113Cd and 13C NMR spectra have been obtained on several dynamically stable cadmium complexes. In several cases a 13C-113Cd three-bond coupling has been observed and utilized in the assignment of the 13C NMR spectra. The pH dependence of the 113Cd resonance from the cadmium-ethylenediamine-N,N,N′,N′-tetraphosphonate complex shows that this complex has two acid dissociation constants, pKa= 7.85 and 8.80, respectively. 113Cd nuclear Overhauser effect, NOE, =1 + η, and spin lattice relaxation time, T1, were determined on all the complexes and used in the analysis of the contribution to the relaxation mechanism from the dipolar interaction with protons and chemical shift anisotropy. Together, the multinuclear NMR parameters contribute to a detailed understanding of the structure and dynamics of these metal complexes. Furthermore, the 113Cd NMR parameters from these model complexes provide important new data relevant to the interpretation of the 113Cd NMR parameters from biological systems.