Write a report on Experiment 5: Synthesis of a Cobaltoxime Derivatives.

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The UV-Vis absorption spectrum of the synthesized [Co(dmgH)(dmgH2)Br2], [Co(dmgH)2(4-tBuPy)Br] and [Co(dmgH)2(4-tBuPy)Et] complexes are shown in Figures 1-3 respectively. The absorption in the visible region originates from the synthesized Co3+ complexes, since the dimethylglyoxime is colorless and absorbs in the UV region.[2] For all the synthetized complexes, the prominent absorptions in the near ultraviolet region, that is responsible for the color of the compounds, are not simple d-d transitions.[2-3] For [Co(dmgH)(dmgH2)Br2], there is strong absorption in 300-400nm region, with the absorption maximum at ╬╗max = 299nm originating from charge-transfer (CT) bands.[2-3] This broad absorption dominates the spectrum and the d-d transitions cannot be identified. It should be noted that he equatorial ligand has the absorption maximum just below range in which spectra was collected (250-800 nm). The [Co(dmgH)2(4-tBuPy)Br] and [Co(dmgH)2(4-tBuPy)Et] also have the dominant...

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