Abstract
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.
Highlights
IntroductionTriethanolamine (TEA) is a potential ligand that can interact with metal ions to form supramolecular complexes with different structures, and many coordination compounds containing TEA ligands have been reported for the last two decades.[1,2,3,4,5,6] TEA is used as a pH regulator in cosmetology, as a corrosion inhibitor in metal-cutting fluids, as a curing agent for epoxy and rubber polymers, in adhesives, antistatic agents, or as a pharmaceutical intermediate.[7,8,9] TEA generally acts as the tri- or tetradentate ligand, but some metal complexes with mono- or bidentate TEA coordination modes are known.[10,11] Metal complexes containing TEA ligand can be (neutral or cationic) mono-, bi- and polynuclear structures.[12,13] Some mononuclear mixed ligand complexes were reported for Ni(II) with TEA and orotic acid,[14] Cu(II) with TEA and malonic acid,[15] Zn(II) and Cd(II) with TEA and p-nitrobenzoic acid,[16] Zn(II) with TEA and aqua ligand,[17] Cu(II) with TEA, aqua and 1H-imidazole ligands,[18] aqua ligand.[19]
H2IsoPht acts as a bidentate ligand by losing hydrogen atoms while the TEA ligand acts as a tetradentate ligand using all its donor atoms
The Cd1 atom is coordinated by six oxygen atoms and one nitrogen atom, two of which are from IsoPht ligand (O1 and O2), three oxygen atoms, and one nitrogen atom from a TEA ligand (O5, O6, O7, and N1), together with one oxygen atom of aqua ligand, O8W
Summary
Triethanolamine (TEA) is a potential ligand that can interact with metal ions to form supramolecular complexes with different structures, and many coordination compounds containing TEA ligands have been reported for the last two decades.[1,2,3,4,5,6] TEA is used as a pH regulator in cosmetology, as a corrosion inhibitor in metal-cutting fluids, as a curing agent for epoxy and rubber polymers, in adhesives, antistatic agents, or as a pharmaceutical intermediate.[7,8,9] TEA generally acts as the tri- or tetradentate ligand, but some metal complexes with mono- or bidentate TEA coordination modes are known.[10,11] Metal complexes containing TEA ligand can be (neutral or cationic) mono-, bi- and polynuclear structures.[12,13] Some mononuclear mixed ligand complexes were reported for Ni(II) with TEA and orotic acid,[14] Cu(II) with TEA and malonic acid,[15] Zn(II) and Cd(II) with TEA and p-nitrobenzoic acid,[16] Zn(II) with TEA and aqua ligand,[17] Cu(II) with TEA, aqua and 1H-imidazole ligands,[18] aqua ligand.[19]. Isophthalic acid has two carboxyl groups that can lose one or two protons to form various coordination modes, act as a hydrogen bond acceptor and donor. It is a versatile and variable ligand that can bind metal ions in different directions.[31,32,33,34,35,36,37,38] The synthesis of coordination compounds containing O and/or N-donor ligands are very significant. The fluorescence and antimicrobial properties of the complex were investigated, too
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