Synthesis and Spectroscopic Determination of the Coordination Differences of Cadmium and Zinc Complexes of Dehydroacetic Acid with Pyridine and g-Picoline
Journal: Academic Journal of Chemistry (Vol.4, No. 9)Publication Date: 2019-09-15
Authors : Erika Martins de Carvalho; Roselene Ribeiro Riente; José Daniel Figueroa Villar;
Page : 81-89
Keywords : Zinc-Cadmium exchange; Coordination geometry difference; Dehydroacetic acid; Bipyramidal geometry; NULL; Molecular modeling.;
Abstract
Various complexes of DHA with transition-metal cations are known for their antifungal properties. Here, four novel Zn and Cd complexes were prepared via the substitution of water by pyridine andg-picoline using Zn(DHA)2(H2O)2 (2) and Cd(DHA)2(H2O)2 (3) as starting materials. The products were characterized by IR, UV, elemental analysis, TGA and NMR techniques, including correlation times and intermolecular distance measurements using the NULL pulse sequence. The experimental data were compared to the molecular modeling results using DFT and the semiempirical method PM3, confirming that the pentacoordinated Zn complexes have bipyramidal geometry while the Cd complexes have the expected octahedral geometry. These results show that substitution of Zn by Cd leads to an important modification of the coordination structure, especially when strong ligands are involved.
Other Latest Articles
- Chemical Characterization and Leaching Kinetics of Metals From Iron Ores
- Nutrients Recovery From Aquaculture Wastewater Using Thermally Treated Gastropod Shells
- Ultra Sensitive UPLC Method Development and Validation for the Simultaneous Estimation of Tamsulosin Hydrochloride and Tolterodine Tartrate in Bulk and Pharmaceutical Dosage Form
- Non Destructive Methods (XRF and XRD) For Estimation of Impure Carbon and Heavy Metals in Printer Toner Ink Powder
- Chemical Modification of Expandable Graphite by Boric Acid and Its Flame Retarded Application in Polyethylene
Last modified: 2020-08-13 15:37:02