Lab #8 - The Spectrochemical Series

Lab #8 - The Spectrochemical Series - Results and...

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Results and Discussion: Transition metal complexes come in a variety of colors which arise from the absorption of visible light by the complexes. The color of the light absorbed is complementary to the color that is seen. The wavelength of the colors of the absorbed light can be calculated by the difference in energy (ΔE) using the equation E = hc / λ. The different energy levels that arise from transition metal complexes can be explained by the crystal field theory. The crystal field theory explains that when the negatively charged ligands are brought near the transition metal, the energies of the five degenerate d orbitals change by different amounts. The difference in energy of the orbitals is called the crystal field splitting (Δ). The magnitude of the crystal field splitting depends on the identity of the transition metal and the ligand. If the ligand is kept constant, the crystal field splitting varies according to a certain order called the spectrochemical series. The series increases in the following order… Br - < Cl - < F - < H 2 O < NH 3 An unidentified sample of one of the previous complexes (Complex B) was synthesized and purified in this lab by my group. The other (Complex A) was synthesized and purified by other groups in the lab. The wavelengths of maximum absorbance of these two complexes along wit the remaining (Complexes C, D & E) were measured.
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  • Fall '05
  • Chemistry, NH3, spectrochemical series, maximum absorbance, crystal field splitting, Purification of Complex B

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