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 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, letitia@nmr.chem.umn.edu, to add your card number to the doors for those laboratories.
    • Do not resubmit your card number.

General policies

  • 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.

Sample preparation

  • Do not use chipped or cracked NMR tubes.
  • Use 507PP or 528PP 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 50mm in height (0.70 mL); for the Bruker instruments, 40mm (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.

Use restrictions

VI-300

  • See sign posted on the instrument for maximum allowable scans per experiment.

AX-400

  • 1-hour limit during the daytime
  • 3-hours maximum during the nighttime

HD-500

  • 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:

Instrument Hourly Rates
VI-300 $7.20 day/night/weekend
AM-400 $8.10 day, $4.05 night/weekend
AX-400 $8.10 day/night/weekend
VI-500/AV-500 $9.00 day, $4.50 night/weekend
HD-500 $9.00 day/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.

Service work

  • Samples may be submitted to the NMR staff to run for you.

Archiving data

  • 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.

Contact

  • Mailing address
    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
    • yaoxx006@umn.edu
    • (612) 625-8374