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A six-coordinated 3D metal-organic framework (MOF), namely, [Co(BPDC)(3-bpdb)(H 2 O) 2 ] n (1) (H 2 BPDC = 4,4′-biphenyldicarboxylic acid, 3-bpdb = 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene) was purposefully constructed and characterized by single-crystal XRD, IR, elemental analyses, PXRD, SEM, and TGA. Crystal structural analysis revealed that the complex consists of a cds-type three-fold interpenetrated framework.Hirshfeld surface analysis yielded details of the surface characteristics of 1. Signi cant O−H•••O hydrogen bonding interactions, which could promote the stability of the framework, were found is extremely stable in aqueous solution and can resist acids and bases over an extensive pH range of 2 -13. 1 shows brilliant uorescent emission in the solid state and in aqueous solution. Fluorescence titration, cyclic, and antiinterference experiments demonstrated that 1 is an excellent probe for Fe 3+ , CrO 4 2and Cr 2 O 7 2in water.The K sv values of 1 for Fe 3+ , CrO 4 2-, and Cr 2 O 7 2-, which were as high as 1.06 × 10 4 M −1 , 1.50 × 10 4 M −1 , and 1.16 × 10 4 M −1 , respectively, were comparable with those of other sensors. The quenching mechanism of the novel probe was subsequently explained.

We reported the covalent post-synthetic modification (PSM) of a 2D luminescent complex (HLC-NH2) to achieve aggregation-induced emission (AIE), prepared using the Schiff base reaction of TPE-CHO and HLC-NH2, denoted by...

In this study, we prepared three highly stable coordination polymers under hydrothermal conditions, {[Zn 2 (μ and {[Pb(μ 4 -DBd)]} n (3). Interestingly, the crystal-to-crystal transformation could occur between 1 and 3 via means of cation exchange. 1 and 2 were two-dimensional structures and 3 was a three-dimensional structure. The structure of 2 contains a continuous hydrogen bond network, which can form an excellent hydrophilic channel. We explored the relationship between cation exchange-induced crystal-to-crystal transformation and water adsorption capacity, and proton conductivity. 1−3 exhibited excellent stability and temperature-and humidity-dependent proton conduction properties. Among these, the water adsorption capacity of 2 was 327.39 cm 3 •g −1 , which was 8.14-fold and 39.23-fold than that of 1 and 3, respectively. The proton conductivity of 2 reached 1.67 × 10 −4 S•cm −1 at 80 °C under 98% relative humidity, which was nearly 2 orders of magnitude higher than the proton conductivity of 1 and 3. All the results indicated that the continuous hydrogen bond network inside the structure was responsible for the transfer of proton and increased the proton conductivity of coordination polymers.

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