Temperature-induced 1D lanthanide polymeric frameworks based on Lnn (n = 2, 2, 4, 6) cores: synthesis, crystal structures and luminescence properties. Issue 7 (11th January 2016)

• Record Type: Journal Article
• Authors: Li, Jia-Jia; Fan, Ting-Ting; Qu, Xiang-Long; Han, Hong-Liang; Li, Xia
• Is Part Of: Dalton transactions. Volume 45:Issue 7(2016)
• Page Start: 2924
• Page End: 2935
• Publication Date: 2016-01-11
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c5dt04262c
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : 1D lanthanide polymeric frameworks were synthesized. White-light emission by two-/three-component complexes was realized. A Eu(iii )-complex could detect nitrobenzene and Ni 2+ ion via a fluorescence quenching mechanism. Abstract : The hydrothermal reaction of the same reactive system containing Ln(NO3 )3 ·6H2 O, tetrafluorophthalic acid (H2 TFPht), and 1, 10-phenanthroline (phen) at different temperatures yielded coordination polymers, [Ln2 (TFPht)3 (phen)2 (H2 O)2 ]·H2 O (Ln = Sm1, Eu2, Gd3, Tb4, Dy5 ; at 120 °C), La(TFPht)(TFBA)(phen)(H2 O) (6 ; at 160 °C), Ln3 (TFPht)4 (TFBA)(phen)3 (H2 O)3 (Ln = Dy7, Tb8, Yb9 ; at 160 °C), and Ln2 (TFBA)6 (phen)2 (Ln = Eu10, Tb11 ; at 180 °C). 2, 3, 4, 5-Tetrafluorobenzoic acid (TFBA) was produced from the decarboxylation of TFPht. X-ray structural analysis reveals that these compounds contain different structural motifs. Complexes1–5 exhibit zigzag chain structures based on the center-related tetranuclear [Ln4 ] as SBUs (Secondary Building Units) with two crystallographically independent Ln 3+ ions. Complex6 contains a double chain structure with center-related binuclear [La2 ] as SBUs. Complexes7–9 show single chain structures involving center-related hexanuclear [Ln6 ] as SBUs with three crystallographically independent Ln 3+ ions. Complexes10 and11 have ribbon chain structures involving binuclear [Ln2 ] as SBUs with two crystallographically independent Ln 3+ ions. The photoluminescence properties of complexes1–5 were studied. The Eu 3+ and Tb 3+ complexes exhibit bright red and green emissions with quantum yields of 15.87% for2 and 23.82% for4 . The two-component Dy:Eu- and three-component Gd:Dy, Eu-doped complexes provided white light emission. Moreover, 2 could be a potential luminescent probe for detecting nitrobenzene and Ni 2+ ion through significant fluorescence decrease of Eu 3+ .