Lab~18 - Experiment 18 Synthesis of Transition Metal Coordination Complexes The purpose of first portion of this experiment was to

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Experiment 18: Synthesis of Transition Metal Coordination Complexes The purpose of first portion of this experiment was to synthesize [Co(NH3)6]Cl3 and [Co(NH3)5Cl]Cl2 and measure the absorption spectrum for each compound in order to determine the ligand field strength. The purpose of the second portion of the experiment was to synthesize and isolate the cis- and trans- geometric isomers of [Co(en)2Cl2]Cl and obtain the absorption spectrum using a spectrophotometer. In part 1 [Co(NH3)6]Cl3 was synthesized according to the following reaction. 2CoCl2·6H2O + 2NH4Cl + 10NH3 + H2O2 → 2[Co(NH3)6]Cl3 + 14H2O The limiting reactant in this process was the CoCl2·6H2O and 0.187g of product were formed, lending only 15.7% yield. The product was an orange precipitate that exhibited the maximum absorbance at 471nm. This wavelength corresponds to blue-green light, which is the complementary to orange as is expected since substances absorb the most light at the wavelength complementary to the observed color. The percent yield was so low mostly because a large portion of the
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This note was uploaded on 04/20/2010 for the course CHEM 1A/ 1 Chem Lab taught by Professor Van koppen during the Spring '10 term at UCSB.

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Lab~18 - Experiment 18 Synthesis of Transition Metal Coordination Complexes The purpose of first portion of this experiment was to

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