Are you using a cryoprobe? Radiation damping can cause major issues for the
highly protonated Ethylene Glycol sample. Please see:
Findeisen, M., Brand, T., & Berger, S. (2007). A 1H-NMR thermometer suitable
for cryoprobes. Magnetic Resonance in Chemistry, 45(2), 175–178.
https://doi.org/10.1002/MRC.1941
Karschin, N., Krenek, S., Heyer, D., & Griesinger, C. (2022). Extension and
improvement of the methanol-d4 NMR thermometer calibration. Magnetic Resonance
in Chemistry, 60(2), 203–209.
https://doi.org/10.1002/MRC.5216
What temperature range do you require?
Alex
[The Ohio State University]
Dr Alexandar L Hansen<
https://osu.academia.edu/AlexandarHansen
Lead Research Scientist
CCIC & Gateway NMR Facility
R381 CBEC, 151 W Woodruff Ave, Columbus, OH 43210
614.292.7133 Office / 716.341.8476 Mobile
hansen.434_at_osu.edu<mailto:hansen.434_at_osu.edu> ccic.ohio-state.edu
Pronouns: he/him/his
“Who's ready to make some science?” – Cave Johnson
From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> On Behalf Of Walter Zhang
Sent: Friday, August 18, 2023 3:10 PM
To: main_at_ammrl.groups.io
Subject: [AMMRL] 99.8% MeOD vs 80% Ethylene Glycol
Dear All,
I need to use 80% Ethylene Glycol for high temperature calibration.
Before I do the calibration, I compared it with 99.8% MeOD at 303 K.
When I set temperature to 303 K,
99.8% MeOD gives 303.03 K while 80% Ethylene Glycol gives 300.57 K
The difference between the two calibration samples is 2.46 K.
Is this normal?
Your comments are appreciated!
Best regards,
Weixing Zhang
St. Jude Children’s Research Hospital
Memphis, TN 38105
USA
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Received on Fri Aug 18 2023 - 16:44:19 MST