Direct determination of Sn-119, Pt-115, Hg-199 and Pb-207 NMR correlation times from spin-lattice and spin-spin relaxation times

摘要

The NMR rotational correlation equations for dipolar relaxation between H-1 and either Sn-119, Pt-195, Hg-199 or Pb-207 have been solved for viscous solutions using the R-2/R-1 dipolar ratio. The rotational correlation times have been determined over the dipolar R-2/R-1 range of 1.1-1200 at field strengths of 4.7, 5.87, 6.35, 7.05, 8.45, 9.4, 11.75 and 14.1 T. The calculated correlation times at each field strength have been fitted to pairs of polynomials, tau(c)(ns) = a(0) + a(1)(R-2/R-1) + a(2)(R-2/R-1)(2) + a(3)(R-2/R-1)(3) + a(4)(R-2/R1(1))(4) that reproduce the correlation times from R-2/R-1 values at a given temperature. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 22]