•A fluorescent sensor P-Fe based on Schiff base has been synthesized.•P-Fe can selectively recognize H2PO4− in the presence of PO43 − and HPO42 − with naked-eye fluorescence regain.•The detection limit of P-Fe to H2PO4− is 1.897 × 10− 7 M.H2PO4− plays an indispensable role in chemical, biological and environment aspects. It is essential to detect H2PO4− sensitively. In this article, we designed and synthesized a novel sensor P-Fe based on naphthalimide. Hence, P-Fe can selectively and sensitively detect H2PO4− ion by means of “turn-on” detection. After adding H2PO4−, the P-Fe solution gives a strong bright yellow fluorescence. In addition, the corresponding detection limit of P-Fe to H2PO4− is estimated to be 1.897 × 10− 7 mol/L.We designed and synthesized a novel sensor P-Fe based on Schiff base. The P-Fe solution gives a strong bright yellow fluorescence after adding H2PO4−. Hence, P-Fe can selectively and sensitively sense H2PO4− ion by means of “turn-on” detection. The detection limit of P-Fe to H2PO4− is 1.897 × 10− 7 mol/L.Download high-res image (86KB)Download full-size image

In the present work, a novel porous, and chemically stable amine-based covalent organic polymer (POP-1) was designed and synthesized under solvothermal conditions. The porosity, crystallinity, chemical stability, electrochemical properties, and diffuse reflectance of POP-1 were investigated via N2 sorption experiment, power X-ray diffraction, thermogravimetric analysis, cyclic voltammetry, and ultraviolet visible near infrared spectrometry, respectively. POP-1 exhibits good chemical stability in both acidic and alkaline aqueous solutions, as well as in organic solvents. Undoped POP-1 can be directly used as a photocatalyst for rhodamine B irradiation degradation under light-emitting diode and natural light. The Ea of POP-1 for RhB degradation is 82.37 kJ/mol. Furthermore, POP-1 can be reused as a catalyst in RhB degradation without degraded catalytic activity.Download high-res image (153KB)Download full-size image

Supramolecular hyperbranched polymers have been successfully constructed by using host-enhanced π–π interactions between CB[8] and a naphthyl-substituted tetraphenylethene derivative, which exhibit a strong fluorescence in aqueous solution due to aggregation-induced emission.

A 3D new metal–organic framework (MOF) [Cu4Cl(TIPE)3]·3Cl (1) has been synthesized and characterized. Compound 1 exhibits good chemical stability in aqueous solution with the pH ranging from 1 to 11. Interestingly, compound 1 shows high catalytic activities for the degradation of dyes (RhB, MB and MO) under LED and natural light irradiation. The Ea of 1 for RhB, MB and MO degradation is obtained to be 79.71, 66.14 and 87.26 kJ mol−1, respectively. Furthermore, compound 1 can be reused in the catalytic process without the catalytic activity obviously decreasing.

•A (4, 12)-connected interpenetrating framework is synthesized by hydrothermal method.•The results show 1 can selectively sense F− ions through fluorescence quenching.•The detection limit towards F− ions is calculated to be 2.11 × 10− 6 mol/LA new metal-organic framework, namely [Cu4I(TIPE)3].3I (1) (TIPE = tetra(3-imidazoylphenyl)ethylene), has been synthesized in the presence of sulfosalicylic acid under hydrothermal condition. Single-crystal X-ray diffraction shows that compound 1 exhibits a 2-nodal (4, 12)-connected interpenetrating network. Its luminescent property has been investigated at room temperature. Moreover, it has been used to detect halogen ions, and the experimental results show that it can selectively sense F− ions through fluorescence quenching. The detection limit towards F− ions is calculated to be 2.11 × 10− 6 mol/L.A framework [Cu4I(TIPE)3].3I based on Cu4I clusters has been synthesized by hydrothermal method. Luminescent properties of compound 1 have been investigated. It should be mentioned that this 3D cationic framework can be used as a luminescent probe to detect F− ions in the aqueous solution. The detection limit of compound 1 towards F− ions is calculated to be 2.11 × 10− 6 mol/L.

An efficient turn-on fluorescent sensor for PO43− has been developed by rationally designing an in situ-generated iron(III) complex with a 1,8-naphthalene-based Schiff base unit. The sensor exhibits high sensitivity and selectivity in both solution and solid-state film, even in the presence of other phosphate anions such as HPO42− and H2PO4−.

A luminescent coordination polymer with tubular channels was synthesized and characterized. The polymer was able to sense small solvent molecules and metal ions via fluorescence quenching. In particular, the polymer was able to rapidly and selectively sense Cu2+ ions in a suspension of mixed metal ions without any interference effects.

By means of ab initio HF methods, the ground state structures of 8-hydroxyquinoline (8-HQ) monomers and dimers were optimized using the 6-311+g* and 6-31G basis sets, respectively. The lowest singlet excited states of 8-HQ monomers and dimers have been studied by the single-excitation configuration interaction (CIS) approach at the same level. In the studies of the potential energy surface, it was found that all the stable configurations corresponded to enol form. The UV-vis and fluorescence spectra of 8-HQ monomers and dimers under a solvent effect condition were also calculated using the TD-B3LYP/6-31+G* method based on the HF- and CIS-optimized geometries. The computed absorption and fluorescence spectral characteristics for monomers and dimers were in good agreement with previously reported experimental values. The results also show that 8-HQ has very poor fluorescence in solvents.

An efficient turn-on fluorescent sensor for PO43− has been developed by rationally designing an in situ-generated iron(III) complex with a 1,8-naphthalene-based Schiff base unit. The sensor exhibits high sensitivity and selectivity in both solution and solid-state film, even in the presence of other phosphate anions such as HPO42− and H2PO4−.

A 3D new metal–organic framework (MOF) [Cu4Cl(TIPE)3]·3Cl (1) has been synthesized and characterized. Compound 1 exhibits good chemical stability in aqueous solution with the pH ranging from 1 to 11. Interestingly, compound 1 shows high catalytic activities for the degradation of dyes (RhB, MB and MO) under LED and natural light irradiation. The Ea of 1 for RhB, MB and MO degradation is obtained to be 79.71, 66.14 and 87.26 kJ mol−1, respectively. Furthermore, compound 1 can be reused in the catalytic process without the catalytic activity obviously decreasing.