Syntheses, structures, fluorescence sensing properties and white-light emission of lanthanide coordination polymers assembled from imidazophenanthroline derivative and isophthalate ligands.

Nine new lanthanide coordination polymers, namely, [La 2 (MPIP) 2 (1,3-bdc) 3 ] n ‧5 n H 2 O (1) [Nd 2 (MPIP) 2 (1,3-bdc) 3 ] n ‧7 n H 2 O (2) , [Yb 2 (MPIP)(1,3-bdc) 3 ] n (3) , [Eu 2 (MPIP) 2 (1,3-bdc) 2 (CH 3 COO) 2 ] n (4) , [Ln 2 (MPIP) 2 (1,3-bdc) 2 (NO 3) 2 ] n ‧3 n H 2 O (Ln = Tb (5), Gd (6)), [Ln 2 (MPIP) 2 (1,3-bdc) 3 ] n ‧2 n H 2 O (Ln = Dy (7), Ho (8), Er (9)), MPIP = 2-(3-methylphenyl)imidazo(4,5-f)(1,10)-phenanthroline, H 2 (1,3-bdc) = benzene-1,3-dicarboxylic acid) have been synthesized under hydrothermal or solvothermal conditions and characterized by IR spectra, elemental analyses, powder X-ray diffraction and single crystal X-ray diffraction. Compounds 1 – 9 features 1D or 2D lanthanide isophthalate structures bearing large conjugated imidazophenanthroline derivative ligands. The thermal stabilities and luminescence properties of compounds 1 – 9 were investigated. Based on fluorescence sensing behavior, compounds 4 and 5 display a highly sensitive response toward Fe3+ ion through significant fluorescence quenching. Meanwhile, compound 5 can be used as an indicator to detect acidic and alkali environments. The white light emission was studied by heterogeneous physical mixing components of compounds 1 , 4 and 5. Nine new lanthanide coordination polymers based on 2-(3-methylphenyl)imidazo-(4,5-f)(1,10)-phenanthroline and benzene-1,3-dicarboxylic acid have been successfully synthesized. Compounds 1 – 9 exhibit a 1D or 2D lanthanide isophthalate structures bearing large conjugated imidazophenanthroline derivative ligands. Compounds 4 and 5 can be potential crystalline materials for detecting Fe3+ ion. Meanwhile, compound 5 can be used as an indicator to detect acid and alkali environments. In addition, white-light emission was obtained by heterogeneous physical mixing components of compounds 1 , 4 and 5. Image 1 [ABSTRACT FROM AUTHOR]