A compound related to acetylacetone is 1,1,1-trifluoro- acetylacetone (abbreviated Htfa):

Htfa forms complexes in a manner similar to acetylacetone. Both Be2+ and Cu2+ form complexes with tfa-having the formula M(tfa)2. Two isomers are formed for each metal complex.
a. The Be2+ complexes are tetrahedral. Draw the two isomers of Be(tfa)2. What type of isomerism is exhibited by Be(tfa)2?
b. The Cu2+ complexes are square planar. Draw the two isomers of Cu(tfa)2. What type of isomerism is exhibited by Cu(tfa)2?

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