2CLabManual201303

The complex you will synthesize is trans coen2cl2cl a

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Unformatted text preview: tal coordination chemistry and have you synthesize a coordination compound. This synthesis will allow you to experience some of the common procedures used to prepare and isolate inorganic compounds. The complex you will synthesize is trans-[Co(en)2Cl2]Cl, a green-colored cobalt transition metal complex, which will be used to study spectrophotometry and kinetics in the experiments which follow. The principal oxidation states of cobalt are the +2 and +3 states. The aqueous [Co(H2O)6]3+ ion is very unstable because it is a powerful oxidizing agent and is readily reduced by water to [Co(H2O)6]2+: 4 [Co(H2O)6]3+ +2 H2O 4 [Co(H2O)6]2+ + O2 + 4 H+ However, the +3 oxidation state is stabilized by replacing the coordinated water molecules with less labile ligands such as NH3, NO, CN-, and NH2CH2CH2NH2 (en). A labile complex exchanges its ligands rapidly. Lability is associated with the d-electron configuration of the central metal. In general, ligands coordinated to a Co3+ ion do not dissociate from the Co3+ ion rapidly, and as a consequence, they are not easily replaced by other ligands. Thus, Co3+ complex...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.

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