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I think that most chemists will agree that doing
melting point determinations sucks big time. Especially when you have been putting it off for 6 months and have to do 22 in one day (yes I learnt my lesson and it took two days). Until recently I only knew of a few ways to determine melting points. My preferred method was to get a rough melting point using a
Kofler Hotbench followed by an accurate determination using a full-on old school Reichert melting point microscope. The microscope beats getting your compound into a melting point tube and watching it melt through a crappy magnifying glass. Firstly, you place your crystals between two wafer thin glass plates (very simple). Secondly, you get to see your beautiful crystals through the microscope. On one occasion I managed to have a small rainbow in my crystals which sure beats staring at a melting point tube. Nevertheless, melting point determinations suck so I have toyed with the idea of having a camera record the melting in my absence and then come back a couple of hours later and fast forwarding the movie to the melting point and recoding the numbers. Now that would be easy.
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As always someone else got the idea first and where I work now melting point determinations are fully automated using an
OptiMelt system. It records a little movie and prints out the numbers while you are at home watching
Buffy. Amazing stuff!
So what happened to the redundant Kofler Hotbench? I found it on display in the Departments historical collection of hopelessly ancient relics. Strange to think that where I worked only two months ago this was state of the art equipment. D!
8 comments:
It's great to have you back!
Thanks for this useful info on a very important instrument used in the practice of organic chemistry. What is cost of this amazing instrument?
Errrhhh I assume that the amazing instrument is the OptiMelt? I have no idea how much this piece will set you back. D
I have asked for a quote on OptiMelt. It costs roughly $1950 AUD plus postage and handling from the US to Australia. Available in the US for about $1675 AUD. Pls do not quote me on the price as it is subject to change from time to time.
What I dont understand is how can Optimelt REALLY be a solution to something I've been trying to figure out for months!!!
£1825!!
http://www.thelabwarehouse.com/ProductDetail.asp?ProductID=6825
I'm trying to find a cheap second hand one, could anyone point me in an inexpensive direction?
Does anybody knows where I could buy a Kofler bench in North America?
I bought an old Kofler bench at an auction today in Cincinnati. The seller obviously didn't know what it was. The description in the catalog said
"Brand: KOFLER HEIZBANK
Item Description: REICHER OVER HEAD LIGHT
Model: R3838
Specifications: 110V/ 60HZ
Width: 14''
Depth: 6''
Here's a link to the auction photo: http://www.fasttrackauctionpictures.com/kristin/photos/fta656/201.JPG
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