as well as γxxxx(λ) and γyyyy(λ), are obviously larger than those perpendicular to the ring, i.e., αzz(λ) and γzzzz(λ). Moreover, the components of αiso(λ) and γ||(λ) in the long axis (i.e., x axis) of M + @C18 in with M + = Li + and Na + that deviate from the nine-fold symmetry are slightly higher than those in their short axis (i.e., y axis), while the two axial components of M + @C18 in with M + = K + , Rb + , and Cs + are almost equal. These observations are due to the fact that π electrons in C18 have a wider delocalization space parallel to the ring plane, and it is more prominent in the long axis direction.