What can be possible UV/VIS-radiation sensitive reaction for Cu-Al oxyhydroxide-ethanoates?

01 November 2020 0 8K Report

The reaction steps are

Electrolytic copper is oxidized with ambient air at ambient temperature, with 5% ethanoic acid (in water) solution, forming Cu(II) ethanoate. Air-oxidation is continued, and if Cu(II) hydroxide is formed, it is redissolved with same ethanoic acid solution. the solution is allowed to evaporate and copper to oxidize simultaneously until blue Cu(II) ethanoate crystals begin to precipitate

Al chips from machining operation (possibly window frame) is added to the saturated crystal-free Cu-ethanoate solution in excess amount to reduce Cu(II) ethanoate into Cu particles, the reaction taking place inside a closed PET vessel henceforth.

Upon complete reduction of Cu(II) ethanoate to metallic Cu particles, (and excess Al chips remaining)indicated as blue color or Cu(II) ethanoate is disappearing red-maroon metallic Cu Precipitates are forming; and some air is let to enter the vessel and produced gas (Chiefly hydrogen, if any) to vent out, under atmospheric pressure. Some precipitated Cu particles are oxidized back to ethanoate, then the vessel is closed, and the Cu(II) ethanoate again reacts with Al (to revert back to Metallic Cu particles) to form Al ethanoate, and likely Al-hydroxide.

This vessel opening-closing is continued until a thick white slurry of Al- hydroxide+ethanoate forms separate layers above metallic Cu particle layer (at closed-vessel state, all transitory Cu(II) ethanoate consumed). Then the Al-compound slurry layer is decanted , fresh 5% ethanoic acid (in water) added to vessel, Air as added and hydrogen/ other formed gas is allowed to vent out. steps included in 3 are kept repeating, step 4 is used only when a thick slurry forms.

Above steps are continued until the Cu content of reaction vessel no longer gets completely reduced to metallic Cu even when air supply is cut off and vessel is closed for a long time. Instead of Maroon Cu precipitates only, orange-yellow Cu(I) hydroxide or ethanoate also sustains inside the reaction vessel. Not much Oxidizable Al can be assumed inside vessel at this stage.

At this stage, the vessel contains two immiscible slurries- one containing Al-hydroxide and other containing a precipitate of Cu and Cu(I) hydroxide. When these two layers are agitated to suspension and one half of the transparent vessel is subject to solar radiation, the yellow-orange suspensions' vessel-wall adjacent layer that is exposed to solar radiation becomes near instantly blue-violet-maroon, the unexposed portion remain yellow-orange .

Any idea which reaction can be occurring due to solar radiation?

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