| Coordination polymers?CPs?have been extensively utilized in many fields containing catalysis,sensing,gas adsorption and separation because of remarkable structures.Luminescent coordination polymers acting as luminescence sensing materials have received tremendous attention due to their high selectivity and sensitivity features.Introducing multidentate-chelated ligands to generate luminescent coordination polymers is beneficial to constructe variable structure and promote stability,and the luminescence emission intensities and detection performances will be also enhanced.In this paper,three multidentate-chelated ligands were used to synthesize 10 new luminescent coordination polymers by solvothermal method.The crystal structures were analyzed based on single crystal X-ray diffraction,and the luminescence detection performance of the partial luminescence coordination polymers was studied.In addition,the detection application for the synthesized coordination polymer has been developed and the detection mechanism has been also perlimilarily discussed.The molecular formulas of the 11 luminescent coordination polyners are follows: ?1?{[H3O][Cd?m2-Cl??tpphz?Cl2]}n ?2?{[Cd2?m2-OAc?2?tpphz??dcb?]·tpphz·2H2O}n?3?[Cd?2-abpt??2,6-ndc?]n ?4?{[Cd?2-abpt??5-apc?]·?5-H2apc?·2H2O}n?5?[Cd?m2-Cl??2-Habpt??1,4-ndc?]n ?6?{[Cd?2-abpt??dcb?2]·0.5H2dcb}n ?7?{[Cd?pytpy??5-Hapc?]·NO3·2H2O}n?8?[Cd?pytpy??3,5-pdc?]n ?9?{[Cd?pytpy??4-pbc?]·NO3}n ?10?[Cd3?tpphz?4?obba??OAc?3?OH?]·H2O}n?11?[Cd2?2-abpt??Hbtca??H2btca?0.5?H2O?]n Thereinto,tpphz=tetrapyrido[3,2-a:2?,3?-c:3?,2?-h:2?,3?-j]phenazine;HOAc=Acetic acid;H2dcb=1,4-dicarboxybenzene;2-abpt=3,5-di?2-pyridyl?-4-amino-1,2,4-triazole;2,6-H2ndc=2,6-naphthalenedicarboxylic acid;5-H2apc=5-amino-isophthalic acid;1,4-H2ndc=1,4-naphthalenedicarboxylic acid;pytpy=4?-?4-Pyridinyl?-2,2?:6?,2”-terpyridine;3,5-H2pdc=3,5-Pyridinedicarboxylic acid;4-Hpbc=4-?4-Pyridyl?benzoic acid;H2obba=4,4'-Oxybisbenzoic acid;H4btca=1,2,4,5-Benzenetetracarboxylic acid1.Large planar double-chelated tpphz and cadmium salt are used to synthesize two luminescent coordination polymers with different structures.The double-chelated tpphz bridges[Cd2Cl4?m2-Cl?2]binuclear cluster to generate 1D trapezoidal chain in 1.2D planar layer with binuclear[Cd2?m2-OAc?2 units has a unique stacking interaction with the free tpphz in the hole to constucte a 3D supramolecular structure in 2.1-2 possess good stability and excellent luminescence.They can also detect TNP and MnO4-with high selectivity and sensitivity,and the detection effect of 2 is better.The Ksv of 2 for TNP and MnO4-is 1.35×105 M-1 and 9.53×104 M-1,respectively.Moreover,2 achieves the lowest detection dosage?0.02 mg/mL?in TNP sensors.2.Multidentate-chelated 2-abpt and different auxiliary ligands are used to construct four luminescent coordination polymers based on metal center or cluster.In 3-4,auxiliary ligands as bridging ligands are connected with the metal center,forming a 1D"V"chain and a 1D double chain,respectively.In 5,The 1D chain with[Cd2?m2-Cl?2]dinuclear clusters through interchain?-?interaction forms 2D supramolecular framework.In 6,[Cd2?m2-O?2]unit bridges dcb2-in different directions to extend a 2D 4-c sql network.5 has good stability and strong luminescence,and exhibits highly selective and sensitive detection for detecting TNP in DMF and H2O.Moreover,5 can be recycled after detecting TNP.3.A rigid tridentate pytpy and three different bifunctional auxiliary ligands are used to fine tune structure to syhtnesis three luminescent coordination polymers.7 is a 1D zigzag chain with uncoordinated basic sites.In 8,1D double chains are held together by?-?interaction to construct 2D supramolecular framework.9 is a 2D network structure.Studies indicate that 8has excellent stability and excellent luminescence,and 8 can selectively and sensitively recognize TNP and Cu2+in aqueous system with high quenching efficiency Ksv(4.91×104 M-1for TNP,3.01×105 M-1 for Cu2+). |
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