Synthesis, characterizations and single crystal structure of di-nuclear azido-bridged Cd(II) coordination polymer with Schiff base precursor (H2LpentOMe): DFT, fluorescence, solvatochromism and in vitro antimicrobial assay

Synthesis, Crystal Structure, Fluorescence and Theoretical Calculations of Three Zn(II)/Cd(II) Complexes with Bis-dentate N,N-Quinoline Schiff Base

Three d10 metal complexes, ZnL(OAc)2 (1), CdL(OAc)2 (2) and [CdL2(NO3)2]·CH3CN (3) were synthesized using the ligand (E)-N-(3-methoxy-4-methylphenyl)-1-(quinolin-2-yl)methanimine (L) and characterized by FT-IR spectra, NMR spectra, and CHN elemental analysis. Single-crystal X-ray diffraction analysis revealed that complexes 1 and 2 are isostructural, with the central metal adopting a hexacoordinate octahedral geometry, while complex 3 adopts a triangular dodecahedron geometry. Thermal gravimetric analysis showed that these complexes exhibit good thermal stability. Solid-state fluorescence spectroscopy measurements demonstrated that complexes 1-3 exhibit bright yellow-green fluorescence (λem = 564 nm for 1; 524 nm for 2; 542 nm for 3), suggesting their potential as photoluminescent materials. Furthermore, DFT calculations, including frontier molecular orbitals, energy levels, and surface electrostatic potential, provided insights into the structural and electronic spectral properties of complexes 1-3.

Hydrogels Loaded with Atorvastatin-Metal Organic Framework Have a Preventive Effect on Coronary Heart Disease

In the research, a new three-dimensional coordination polymer was synthesized by solvothermal method based on the metal ligand LCu =[Cu(2,4-pydca)2 ]2- (2,4-pydca=pyridine-2,4-dicarboxylate) and alkaline-earth ion CaII with chemical composition {[Ca(H2 O)2 ][LCu ]⋅DMSO ⋅ 2H2 O}n (1) (DMSO=dimethyl sulfoxide). The complex 1 was characterized soundly by Fourier transform infrared (FT-IR) spectroscopy, elemental analysis (EA), single-crystal X-ray diffraction (SCXRD) and thermogravimetric analysis (TGA). Using atorvastatin as drug model, carboxymethyl chitosan and calcium alginate as raw materials, a new type of metal gel particles was prepared. The microstructure of the gel was observed by scanning Electron Microscope (SEM) and its modulation effect on the activity of human cardiomyocytes was evaluated. The results show that the gel particles presented a three-dimensional porous structure and were able to significantly up-regulate the cell activity of human cardiomyocytes, which is expected to develop the metal gel particles into drugs for the treatment of coronary heart disease.

Synthesis, crystal structures, and luminescent properties of Zn(ii), Cd(ii), Eu(iii) complexes and detection of Fe(iii) ions based on a diacylhydrazone Schiff base

Acylhydrazone Schiff bases are rich in N and O atoms to coordinate with metal ions to form multidentate complexes.