course hero The_Spectrochemical_Series[1]

course hero The_Spectrochemical_Series[1] - in the 5d...

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The Spectrochemical Series November 26, 2007
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Results and Discussion: Each group purified one of two unidentified cobalt complexes having the general formula Co(NH 3 )5X^ y+ . Wavelengths of maximum absorbance in the visible spectrum of the two cobalt complexes in addition to three other provided complexes (also having the same general formula) were measured using a computer interface spectrometer. Cobalt Complex Wavelength Absorbance A 465.75 nm B 473.61 nm green cuvet 486.72 nm yellow cuvet 489.63 nm orange cuvet 548.98 nm Because the metal ion in each complex is held constant, the magnitude of crystal field splitting is only dependent upon on the changing ligands in this experiment. The magnitudes of ligands used in the experiment are as follows: Brˉ < Clˉ < Fˉ <H 2 O < NH 3 , known as the Spectrochemical series, where NH 3 has the strongest crystal field splitting. The difference in wavelength absorbance in each compound reflects the varying energies
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Unformatted text preview: in the 5d orbitals. The identities of the unknown complexes were then determined using the formula E = hc/. Based on this equation, the ligands with shortest wavelengths will have the largest energies and create the most crystal field splitting. E = hc/ where h = 6.626 * 10^-34 Js, c= 2.99 * 10^8m/s Cobalt Complex A: E = (6.626 * 10^-34 Js)(2.99 * 10 ^8 m/s) = 4.25 * 10 ^ -19 J (4.66 * 10^-7 m) Complex E A 4.25 * 10 ^ -19 J B 4.18 * 10 ^ -19 J green cuvet 4.07 * 10 ^ -19 J yellow cuvet 4.05 * 10 ^ -19 J orange cuvet 3.61* 10 ^ - 19 J Conclusions: The identities of the complexes based on their relative wavelengths were determined to be: A = [Co(NH 3 ) 5 NH 3 ]^ 3+ B = [Co(NH 3 ) 5 H 2 O]^ 3+ green cuvet = [Co(NH 3 ) 5 F]^ 2+ yellow cuvet = [Co(NH 3 ) 5 Cl]^ 2+ orange cuvet = [Co(NH 3 ) 5 Br]^ 2+...
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