Effect of pH on the construction of CdII coordination polymers involving the 1,1'-[1,4-phenylenebis(methylene)]bis(3,5-dicarboxylatopyridinium) ligand

Synthesis and Structure Elucidation of Two Essential Metal Complexes: In-Vitro Studies of Their BSA/HSA-Binding Properties, Docking Simulations, and Anticancer Activities

Imidazole and tetrazole derivatives are widely used as clinical drugs since they possess a variety of pharmaceutical function. Zinc and iron are essential trace elements of the human body, with less toxicity and good biocompatibility. In this paper, two new essential metal mononuclear complexes [M(H₂tmidc)₂(H₂O)₂]·2H₂O (M = Zn (1), Fe (2)) were synthesized through the reaction of 2-((1H-tetrazol-1-yl)methylene)-1H-imidazole-4,5-dicarboxylic acid (H₃tmidc) and ZnSO₄·7H₂O or FeSO₄·7H₂O. The crystal structures were determined by means of the X-ray single crystal diffraction technique. Results from fluorescence investigations show that both complexes could interact with BSA as well as HSA through the static quenching mechanism. van der Waals forces and hydrogen bonds play important roles in the interaction of complexes and BSA/HSA since both ΔH and ΔS values are negative. The results of molecular docking are consistent with those in experimental studies. Furthermore, the anticancer activity of H₃tmidc and both complexes against Eca-109 were preliminarily evaluated and the results show that both complexes have better anticancer activity than the corresponding ligand H₃tmidc.

Crystal structure of [diaqua[2,2′-(1,2-phenylene)bis(1H-imidazole-4-carboxylato-5-carboxy)-κ4 N,N′,O,O′]nickel(II)] tetrahydrate, C16H12N4NiO10·4H2O

C16H20N4NiO14, orthorhombic, Pnma (No. 62), a = 7.1945(2) Å, b = 16.1805(4) Å, c = 17.7912(5) Å, V = 2071.08(10) Å3, Z = 4, Rgt (F) = 0.0353, wRref (F 2) = 0.0997, T = 293(2) K.

Two new CdII MOFs of 1,4-bis(1H-benzimidazol-1-yl)butane and flexible dicarboxylate ligands: luminescence sensing towards Fe3

Two new Cd^II MOFs, namely, two-dimensional (2D) poly[[[μ₂-1,4-bis(1H-benzimidazol-1-yl)butane](μ₂-heptanedioato)cadmium(II)] tetrahydrate], {[Cd(C₇H₁₀O₄)(C₁₈H₁₈N₄)]·4H₂O}_n or {[Cd(Pim)(bbimb)]·4H₂O}_n (1), and 2D poly[diaqua[μ₂-1,4-bis(1H-benzimidazol-1-yl)butane](μ₄-decanedioato)(μ₂-decanedioato)dicadmium(II)], [Cd₂(C₁₀H₁₆O₄)₂(C₁₈H₁₈N₄)(H₂O)₂]_n or [Cd(Seb)(bbimb)_0.5(H₂O)]_n (2), have been synthesized hydrothermally based on the 1,4-bis(1H-benzimidazol-1-yl)butane (bbimb) and pimelate (Pim^2-, heptanedioate) or sebacate (Seb^2-, decanedioate) ligands. Both MOFs were structurally characterized by single-crystal X-ray diffraction. In 1, the Cd^II centres are connected by bbimb and Pim^2- ligands to generate a 2D sql layer structure with an octameric (H₂O)₈ water cluster. The 2D layers are further connected by O-H...O hydrogen bonds, resulting in a three-dimensional (3D) supramolecular structure. In 2, the Cd^II centres are coordinated by Seb^2- ligands to form binuclear Cd₂ units which are linked by bbimb and Seb^2- ligands into a 2D hxl layer. The 2D layers are further connected by O-H...O hydrogen bonds, leading to an 8-connected 3D hex supramolecular network. IR and UV-Vis spectroscopy, thermogravimetric analysis and solid-state photoluminescence analysis were carried out on both MOFs. Luminescence sensing experiments reveal that both MOFs have good selective sensing towards Fe³⁺ in aqueous solution.

Crystal structure of catena-poly[diaqua(μ2-2-(hydroxymethyl)-1H-imidazole-4,5-dicarboxylato)cadmium(II)], C6H8CdN2O7

C6H8CdN2O7, monoclinic, P21/c (no. 14), a = 7.3428(15) Å, b = 11.272(2) Å, c = 12.764(4) Å, β = 118.73(2)°, V = 926.4(4) Å3, Z = 4, R gt(F) = 0.0261, wR ref(F 2) = 0.0609, T = 293(2) K.