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Access to instruments
- Instruments are accessible to anyone who has been trained on their use by the Nuclear Magnetic Resonance (NMR) laboratory staff and who has a current account.
- No unauthorized training allowed.
- We need to have a budget number (EFS string) on file to create your NMR account.
- If you do not have a budget number, applying for a Chemistry Department Sales Card Application & Temporary Stockroom Card will create one.
- Each authorized user is given a six-letter login code and computer account for scheduling time on the instruments and for using the instruments.
- Please use a secure password.
- Do not let anyone else use your account.
- Violators will lose access privileges for a one-week period.
After hours access via U-card
U-cards are activated on a weekly basis, usually on Thursday.
- You must use a computer on the University network.
- Complete this U-card form
- Only send the information once.
- If your U-card does not work, check with Letitia Yao in the Nuclear Magnetic Resonance laboratory.
- If you are a newly-trained user of the Mass Spectrometry Laboratory or the X-Ray Crystallographic Laboratory, and you already have access to the Nuclear Magnetic Resonance laboratory, send an email to Letitia Yao, email@example.com, to add your card number to the doors for those laboratories.
- Do not resubmit your card number.
- No food or beverages near the spectrometers or workstations.
- Do not leave your NMR tubes in the laboratory.
- If a sample breaks in the magnet, contact the NMR lab staff immediately so the probe can be cleaned.
- This will minimize probe damage from corrosive solvents.
- Repairs for any damage to the probes resulting from user error are charged to the user group.
- All users must abide by the scheduling restrictions posted in the lab.
- All VI-500 users must lock on the D2O dummy sample when finished with the spectrometer.
- If the dummy sample breaks, contact the NMR lab staff so it can be replaced with an appropriate tube.
- Non-standard experiments (VT work, exotic nuclei) must be scheduled one week in advance with the NMR lab staff.
- Read the manuals.
- Do not use chipped or cracked NMR tubes.
- Use 7" or 8" tubes. For the VI-300, 8" tubes are mandatory.
- Use 507PP (300-400 MHz) or 528PP (500 MHz) NMR tubes on all the instruments to prevent damage to the probes.
- The NMR lab does not provide solvents or other supplies for your use.
- Standard shims on the Varian instruments are determined on a sample 50 mm in height (0.70 mL); for the Bruker instruments, 40 mm (0.55 mL).
- Shorter samples require additional time to shim.
- Longer samples waste solvent and dilute the concentration.
Variable temperature work
- Separate training is required for variable temperature work.
- For sample preparation, use no more than 0.45 mL of solvent.
- Be aware of the temperature limitations on the probe you are using. If unsure, ask!!
- Always use new 528 NMR tubes and the special VT spinner for VT work.
- Old tubes may be scratched and more likely to break.
- For variable temperature work, you must schedule enough instrument time to bring the temperature back to room temperature when you are finished.
- On the AV-500, this is 300K; on the AM-400, this is 298K.
- See sign posted on the instrument for maximum allowable scans per experiment.
- 1-hour limit during the daytime
- 3-hours maximum during the nighttime
- 1-hour limit during the daytime
- 4-hours maximum during the nighttime
AM-400, VI-500, AV-500
- Monday-Friday, 8 a.m. to 6 p.m.
- 6 slots per user
- can be reserved up to 24-hours in advance
- Monday-Friday, 6 p.m. to 8 a.m., and weekends
- unlimited slots
All spectrometers for nights and weekends
- reserve 2 weeks in advance
- Holidays: weekend restrictions in effect
Instrument time charges
Instrument usage is charged to your EFS string:
|AM-400||$8.10 day, $4.05 night/weekend|
|VI-500/AV-500||$9.00 day, $4.50 night/weekend|
- night rates begin at 8 p.m. and end at 8 a.m.
- Operator time is $60 per hour for any instruction, at all times.
- You will be charged for any time that is scheduled, but not used.
- Cancel any unused time.
- Samples may be submitted to the NMR staff to run for you.
- Data is saved to CD-ROM when data directories are full.
- The CD-ROMs are loaded and constantly accessible through the [Main Menu] - [File] - [Oldfids] menu buttons.
- For data older than this, the NMR lab staff can load the appropriate CD- ROM, then accessible through the [Special] menu option.
Nuclear Magnetic Resonance Laboratory
Department of Chemistry
University of Minnesota
207 Pleasant St SE
Minneapolis, MN 55455
- Nuclear Magnetic Resonance Laboratory
- 194 & 196 Kolthoff Hall, 225 Pleasant St SE
- Letitia Yao, Ph.D., Director
- (612) 625-8374