A mixed ligand Cd(II) complex [Cd(IsoPht)(TEA)H2O]·3H2O was synthesized for the first time by using isophthalic acid (H2IsoPht) and tetradentate triethanolamine (TEA) and characterized by X-ray single-crystal diffraction, FT-IR, and thermogravimetric analysis (TGA). This novel complex crystallizes in the triclinic system with P-1 space group and distorted monocapped trigonal prismatic geometry. The Cd(II) has seven coordinates with bidentate IsoPht, a TEA in the tetradentate mode, and an aqua ligand. The fluorescence properties of the Cd(II) complex and TEA ligand were investigated at room temperature. The present Cd(II) complex was also tested for its antimicrobial activity by in vitro agar diffusion method against some Gram-positive and Gram-negative bacteria and a fungus.

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A novel [Cd(maa)2(vim)2H2O]·H2O monomer complex was synthesized using methacrylic acid (maaH) and 1-vinylimidazole (vim) that are suitable ligands for polymerization with cadmium central atom. Cd(II)-IIP was prepared by precipitation polymerization technique using monomer complex, EGDMA, and AIBN as functional monomer, crosslinker, and initiator, respectively. The structure of the monomer complex was elucidated by single-crystal X-ray diffraction method. Infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) methods were used for characterization both of the monomer complex and Cd(II)-IIP. Scanning electron microscopy / energy-dispersive X-ray spectroscopy (SEM/EDX) methods were used for observation surface morphology and content of the polymer surfaces. The adsorption performance and selectivity properties of Cd(II)-IIP were also investigated. The maximum adsorption capacity of Cd(II)-IIP was 43.0 mg/g with 250 mg/L initial Cd(II) concentration at pH:6.0, and the selectivity was higher for Cd2+ ions than that of Pb2+, Ni2+, and Zn2+ as competitor ions. The Langmuir and Freundlich isotherm models were applied comparatively to experimental results. Cd(II) ion content of the solutions determined by inductively coupled plasma mass spectrometry (ICP-MS).

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