4) T1 Relaxation Measurement – Concept, Data collection, Data Analysis
Have you ever wondered why your 1H integrals sometimes don’t come out to clean numbers? T1 (Longitudinal) relaxation is the constant required for your nuclear spins to relax back to equilibrium by a factor of e. Typically if one wants quantitative integrations, one must wait at least 5 times the T1 of your slowest relaxing protons. For organic chemists, often the most useful reason for knowing your T1 (longitudinal) relaxation times is so that you can obtain clean integrations — If you have different types of 1H environments, and they have different relaxation properties, it is possible that your 1H integrals may not come out to clean numbers (For example, 2:3 ratio between a CH2 and CH3 group). This video goes through the concept of T1 relaxation, and how to measure T1 for each particular 1H environment. Also, we use MestreNova for data processing. The methods used for processing T1 relaxation data in MNova can be applied to other stacked pseudo-2d experiments, like kinetics, diffusion, T2, T1rho, etc.
