7.) a.) The pentachlorocuprate anion in [Cr(en)3][CuCl5] can exist in either tri

Question

7.) a.) The pentachlorocuprate anion in [Cr(en)3][CuCl5] can exist in either trigonal bipyramidal or square pyramidal geometries. What are the oxidation states for the Cr and Cu in this complex ion pair (keep in mind the common oxidation states of Cr and Cu)? Oxidation state of Cr in [Cr(en)3] = (5 marks) Oxidation state of Cu in [CuCl5] = (5 marks) b.) The two isomers of the [CuCl5] anion can be distinguished by their UV-vis spectra. Draw out the crystal field splitting patterns for both geometries, with orbital labels and electrons filled in (15 marks each). Crystal Field Splitting Diagrams: Trigonal Bipyramidal Square Pyramidal

Explanation / Answer

7)
[Cr(en)3]

x + 3*0 = 0
x = 0

so Cr O.st. is o

[CuCl5]

x+5*(-1) = 0

x = +5
so Cu O.st. is +5

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