Integrating a Smartphone and Molecular Modeling for Determining the Binding Constant and Stoichiometry Ratio of the Iron(II)–Phenanthroline Complex: An Activity for Analytical and Physical Chemistry Laboratories
| Autor: | Davi Serradella Vieira, Camilo L. M. Morais, Kássio M. G. Lima, Sérgio Ruschi Bergamachi Silva |
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| Rok vydání: | 2016 |
| Předmět: |
Molecular model
Chemistry Phenanthroline 05 social sciences Analytical chemistry 050301 education Linearity General Chemistry 010402 general chemistry 01 natural sciences Binding constant 0104 chemical sciences Education chemistry.chemical_compound Ultraviolet visible spectroscopy Molecule Physical chemistry Spectroscopy 0503 education Stoichiometry |
| Zdroj: | Journal of Chemical Education. 93:1760-1765 |
| ISSN: | 1938-1328 0021-9584 |
| Popis: | The binding constant and stoichiometry ratio for the formation of iron(II)–(1,10-phenanthroline) or iron(II)–o-phenanthroline complexes has been determined by a combination of a low-cost analytical method using a smartphone and a molecular modeling method as a laboratory experiment designed for analytical and physical chemistry courses. Intensity values were obtained from the digital images by measuring the RGB (red, green, blue) values (on a scale of 0–255 in intensity) of the samples between Fe(II) and o-phenanthroline using a digital camera from a smartphone. The R channel showed the best linearity for predicting the binding constant. For computational studies, iron(II) complexes using water molecules and 1,10-phenanthroline were used to evaluate the stability of the complex by varying the number of ligands. Complexes have been optimized by reaching a minimum amount of energy. It was possible to observe how stable the complexes are from the optimization calculations, including aspects about the achieve... |
| Databáze: | OpenAIRE |
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