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Temperature Controlled Rate Studies of Co(salen) Reversible Oxygen Binding. By Philip Chuang. Background Information. Co(salen) is Cobalt N,N’-bis (salicylaldehyde) ethylenediamine Ability to reversibly bind oxygen discovered by Tsumaki in 1938 1 A square planar dioxygen carrier
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By Philip Chuang
Procedure derived from Reference 4
UV-VIS of Inactive Co(salen) in DMSO in atmosphere
UV-Vis of Inactive Co(salen) in DMSO in N2 from literature5
The UV spectra indicates that the Inactive product was obtained.
Differences between UV spectra likely due to availability of Oxygen in the DMSO solution
H-NMR of Active Product in dDMSO
H-NMR of Inactive Product in dDMSO
-The H-NMRs did not correspond to predicted H-NMRs
-Conclusive Identification from H-NMR unobtainable
-Future improvement: prepare H-NMR in inert atmosphere, include C13 NMR
IR Spectra of inactive Co(salen) from Unniversity of Wimona6
IR spectra of Inactive Co(salen)
With the exception of the C-H peak at 3000, and the nujol peaks at 1500, 1400 and 700 cm-1 look similar
Further reinforces likelihood of obtaining Inactive Product
Absorbance vs Time graph of oxygenated Co(salen) in CHCl3 at 150C
Absorbance vs. Time graph of oxygenated Co(salen in CHCl3 at 150C, excluding first 8 data points
The first 8 data points were removed
Not enough time given to allow temperature to equilibrate
Absorbance vs. Time graph of oxygenated Co(salen) in CHCl3 at 500C
Absorbance vs. Time graph of oxygenated Co(salen) in CHCl3 at 500C without first 8 data points
Again, the first 8 data points were discarded.
Not enough time was given for temperature to equilibrate
-LN Absorbance vs Time plot for 150C deoxygenation of Inactive Co(salen)
-LN Absorbance vs. Time plot for 500C deoxygenation of Inactive Co(salen)
The slope of the –LN Absorbance vs. Time plot yields the rate constant of a first order reaction.
Absorbance vs. Time plot for Inactive Co(salen) in DMSO at 150C
-LN Absorbance vs. Time plot for Inactive Co(salen) in DMSO at 150C
No Data points were removed
For the DMSO runs, temperature was allowed to equilibrate
Absorbance vs. Time graph of inactive Co(salen) in DMSO at 500C
Result was not workable, rate could not be calculated
Possible explanations in Discussion Section