UW CHEMISTRY NMR
Announcments & Equipment Logs
Spectrometer
UPDATE ! GG500 – VT SYSTEM UP
Dear Users It turned out to be a simple problem that caused the VT system not controlling the temperature. The instrument is working normally now. Please go ahead and reserve time for immediate use. Please remember that an important hardware upgrade is happening tomorrow, and the instrument won’t be ready until Wednesday. NMR Facility […]
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ALERT ! GG500 – VT MALFUNCTION
The Chiller for this unit is not running as expected, leading to no Temperature control. The sudden deterioration of shim performance some have reported is most probably tied to this. I will post an update once the issue is resolved. The instrument cannot produce useable data because of this and so, it is blocked off […]
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NEWS ! NEW 500 NMR SYSTEM INSTALLATION SCHEDULED FOR NEXT WEEK
Dear Users This is in continuation of the announcement I made sometime ago about the imminent arrival of a brand new 500 MHz NMR spectrometer to our facility. Starting the afternoon of tomorrow, Friday the 3rd, a series of events will take place : The AV500 CONSOLE will be shut down and retired permanently (the […]
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UPDATE ! AV301 : TOPSHIM TEST LOOKS GOOD
Dear Users I managed to get hold of six sample tubes of same compound in CDCl3, (thanks to the kind help from Chem Lab Techs, David and Lance) to test the Topshim consistency. In my experience, the shimming is consistent and reliable. Below is a snapshot of the aliphatic region from all the six samples […]
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UPDATE ! AV301 : TOPSHIM SHOULD WORK WITH WEAK SOLVENTS NOW
Dear Users Thanks to a generous donation of a crucial component from a fellow public University like ours, I could revive the ability for this instrument to do meaningful Topshim based shimming on weak solvents like CDCl3. The results based on the tests I ran on a few samples at my disposal and a few […]
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PERSISTENT TOPSHIM PROBLEMS – BRIEFLY EXPLAINED…
Dear Users While AV301 instrument has been offline for almost four weeks, you might have also noticed that people complain about Topshim failure on AV500 and AV300. AV301 was taken down to address two complex problems, one is the failure of Topshim with 2H based solvents (i.e. most of the samples used) and a hardware […]
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UPDATE ON AV500 AND GG500
Dear Users : AV500 : We have swapped in the triple resonance TBI-1H {13C,X} probehead. Please take a moment to look at the Summary sheet that is displayed on the console box behind the computer. Please get in touch with one of the facility staff if you have any questions. This probe can perform Topshim […]
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PREPARING FOR 500 MHz INSTRUMENT UPGRADES
Dear Users Recently, some of you might have seen a Post in this space about oncoming instrument Upgrades in the 500 MHz category. Here is a link to that roadmap, in case you missed it. To summarize : Beginning of the New Year 2023 We will be left with two modern 500 MHz spectrometers : […]
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ALERT ! AV301 : SYSTEM WILL BE OUT OF ACTION…FOR A DAY OR SO
Dear Users I have been receiving sporadic complaints that the Locking operation is not reliable as well as Topshim is giving ‘iffy’ results. I briefly looked at the issue this morning and I am also not very happy at the shim results. Since there are a few moving parts to this subtle problem (the failure […]
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AV500 : TEMPORARY SAMPLE HANDLING GLITCH RESOLVED…
System back to normal. Lock system and other vitals are normal. NMR Facility Manager 10/21/22
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