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Thread: mystery behind colours?

  1. #1 mystery behind colours? 
    Forum Freshman vedmecum's Avatar
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    recently in gravimetric experiment i made nickel dmg complex which was red coloured. i left it in dessicator for week. i turned white(yellowish). while trying to wash the crucible(filter used in gravimetry) as soon as i poured water it turned red again. whats happening


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    Forum Masters Degree Numsgil's Avatar
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    Koolaid powder does that too Not sure why.


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  4. #3  
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    What is "dmg"?
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  5. #4  
    Forum Freshman vedmecum's Avatar
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    DMG -dimethyl glyoxime .

    i posted the same on another science forum and got these ans .-

    well, obviously the hydrate of the complex is red and the anhydrate is white.

    in the dessicatior the water is removed turning the red hydrate into the white anhydrate. when washing the crucible water was reintriduced and the hydrate was fromed again.


    i am trying to relate these abnormal color shift with CFSE (crystal field stablisation energy ) . we noticed that color shifted from high wavelength to low wavelength region i.e. with passage of time energy required to excite electron from low energy level to high energy level decreases . these will only happen if any other chemical species (may me O2 or any other ) attack on complex or the extent of bonding b/n Ni and DMG decreases . BUT THESE IS COMPLETELY AN APPARENT GUESS.
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