Development of two Cu(II) and Cd(II) coordination complexes based on mixed-ligand approach and application of their nanostructures as potential anti-breast cancer agents

Supramolecular Mn(III) Coordination Polymer with Treatment Activity on Diabetic Retinopathy

A new Mn(III) coordination polymer formulated as [Mn2(L)2Cl2(DMF)2]n (1, H2L is 2,2′-bipyridyl-6,6′-dicarboxylic acid; DMF is N,N′-dimethylformamide) was solvothermally prepared using Mn(ClO4)2 · 6H2O, H2L, and (CH3)4NCl as raw materials. The assay of SCXRD for 1 suggests that it features a 0D isolated dinuclear [Mn2(L)2Cl2(DMF)2] structure that exists in P-1 with triclinic system, and the cell parameters are a = 8.4593(2), b = 9.4675(5), c = 11.0147(6) Å, α = 86.023(3), β = 74.892(6), γ = 78.055(4)°, V = 833.11(7) Å3, and Z = 1. These isolated 0D dinuclear [Mn2(L)2Cl2(DMF)2] motifs were extended into a 1D supramolecular chain via the connection of intermolecular C–H…Cl together with the C–H…O H bond. Furthermore, the novel CP’s treatment activity against the diabetic retinopathy was investigated, and the associated mechanism of the new compound was discussed.

Capped Nanojars: Synthesis, Solution and Solid-State Characterization, and Atmospheric CO2 Sequestration by Selective Binding of Carbonate

Nanojars are a class of supramolecular anion-incarcerating coordination complexes that self-assemble from Cu²⁺ ions, pyrazole, and a strong base in the presence of highly hydrophilic anions. In this work, we show that if the strong base (e.g., NaOH or Bu₄NOH) is replaced by a weak base such as a trialkylamine, capped nanojars of the formula [{Cu₃(μ₃-OH)(μ-pz)₃L₃}CO₃⊂{Cu(μ-OH)(μ-pz)}_n] (pz = pyrazolate anion; L = neutral donor molecule; n = 27-31) are obtained instead of the conventional nanojars. Yet, to obtain capped nanojars, the conjugate acid side product originating from the weak base must be separated by transferring it to water either by precipitation of the water-insoluble capped nanojars or by liquid-liquid extraction. Full characterization using electrospray ionization mass spectrometry, UV-vis and variable-temperature ¹H NMR spectroscopy in solution, and single-crystal X-ray diffraction, elemental analysis, and solubility studies in the solid state reveals similarities as well as drastic differences between capped nanojars and nanojars lacking the [Cu₃(μ₃-OH)(μ-pz)₃L₃]²⁺ cap. Acid-base reactivity studies demonstrate that capped nanojars are intermediates in the pH-controlled assembly-disassembly of nanojars. During the self-assembly of capped nanojars, CO₂ is selectively sequestered from air in the presence of other atmospheric gases and converted to carbonate, the binding of which is selective in the presence of NO₃^-, ClO₄^-, BF₄^-, Cl^-, and Br^- ions.