Experiment 1 and 2

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Korleyfah Mouth
Chem 331 Thursday 2:00pm
Dr. Lijuan Li
20A Preparation of CuCl2~2DMSO
20B Preparation of RuCl2~4DMSO

Abstract In order to synthesize our metal complexes, we were able to make both Copper and Ruthenium metals. From this, we combined each metal complex with DMSO by refluxing the compound. The metal complexes were analyzed through their melting point and IR spectroscopy to determine whether the metal bonded to a Sulfur atom or an Oxygen atom of the DMSO. After analyzing the IR spectrum, it was determined that S=O shifted to a lower wavenumber in CuCl2~2DMSO and that S=O shifted to a higher wavenumber in RuCl2~4DMSO.

Introduction Depending on the metal, it will bond to DMSO through its oxygen or sulfur atom. This
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IR spectroscopy was used to analyze the product and an emission spectrum was obtained.

Results and Discussion Product
Theoretical yield
Actual yield
Percent yield
Melting point °C
0.189 grams
0.082 grams
43.38 %
Frequency (cm−1)
Bond responsible
(DMSO) 1017.65
S=O stretching
(RuCl2~4DMSO) 1105.54
S=O stretching

When analyzing the IR spectrum of Ruthenium complex with DMSO, the prominent peak is presented at 1105.54 cm−1. This peak indicates that S=O bonded in DMSO. For DMSO, the frequency is around 1050 cm−1. From our spectra obtained for DMSO where the S=O peak is at 1017.65 cm−1. Since the bond appears at a higher frequency, this shows that the bond is strengthened by the reaction. This indicates that when the copper metal was combined with DMSO, it bonded with the Sulfur atom. Combining ruthenium with sulfur atom caused it to donate a pi electron as a back donation.

Conclusions From both experiments, we were able to detect which Sulfur and Oxygen atom bonded to the metal. Copper metal was added to DMSO to bond with the oxygen by weakening the S=O therefore lowering the IR spectrum. As for Ruthenium metal, it was added to DMSO to bond with the sulfur compound, strengthening the S=O therefore increasing the IR spectrum. Based on the IR spectrums and melting points, my product for both metal were pure. References

Boschmann, E; Wollaston, G.J. Chem. Edu. 1982, 59,57

Ebsworth, E. A. V.; Ranking, D.W.H.; Cradock,
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