Chiral Coordination Polymers from a New 2-Deoxy-d-ribose Derivative Linker: Syntheses, Structures, and Fe³⁺ Fluorescent Probe Functions

Abstract

Research on coordination polymers (CPs) using 2-deoxy-d-ribose derivatives as ligands has not been documented to the best of our knowledge. Herein, the new ligand L (1,3,4-trikisisoniacyl-2-deoxy-β-d-ribopyranose) was designed and synthesized from 2-deoxy-d-ribose, and four CPs {[MnL 2Cl2]·4CH3OH}∞ (1), {[CoL 2Cl2]·4CH3OH}∞ (2), {[NiL 2Cl2]·4CH3OH}∞ (3) and {[CoL 2Br2]·4CH3OH}∞ (4) were prepared using L as the bridging ligand. Single-crystal X-ray analyses showed that the above four CPs crystallize in the trigonal space group P3121 and have the same 2D grid structures with the same 1D meso-helices and the same 3D supramolecular architectures, and each metal center bonds with four pyridyl rings to form a Δ-propeller configuration in 1–4. The same space groups, structures, and chiral types of the propellers of 1–4 suggest that L is a powerful ligand in controlling the structures and chiralities of its metal complexes. Interestingly, 3 gave weaker emission in the solid state but much stronger emission in suspension, and 2–4 showed the ability to sense Fe3+ with LODs of 2.75, 0.12, and 0.87 μM and quenching constants of 1.07 × 104, 1.67 × 104, and 3.33 × 104 M–1, respectively, and high interference resistance, indicating their potential to be used as sensitive fluorescence sensors for detecting Fe3+. The different metal centers of 1–4 should be the main factors that make them distinct in fluorescent properties and probe functions due to the similarities in compositions and structures of the four CPs.

Trefoil-Shaped Metal–Organic Cages as Fluorescent Chemosensors for Multiple Detection of Fe3+, Cr2O72–, and Antibiotics

“…The absorption of Fe 3+ ions in the extended visible region (<500 nm, Figure S23) clearly overlapped with the excitation spectrum of cage 1 . This results illustrated that the quenching process may be caused by the resonance energy-transfer mechanism. , …”

“…This results illustrated that the quenching process may be caused by the resonance energy-transfer mechanism. 25,47 Sensing of Anions. In order to further investigate the sensing performance of cage 1, similar sensing experiments were carried out for anions using an experimental method similar to that for cations.…”