Synthesis and characterization of lanthanide-based coordination polymers for highly selective and sensitive luminescent sensor for Pb2+ over mixed metal ions.

Three novel coordination polymers, namely, {[Pr(TTTPC)·(H 2 O) 2 ]·2Cl·NO 3 ·4H 2 O} n ( I ), {[Gd(TTTPC)·(H 2 O) 2 ]·2Cl·NO 3 ·4H 2 O} n ( II ) and {[Yb(TTTPC)·(H 2 O) 2 ]·3Cl·NO 3 ·0.5DMA·6H 2 O} n ( III ) were synthesized in conventional aqueous solutions with H 3 TTTPC ligands (H 3 TTTPC = 1,1′,1″-(2,4,6-trimethylbenzene-1,3,5-triyl(methylene))-tris(pyridine-4-carboxylic acid), DMA = N,N -dimethylacetamide) and characterized by infrared spectrometry and single crystal X-ray diffraction. Experimental results show that these MOFs are isomorphous and isostructural, containing the unit of cavate 14-membered cages (Pr 2 (OCO) 4 ), based on which to generate a one-dimensional (1D) infinite linear metallic chain through the linkage of two COO − groups that are further interlinked reciprocally to polymerize into three-dimensional (3D) porous frameworks. Coordination polymer III shows remarkable selectivity toward Pb 2+ and it can be considered as potential selective luminescent probes for Pb 2+ ion. Additionally, magnetic analysis indicates coordination polymer I presents antiferromagnetism. Besides, lanthanide contraction effect exists in as-synthesized coordination polymers. [ABSTRACT FROM AUTHOR]