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3295of the rather specific requirements for halide binding both within and between the clusters. For this reason ternary systems have also been under investigation, leading to the discovery of C S N~~I~~~~~ the present CsZr6114 as sort of an intercalate of a known structure type, and, recently, the analogous NaNb6Cl15 with the Nb6CllS structure and a new structure type for CsNb6C11s.30 Obviously the use of a higher-valent second metal, especially with the electron-poorer clusters, seems attractive, for example, with MZr6114, where M = Ba would give a cluster isoelectronic with Zr6112.(30) Imoto, H.; Simon, A., private communication, 1981. Doubtlessly, less obvious derivatives will be found as well.Acknowledgment. The authors are indebted to R. A. Jacobson for continued crystallographic advice, to R. G. Barnes and D. T. Torgeson for assistance in ESR measurements, and to D. M. P. Mingos and P. Minshall for assistance in the computation, time for which was provided by the

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Aqueous solutions of the industrially important metal chelate ferric N-(2-hydroxyethyl)ethylenediamine-N,N′,N′triacetate (FeHEDTA) have been made by adsorbing an iron salt (nitrate or sulfate) on Dowex MSC-1 cationexchange resin (Na form), flushing out the sodium salt, and eluting with Na 3 HEDTA. The resulting eluate contained FeHEDTA with iron concentrations approaching 2% that were free from sodium salts. Achieving industrially useful iron concentrations (>4.5%) required countercurrent ion exchange using an ISEP system. Careful manipulation of pH was required to prevent plugging due to precipitated iron oxide/hydroxide.