1. Geometrical Isomers of [CoCl 2 (en) 2 ] + Objectives: (1)Produce two geometric isomers of an inorganic complex (2)Look for differences in their properties

2. Geometrical Isomers of [CoCl 2 (en) 2 ] + GreenViolet

3. Beer-Lambert Law A = log I 0 / I A =  L c molar extinction coeff. x pathlength x concentration predicts strength of absorption  – units of M -1 cm -1

4. fac-mer Geometrical Isomers facial meridional

5. Optical Isomers: Enantiomers

6. Magnitude of  ’s for trans and cis Inversion center Symmetry-forbidden No inversion center Not forbidden Will  ’s of trans absorptions be smaller than those of cis?

7. Summary 1. Synthesize the two different geometrical isomers of [CoCl 2 (en) 2 ] + 2. Analyze different properties of the two isomers, especially wavelengths of absorptions and magnitudes of extinction coefficients