Topic: synthesis problem (Read 4104 times)

haichau · « **on:** July 28, 2009, 02:02:25 PM »

Can you explain why the wavelength increase when 4-aminothiophenol group substitute chlorine atom in heptamethine cyanide dyes ?
Example : ADS830WS has wavelength 819nm.When ADS830WS react with 4-aminothiophenol in DMSO ( a little NaOH added to mixture), the product ADS832WS has its wavelength 822nm (increase)_.Explain?
Thanks

sjb · « **Reply #1 on:** July 28, 2009, 03:38:15 PM »

What happens in terms of the molecule when the amino group substitutes the chlorine, or when base acts on the thiophenol?

haichau · « **Reply #2 on:** July 29, 2009, 10:29:13 AM »

I have an experiment.The reactants are ADS830WS ( wavelength:819nm), NaOH, 4-aminothiophenol.After finish this experiment, I have product ADS832WS which have wavelength 824nm.The structure of ADS832WS have different which that of ADS830WS is chlorine atom at meso position have been replaced by 4-aminothiophenyl ( from 4-aminothiophenol).Help me this explain this ?

sjb · « **Reply #3 on:** July 29, 2009, 03:06:07 PM »

Ahh, I misunderstood - do you now have 4-aminophenyl phenyl sulfide?

What is the nature of the electronic transition you're observing?

haichau · « **Reply #4 on:** July 30, 2009, 10:48:52 AM »

You can read this attachment obviously

Topic: synthesis problem (Read 4104 times)

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