Proton spin relaxation in some paramagnetic transition-metal acetylacetonate complexes. Comparison between theory and experiment

✍ Scribed by David M. Doddrell; David T. Pegg; M.Robin Bendall; Anthony K. Gregson

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 437 KB
• Volume: 40
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(76)80138-8

✦ Synopsis

Proton spin-lattice (T1) and spin-spin (T2) relaxation times have been measured for CH3 protons in a series of paramagnetic transition-meta! acetylacetonatc complexes and the results interpreted in terms of current relaxation theory. r&the correlation time for molecular reorientation, was estimated from the 13C T1 in the analogous diamaSnetic Co(III) and Pd(!Z) complexes. Using this approach and treating in dctarl the effects of fast CH3 group internal motion good agreement is obtained between theory and experiment. In all cases electron-nuclear dipolar coupling dominates Tl whereas the hyperfine contribution can be important for Ta.