Abstract
The integral perturbed angular correlation (IPAC) technique has been used to determine the stability constant of the Hf—EDTA complex in 4.6 M HClO 4. The stability constant (log K) was found to be: 30.1±0.44. The time differential perturbed angular correlation (TDPAC) study of polycrystalline Hf—EDTA was carried out to estimate the quadrupole interaction frequency ( w Q) and the asymmetry of the EFG for the complex, before and after heating at 160°C. These parameters are very similar in these two cases and indicate the possibility of partial polymerization through OH bridging, whereby the immediate chemical surrounding of the hafnium nucleus is expected to remain unchanged.
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