The synthesis of trans complex will be done during the first meeting, then characterization of trans-Cl and aquation will be on the second week. This is a two-week laboratory experiment. It also provides students the opportunity to see the energy and stability difference of geometric isomers. This laboratory experiment introduces inorganic chemistry undergraduate students to the synthesis and characterization of coordination compounds, geometric isomerism, ligand substitution, magnetism and d n electron configuration, and the use of UV-Vis spectroscopy for monitoring reaction progress. Example of geometric isomers with octahedral geometry The aquation product, Cl 2, is purple in color and has cis geometry. This allows us to monitor the substitution of chloride by water in the green trans-dichloro bis(ethylenediamine)cobalt(III) chloride, trans-Cl complex. Due to the relative inertness of octahedral cobalt(III) metal centers, their ligand substitution and isomerization reactions are slow compared to the complexes of many other transition metals. Octahedral cobalt(III) complexes that are low-spin d 6 configuration are diamagnetic and considered stable, having a filled t 2g subshell. Figure 1 shows an example of octahedral geometric isomers. Introduction Disubstituted planar and octahedral complexes exhibit both cis and trans stereochemistry.
0 kommentar(er)
