A series of homonuclear lanthanide coordination polymers based on a fluorescent conjugated ligand: syntheses, luminescence and sensor for pollutant chromate anion

A family of six new homo-lanthanide coordination polymers incorporating a conjugated ligand of 2,5-di(2',4'-dicarboxylpheny)pyridine, namely, {[Ce( mu sub(3-)ddpp)].4H sub(2)O}n (1), {[Nd( mu sub(3-)ddpp)].2H sub(2)O}n (2), {[Sm( mu sub(6-)ddpp)].H sub(2)O}.H sub(2)O}n (3), {[Eu( mu sub(6-...

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Bibliographic Details
Published in:CrystEngComm 2015-01, Vol.17 (41), p.7878-7887
Main Authors: Feng, Xun, Li, Rongfang, Wang, Liya, Ng, Seik Weng, Qin, Guozhan, Ma, Lufang
Format: Article
Language:English
Subjects:
Anions
Chains (polymeric)
Coordination polymers
Fluorescence
Lanthanides
Ligands
Luminescence
Polymers
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Summary:A family of six new homo-lanthanide coordination polymers incorporating a conjugated ligand of 2,5-di(2',4'-dicarboxylpheny)pyridine, namely, {[Ce( mu sub(3-)ddpp)].4H sub(2)O}n (1), {[Nd( mu sub(3-)ddpp)].2H sub(2)O}n (2), {[Sm( mu sub(6-)ddpp)].H sub(2)O}.H sub(2)O}n (3), {[Eu( mu sub(6-)ddpp)].H sub(2)O}n (4), {[Tb( mu sub(6-)ddpp)].H sub(2)O}n (5), and {[Er( mu sub(6-)ddpp)].H sub(2)O}n (6) (H sub(3)ddpp = 2,5-di(2',4'-dicarboxylpheny)pyridine acid), has been prepared successfully through solvothermal reactions. Polymers 1-6 exhibit various coordination environments and different multi-dimensions, but they are all assembled in a one dimensional (1-D) Ln-carboxylate chain. Polymer 1 only shows a 1-D ribbon chain, while polymer 2 exhibits a binodal (3, 8)-connected topology net. Heavy lanthanide polymers 4-6 possess 3D frameworks based on a rare (4, 8)-connected msw framework. Thermogravimetric and different thermal analysis measurements indicate that they all display high thermal stability. The luminescence emission spectra display characteristic f-f transition emissions of Ln(iii) polymers in visible or near infrared (NIR) regions. The fluorescent ligand H sub(2)ddpp provides efficient energy transfer for the sensitization of Eu(iii) and Tb(iii) ions in the visible region, among which a Tb(iii) polymer may be employed as a fluorescence ratiometric probe for the pollutant CrO sub(4) super(2-) anion.
ISSN:1466-8033
1466-8033
DOI:10.1039/c5ce01454a