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Two NIR luminescent Zn(II)/Cd(II)-Yb(III) complexes were obtained by the use of a Schiff base ligand with a binaphthyl backbone. Cd(II)-Yb(III) complex 2 has a triangular structure and exhibits interesting luminescent sensing activity to antibiotics, in particular to ciprofloxacin (CPFX) and norfloxacin (NFX) due to the inner filter effect. The limits of the detection of 2 to CPFX and NFX are 0.18 and 0.36 μM, respectively, and the fluorescence sensitivity is not changed with the existence of other antibiotics tested in this study.

One 12-metal Cd(II)-Yb(III) nanoring, [Cd 8 Yb 4 L 8 (OAc) 8 ]·4OH ( 1 ), with a size of 1.2 × 2.8 × 2.8 nm was obtained from a designed flexible salen-type ligand that has eight coordination sites (O and N atoms). The near-IR emission of Yb(III) at 983 nm was detected upon the excitation of ligand-central absorption at 386 nm. This Cd(II)-Yb(III) nanoring exhibits high sensitivity to nitrofuran antibiotics (NFAs) even in the presence of other antibiotics. The quenching constants and limits of detection of NFAs are 2.5 × 10 4 -4.5 × 10 4 M -1 and 1.5-2.8 μM, respectively.

Main observation and conclusion: One near‐infrared (NIR) luminescent octanuclear Zn(II)‐Yb(III) complex [Zn6Yb2L4(OAc)2(DMF)EtOH] (1) was obtained from a new multidentate Schiff base ligand. It exhibits interesting luminescent sensing activity to antibiotics, in particular to nitrofuran antibiotics (NFAs) with high sensitivity due to the inner filter effect. The NIR luminescence quenching constants and limits of the detection of the complex towards NFAs are 2.9 × 104—5.5 × 104 L/mol and 1.27—2.38 μmol/L, respectively. Its high luminescence sensitivity to NFAs is not changed with the existence of other antibiotics. [ABSTRACT FROM AUTHOR]

A 18-metal Yb(III) nanoring was constructed by the using of a Schiff base ligand. It exhibits interesting NIR luminescent sensing behavior to antibiotics and explosives, in particular to NFAs and TNP with high sensitivity. The K SV values and LODs of this lanthanide nanoring to NFAs and TNP are 1.5 × 104–4.6 × 104 (mol/L)−1 and 1.7–5.1 μmol/L, respectively. Its high luminescence sensitivities to NFAs and TNP are not affected by the existence of other antibiotics and explosives. [Display omitted] • The complex shows a ring-like structure. • The complex displays typical NIR lanthanide luminescence. • The complex exhibits NIR luminescence response to antibiotics and explosives. [ABSTRACT FROM AUTHOR]

Two 4f and 3d-4f complexes [Yb 3 L 3 (OAc) 3 (1) and [Zn 2 NdL 2 (OAc) 3 (2) were constructed from Schiff base ligand N,N′-bis(3-methoxysalicylidene)(4-methylphenylene)-1,2-diamine (H 2 L). 1 shows a chiral "triple-decker" structure with Yb3+ ions sandwiched between the alternating layers of Schiff base ligands, while 2 exhibits a "cross" structure with the Nd3+ ion clipped by two ZnL groups. Open 3D channel structures running along the a -axis are formed in the solid state of 1 and 2. Excited by ligand-centered absorption bands, 1 and 2 show typical NIR emission of Yb3+ and Nd3+, respectively. Interestingly, 2 exhibits lanthanide luminescent response towards anions, especially to CN− and OAc− at ppm level. Image 1 • The complexes show "triple-decker" and "cross" structures. • The complexes display typical NIR lanthanide luminescence. • The Zn–Nd complex exhibits lanthanide luminescent response towards anions. [ABSTRACT FROM AUTHOR]