Four coordination polymers based on 4'-(4-carboxyphenyl)-2,2':6',2''-terpyridine: Syntheses, structures and properties

Two Zn(II)-based Coordination Polymers: Fe3+ Ion and Prevention Activity Detection On Postpartum Hemorrhage By Regulating Anticoagulant Factor Activity

Two new Zn(II)-based coordination polymers {[Zn₃(L₁)₆(H₂O)]∙(H₂O)₄}_n (1, HL₁ = 4-(tetrazol-5-yl)phenyl-4,2':6',4″-terpyridine) and [Zn₂Cl₂(L₂)₂H₂O]_n (2, HL₂ = 4-([2,2':6',2″'-terpyridin]-4'-yl)benzoic acid) have been successfully prepared using two similar organic ligands with distinct donor groups under similar reaction conditions. The distinct structural features and donor atoms make the two complexes show different water stability, and the complex 1 with good water stability, which can be utilized as the sensor for Fe³⁺ ion detection in water. The value of Stern-Volmer quenching constant of 1 to the Fe³⁺ is 5.77 × 10⁴ M^- 1, which lies in the top region of the reported CP-based sensors. The mechanism investigation reveals that the energy transfer of resonance from the complex 1 to the Fe³⁺ ion can account for its fluorescent quenching behavior. The treatment activity of compounds 1 and 2 on the postpartum hemorrhage (PPH) was assessed. First, the cytotoxicity of compounds 1 and 2 on human umbilical vein endothelial cells was assessed with Cell Counting Kit-8 detection kit. Then, to evaluate the prevention of compounds 1 and 2 on the PPH, we conducted the Lowry method and detected the clotting factor IX and anticoagulant factor III contents after the indicated treatment. Finally, the inflammatory response in mice was determined by ELISA method, and the IL-6 and IL-8 levels were determined.

Syntheses, structures, and magnetic properties of three supramolecular isomeric Cu(ii) square grid networks: solvents effect on the ligand linkages

Three supramolecular isomeric Cu(ii) networks with different metal fragments and ligand conformations were obtained by the adjustment of solvent molecules.

Three novel polyoxometalate-based inorganic–organic hybrid materials based on 2,6-bis(1,2,4-triazol-1-yl)pyridine

Three novel inorganic–organic hybrid materials [Co(btp)₂(W₅O₁₆)(H₂O)]_n (1), [Cd₃(btp)₆(PW₁₂O₄₀)₂(H₂O)₆·6H₂O]_n (2), and [Ag₃(btp)₂(PMo₁₂O₄₀)·1.5H₂O]_n (3) (btp = 2,6-bis(1,2,4-triazol-1-yl)pyridine) have been hydrothermally synthesized and characterized by IR spectroscopy, single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), elemental analysis and thermal gravimetric analysis (TGA). The most striking structure feature of compound 1 is a 3D polycatenation framework, interpenetrated by a 2D 4-connected sql topology layer and a 3D 6-connected rob topology framework. Compound 2 exhibits a rare meso-helices 3D network with different chiralities crossing coexistence. Compound 3 also holds a 3D framework formed by linking terminal oxygen atoms of [α-PMo₁₂O₄₀]³⁻ anions and silver ions in a 2D metal–organic layer. Compound 1 displays antiferromagnetic behavior. The luminescence, electrochemical and photocatalytic properties of compounds 1–3 have also been investigated. Compound 3 exhibits significant electrochemical activity for the reduction of H₂O₂ while compounds 1 and 2 show efficient photocatalytic activities for the degradation of Rhodamine B (RhB). Furthermore, the three compounds display luminescence behaviors in the solid state.

Three novel inorganic–organic hybrid materials based on 2,6-bis(1,2,4-triazol-1-yl)pyridine have been synthesized with different polyanions and transition metal ions.