Based upon the energy of light absorbed, arrange these ligands in order of increasing strength from weakest to strongest. EXPERIMENT 11:
PREPARATİON O F COORDINATION COMPLEXES AND THE SPECTROCHEMICAL SERIES
Name
Instructor
Date
Section/Group:
Post-Lab Report (Use the In-lab observations to complete the laboratory report. Turn in to your Instructor when yoa have completed the report.) Instructions: For each complex, give the color, the estimated wavelength (λ a) of the color of the complex, the complementary color for this complex (Comp. Color), and the estimated wavelength )of the light absorbed by the complex. Do this for each metal ion used.
COPPER COMPLEXES
Ligand Added Complex Color Est. Comp. Color Est.
OH2 (control)
NH3
DMG
en
Cl-
SCN-
Br
edta
OH
ox
NO2-tartrateS2,O3- (thio)
Post Lab Questions:
1. Give the electronic coefiguration of
A. Cu L.
B. NP
2. Which of these ions, if any, would be expected to form high-spin or low-spin complexes? Explain why or why not.
3. Turquoise, CuAl,(PO),(OH), 5HO, is hydrated copper aluminum phosphate. It is a valuable mineral and is perhaps the most valuable nontransparent mineral in the jewelry trade. The color of turquoise varies between pale green and turquoise, which is where the color got its name.
4. Why would turquoise commonly change colors when exposed to skin oils from normal jewelry wear?
5. Based upon your recent experiments, what might an unscrupulous (soak) a low-grade pale-green turquoise with to cause it to change into a much more valuable turquoise color? (This is technically illegal)