First slide

Crystal field theory

Question

The value of $Δ_{o}$ for ${RhCl}_{6}^{3 -}$ is 243 kJ/mol. What wavelength of light will promote an electron and the colour of the complex respectively are

Moderate

A

511 nm, Blue
B

525 nm, Green
C

645 nm, Yellow
D

511 nm, Orange

Solution

$\begin{array}{r} Δ_{o} {RhCl}_{6}^{- 3} is 243 kJ / mol \\ E = \frac{hc}{λ} \\ λ = \frac{6 .626 \times 10^{- 34} \times 3 \times 10^{8}}{234 \times 10^{3}} \end{array}$
= 511 nm. Nearest color is orange.

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