adjustment of pore size.It is applied in gas storage and separation,photocatalytic degradation,sewage treatment and luminescent materials.13 coordination polymers were synthesized by using 4-substituted and 1-substituted triazole ligands mtrb and mbtz and transition metal ions.We have a series of representations,and the thermal stability,catalytic activity and luminescence characteristics were studied.The preliminary results are as follows.1.Two zinc coordination polymers were synthesized by using flexible ligand mtrb and polycarboxylic acid.{[Zn₃?mtrb?₃?btc?₂]·3H₂O}_n?1?is a?3,4,4?-connected three dimensional network and{[Zn₂?mtrb?₂?btec?]·H₂O}_n?2?is a?4,4?-connected three dimensional network.The polymer 1 is a good luminescence sensor for detection of Nitro explosives,particularly for TNP,whose detection limit is as low as 0.22?M;The polymer 1 also exhibits high sensitivity and selectivity as a luminescence sensor for the detection of Fe³⁺,Cr₂O₇^2-and CrO₄^2-in aqueous solution.The detection limits for Fe³⁺,Cr₂O₇^2-and CrO₄^2-are 1.78?M,2.83?M,and 4.52?M,respectively.The possible quenching mechanisms are discussed.2.Five cobalt coordination polymers were synthesized by mbtz/mtrb and polycarboxylicacid.[Co₂?OH??mtrb??btc?]_n?3?and{[Co₃?OH?₂?mtrb?_0.5?meip?₂?H₂O?]·4H₂O}_n?4?are three dimensional network based on multicorecobaltclusters.[Co?mbtz??2,2'-bpdc?]_n?5??{Co?mbtz??4-NO₂-1,2-bdc??H₂O?₃]·2H₂O}_n?6?and{[Co?mbtz??NH₂ip?]·H₂O}_n?7?are two dimensional network.It was found that the polymers 3 and 4 could be used as photocatalysts to catalyze the degradation of Methylene Blue?MB?,Rhodamine B?RhB?and Methyl Orange?MO?and the polymer 4 degraded Methylene blue?MB?by 80.1%after 90 min.The polymers 3 and 4 could also be used as potential electrode materials with good charge and discharge cycling stability.3.Two copper coordination polymers were synthesized by mtrb/mbtz and carboxylicacidligands.{[Cu₂?mbtz?₂?1,2-bdc?₂]·3H₂O}_n?8?and{[Cu₂?OH??mtrb??sip?]·2H₂O}_n?9?are two dimensional structures.The polymers 8 and 9degrade the 3 dyes of methylene blue?MB?,rhodamine B?RhB?and methyl orange?MO?and the polymer 9 degraded methylene blue?MB?by 92.4%after 90 min,showing excellent catalytic activity.4.Four cadmium coordination polymers were synthesized by mbtz/mtrb and polycarboxylic acid.{[Cd?mbtz??1,4-bdc??H₂O?]·2H₂O}_n?10?is a 4-connected two fold3 D network;{[Cd?mbtz??ip??H₂O?]·H₂O}_n?11??{[Cd₅?OH?₂?mbtz?₂?1,2-bdc?₄]·2H₂O}_n?12?and{[Cd?mtrb??nip?]·0.5H₂O}_n?13?are two dimensional network.The fluorescence performance were also studied.