Phosphorus-31 magnetic relaxation of inorganic orthophosphate in solution

✍ Scribed by R. Gaspar Jr.; E.R. Andrew

• Book ID: 103028143
• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 309 KB
• Volume: 170
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(90)87110-d

✦ Synopsis

Measurements have been made of the longitudinal 3'P magnetic relaxation of inorganic orthophosphate in H,O and D,O solutions at 121.5 MHz from 278 to 317 K. The phosphorus spin-lattice relaxation time is temperature dependent and dominated by dipolar and spin-rotation interactions to a different extent in the two solvents. The random reorientation of the orthophosphate molecule is responsible for modulation of both interactions. Relaxation parameters characterizing the molecular dynamics of orthophosphate in solution have been obtained by fitting the experimental data to a theoretical relaxation model. Activation energies characterizing the reonentational motion of the orthophosphate molecule are 12. I f 0.8 and I 1.1 t 0.8 kJ/mol in H,O and DzO, respectively.