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以~(199)Sn和~(23)Na核磁共振研究了Na_4Sn_9-乙二胺体系中加入M(acacen)(M=Cu~(2+),Ni~(2+))和Ln(fod)_3(Ln=Pr~(3+),Yb~(3+),Eu~(3+))后的化学位移和偶合常数。结果表明,假接触和体积磁化率的变化是引起化学位移变化的主要原因,而Fermi接触的贡献可以忽略。
The effects of the addition of acacen (M = Cu 2+, Ni 2+) and Ln (fod) to Na_4Sn_9-ethylenediamine were investigated by ~ (199) Sn and ~ _3 (Ln = Pr ~ (3 +), Yb ~ (3 +), Eu ~ (3+)) after the chemical shifts and coupling constants. The results show that the change of the magnetic contact ratio and the volume susceptibility are the main causes of the chemical shift, while the contribution of the Fermi contact can be neglected.