Different effects in the selective detection of aniline and Fe 3+ by lanthanide-based coordination polymers containing multiple reactive sites

• Published in: CrystEngComm 2020-04, Vol.22 (16), p.2837-2844
• Main Authors: Liu, Xinfang, Du, Liyong, Li, Rongfang, Ma, Ningning, You, Mengdi, Feng, Xun
• Format: Article
• Language: English
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/D0CE00238K

In this paper, three isostructural 1D lanthanide complexes, [Ln(dppc)(H 2 O) 4 ] n ·2 n H 2 O (Ln = Eu, Tb and Eu 0.501 Tb 0.499 , named 1 -Eu , 2 -Tb and Eu 0.501 Tb 0.499 ), based on 3-(2,4-dicarboxylate phenyl)-2-pyridinecarboxylic acid (H 3 dppc) have been synthesized and characterized by elemental analysis, IR, PXRD, TG and X-ray crystallography. The complexes exhibit a 1D chain structure, which is further linked into a 3D supramolecular framework by hydrogen bonds. Tuneable emission colour of Eu 0.501 Tb 0.499 is realized by adjusting the excitation wavelength. The sensing properties of 1 -Eu and 2 -Tb towards Fe 3+ and aniline indicate that the two complexes have almost the same superior sensitivity and low detection limit for Fe 3+ in aqueous solution, while they have different detection abilities for aniline in DMF solvent. The different detection abilities were discussed by means of PXRD, UV-vis, luminescence lifetimes and molecular surface calculations (Hirshfeld surface analysis and 2D fingerprint plots).