Potassium Bis nitrilotriacetato zirconate IV

Submitted by E. M. LARSEN and A. C. ADAMS Checked by JOHN P. FACKLER, JR.t 

The bis (nitrilotriacetato) zirconium (IV) ion, first detected by Intorre and Martell, has been obtained as a hydrated potassium salt by evaporation of a solution containing zirconium oxychloride and the potassium salt of nitrilotriacetic acid. On vacuum dehydration, the anhydrous complex is formed. 

This preparation gives the potassium bis(nitrilotriacetato)-zirconate(IV) as very small irregular crystals. However, if the solution is evaporated slowly during the recrystallization, large diamond-shaped crystals are formed. In the rubidium and the potassium salts, the two nitrilotriacetate ligands are coordinated to the zirconium in a slightly distorted dodecahedral arrangement. 

Submitted by A. DAVlSONf and R H. HOLM Checked by R. E. BENSON and W. MAHLER  

Since the initial preparations of several four- and six-coordinate complexes of the general formulations [MS4C4R4] and 

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