These solutions may offer step-by-step problem-solving explanations or good writing examples that include modern styles of formatting and construction of bibliographies out of text citations and references. Students may use these solutions for personal skill-building and practice. Unethical use is strictly forbidden.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. 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 λmax = 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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