DMF－H＿2O和DMF－D＿2O体系中￣（14）N弛豫的动态同位素效应的研究

STUDY OF THE ISOTOPE EFFECT ON ^(14)N RELAXATION IN DMF／H_2O AND DMF／D_2O SYSTEMS

本文测定了ＤＭＦ－Ｈ＿２Ｏ和ＤＭＦ－Ｄ＿２Ｏ体系在全部浓度范围内（摩尔分数为０～１）ＤＭＦ分子中四极核￣（１４）Ｎ的弛豫时间，讨论了弛豫的溶剂同位素效应和影响四极核弛豫的因素。研究结果表明，体系中￣（１４）Ｎ的弛豫与溶剂水分子的动力学行为有着密切的联系，在无限稀释条件下溶质分子的运动完全受溶剂分子的控制．

In the present paper，the dynamic isotope effect of ^(14)N relaxation ofDMF／H_2O（D_2O）system is reportcd．The ^(14)N rclaxation times of DMF in DMF／H_2Oand DMF／D_2O systems have been measured through all composition range（mole fraction of DMF from 0 to 1）．The solvent isotope effect on relaxation and thefactors affecting the quadrupole relaxation are discussed .The results suggcst that in thegiven system there is a close relationship between the ^(14)N relaxation and the kinetics of,solvent water．Under infinite dilutions，the kinetics of thc solute molcculcs are controlledcomplctely by the solvent molecules。