Abstract
The proton chemical shifts of2-hydroxy-1, 3-propanediamine-N, N, N′, N′ -tetraacetic acid and 1, 3- propanediamine-N,N,N′,N′-tetraacetic acid in 1:1 complexes with diamagnetic metal ions have been investigated as a function o f the metal ion charge Z and crystal ionic radius r. The chemical shifts correlate with Z/r linearly but separately in (II)A, (II)B, and lanthanide group. The inductive effects, long-range shielding and solvent ordering effects of metal ions are discussed as the posibble contributions to the proton chemical shifts.
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