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From: mikew@wheeler.wrcr.unr.edu (Mike Whitbeck)
Newsgroups: sci.chem,sci.bio
Subject: Re: Compound whose UV/VIS spectrum changes with temperature?
Message-ID: <4509@tahoe.unr.edu>
Date: 7 Sep 90 00:34:00 GMT
References: <3596@leah.Albany.Edu>
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Reply-To: mikew@wheeler.UUCP (Mike Whitbeck)
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In article <3596@leah.Albany.Edu> bk7295@leah.Albany.Edu (Brian A. Kell) writes:
|I have a collegue who is teaching some undergraduate students
|about lab techniques, instruments, protocols, etc.  She's interested
|in acquiring some cheap organic or inorganic compound whose UV/VIS spectrum
|changes with temperature when in aqueous solution, say in the range 0-90 C,
|in order to demonstrate the temperature-controlled spectrophotometer.
|
|Any ideas?  This could be anything, as long as it is cheap and safe.
|
|Thanks in advance.  I'll summarize if there's enough interest.

Just about anything that polymerizes (or even dimerizes) will do this.
Try 2-methyl-2-nitroso-propane (aka t-butyl nitroso)

                 CH3
                  |
            CH3---+----CH3
                  |
                  NO

easy to make, can also buy - used in NMR spectrometry

solid is colorless (white crystals) but vapor/liquid is intense 
blue (strong absorption in red ca 600 nm as I recall) melts near room
temp, fairly high v.p. as well.

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|Mike Whitbeck             |                              |
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