Experiment 1 - Preparation and properties of some Cr(III)
complexes
Preparation of some chromium(III) complexes, either:
- [Cr(en)3]Cl3 and
K[CrEDTA(H2O)]
- [Cr(urea)6]Cl3 and
K3[Cr(NCS)6] or
- cis-[Cr(en)2Cl2]Cl.1.5 H2O
and
cis-K[Cr(ox)2(H2O)2].2H2O
The on-line display showing the use
of Tanabe-Sugano diagrams requires MDL CHIME 2.6 SP4 and IE 6 or
Netscape 7 as well as the Sun JAVA JDK/JRE 1.4 or above
Note as well that the display was set for a minimum resolution of
1024*768.
For the Java Run-time environment see the SUN JAVA site
The next page will display several frames:
- The top frame has a menu of about 10 complexes to select
from.
- The left frame displays the 3D molecular graphics.
- The middle frame shows the visible spectrum
- The right most frame shows the Tanabe-Sugano diagram for a
d3 complex
- The bottom frame is for input to allow calculation of the
Racah parameter B' and estimate the energies of the electronic
transitions.
If you are all set then continue
The complexes displayed above are:
- K3[Cr(ox)3]
- [Cr(urea)6]Cl3
- [Cr(en)3]Cl3
- [Cr(oxine)3
- Chromium glycinate
- cis-[Cr(en)2Cl2]Cl.1.5
H2O
- Cr(acac)3
- K[CrEDTA(H2O)]
- K3[Cr(NCS)6]
-
trans-K[Cr(ox)2(H2O)2].2H2O
-
cis-K[Cr(ox)2(H2O)2].2H2O
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Copyright © 2006 by Robert John Lancashire,
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Created and maintained by Prof. Robert J.
Lancashire,
The Department of Chemistry, University of the West Indies,
Mona Campus, Kingston 7, Jamaica.
Created October 2002. Links checked and/or last
modified 4th July 2006.
URL
http://wwwchem.uwimona.edu.jm/lab_manuals/CrTSexptnu/Crspectra.html