ChemLab8 - Co(NH 3 ) 6 . Complex C had the third highest...

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The Spectrochemical Series By Sam Alperin Lab Instructor: Dr. Munkenbeck November 30, 2008
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Results and Discussion: After successfully synthesizing our cobalt complex A, the wavelengths of maximum absorbance were measured, Cobalt Complex Color Maximum Wavelength(nm) Intensity A Light Magenta 523-529 .625 B Light Orange 468-473 .278 C Light Pink 482-510 .108 D Light Pink 543-549 .125 E Orangeish Pink 480-495 .295 The crystal field splitting was calculated for each of the cobalt complexes using the formula o hc = λ J nm 19 ^ 10 * 779 . 3 526 ) 8 ^ 10 * 00 . 3 )( 34 ^ 10 * 626 . 6 ( - = - Cobalt Complex Crystal Field Splitting (J) A 3.779*10^-19 B 4.225*10^-19 C 4.008*10^-19 D 3.641*10^-19 E 4.077*10^-19 Therefore since complex A has the second highest crystal field splitting, it must have been Co(NH 3 ) 5 Cl - . Complex B had the highest crystal field splitting, and was therefore
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Unformatted text preview: Co(NH 3 ) 6 . Complex C had the third highest crystal field splitting and was therefore identified as Co(NH 3 ) 5 F-. Complex D, with it lowest crystal field splitting, was identified as Co(NH 3 ) 5 Br-. Lastly, Complex E was identified as Co(NH 3 ) 5 (H 2 0). This was all based on this spectrochemical series (where the crystal field splitting increases from left to right): Br-<Cl-<F-<H 2 O<NH 3 Conclusion : Each of the five cobalt complexes was identified after using their maximum absorbed wavelengths to calculate their crystal field splitting. Our cobalt complex, complex A, was identified as Co(NH 3 ) 5 Cl- and cobalt complex B was identified as Co(NH 3 ) 6 ....
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This note was uploaded on 03/10/2009 for the course -2 2610 taught by Professor Mikels,j. during the Fall '09 term at Cornell University (Engineering School).

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ChemLab8 - Co(NH 3 ) 6 . Complex C had the third highest...

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