By Rudi Van Eldik

Content material: conceal -- ADVISORY BOARD -- copyright -- desk of contents -- PREFACE -- ERRATUM -- advent: basic thought OF NUCLEAR leisure -- I. what's Nuclear rest? -- A. LONGITUDINAL leisure -- B. TRANSVERSE rest -- C. THE ROTATING body ... -- D. CROSS-RELAXATION ... -- E. CROSS-CORRELATION ... -- II. leisure Mechanisms -- A. interplay WITH RAN ... -- B. leisure via CHEMIC ... -- C. SCALAR rest OF ... -- D. rest by means of DIPOLAR ... -- E. QUADRUPOLAR chill out ... -- III. Water NMRD in Diamagnetic platforms -- A. PUREWATER -- B. WATER IN PROTEIN SOL ... -- REFERENCES 1 -- NMR leisure IN answer OF PARAMAGNETIC COMPLEXES:RECENT THEORETICAL growth FOR S=1 -- I. creation -- II. The ''Classical'' thought -- A. THE SOLOMONB̂LOEMB ... -- B. THE transformed SOLOMON ... -- C. VALIDITY OF the purpose- ... -- D. THE REDFIELD sit back ... -- III. The Curie-Spin leisure and similar issues -- A. THE CURIE-SPIN chill out ... -- B. PARAMAGNETIC move ... -- IV. the final (Slow-Motion) concept -- A. THE REDFIELD restrict AND ... -- B. THE LATTICE AND THE ZFS -- C. the results OF ZFS ... -- V. Electron Spin leisure and the PRE in a few restricting instances -- A. hugely SYMMETRIC SYS ... -- B. SLOWLY-ROTATING, LOW ... -- C. RAPIDLY-ROTATING SYS ... -- D. ELECTRON SPIN DYNA ... -- VI. Spin-Dynamics versions -- VII. Outer-Sphere leisure -- A. normal facets -- B. OUTER-SPHERE PRE AND ... -- C. OUTER-SPHERE chill out ... -- D. CHEMICAL alternate -- VIII. Molecular Vibrations, Electron Spin rest and the PRE -- IX. Concluding comments -- ACKNOWLEDGMENTS 2 -- REFERENCES 2 -- 1H NMRD PROFILES OF PARAMAGNETIC COMPLEXES AND METALLOPROTEINS -- I. From the NMRD Profile to the Electron leisure Mechanism -- A. DEPENDENCE OF THE ... -- B. THE foundation OF opt for ... -- C. ELECTRON rest ... -- II. From the NMRD Profile to the Structural and Dynamic Parameters -- A. DEPENDENCE OF THE ... -- B. COPPER COMPLEXES ... -- C. IRON COMPLEXES AND ... -- D. MANGANESE advanced ... -- E. different TRANSITION ... -- F. GADOLINIUM COMPLEXES ... -- III. Magnetic Coupled structures -- A. NUCLEAR AND go with ... -- B. EXAMPLES -- IV. Conclusions -- ACKNOWLEDGMENTS three -- REFERENCES three -- Gd(III)-BASED distinction brokers FOR MRI -- I. basic comments -- II. Contributions to the Relaxivity -- A. INNER-SPHERE CONTRI ... -- B. OUTER-SPHERE CONTRI ... -- C. SECOND-SPHERE CONTR

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Maxwell, D. E. Phys. Rev. 1951, 84, 1246. Look, D. ; Lowe, I. J. J. Chem. Phys. 1966, 44, 2995. Noggle, J. ; Schirmer, R. E. ‘‘The Nuclear Overhauser E¡ect. Chemical Applications’’; Academic Press: New York, 1971, Chapter 1. Delpuech, J. J. ‘‘Timescales in NMR: Nuclear Site Exchange and Dynamics NMR, in Dynamics of Solutions and Fluids Mixtures by NMR’’; Ed. Delpuech, J. ; Wiley: Chichester, 1995, pp. 73^172. ; Williamson, M. ‘‘The Nuclear Overhauser E¡ect in Structural and Conformational Analysis’’; VCH Publishers: New York, 1989.

In an isotropic liquid, the former interaction gives rise to J-split doublets, while the dipolar interaction acts as a relaxation mechanism. For the discussion of such a system, the appropriate sixteen-dimensional basis set can for example consist of the unit operator, E, the operators corresponding to the Cartesian components of the two spins, Ix, Iy , Iz, Nx, Ny, Nz and the products of the components of I and the components of N (49). These sixteen operators span the Liouville space for our twospin system.

This mechanism is identical to the one arising from the ‘‘contact interaction’’ between an unpaired electron and a nuclear spin (41). In that case, the hyper¢ne coupling (generally denoted by ASC or Ac; and exists only if the electron density is non-zero at the considered nucleus, hence the terminology of ‘‘contact’’) replaces the J coupling and the earlier statement (i) may be untrue because it so happens that T2S becomes very short. In that case, dispersion curves provide some information about electronic relaxation.

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