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    Chapter and Conference Paper

    Color and Variable Valence in Niobium and Tantalum Halides

    The very stable polynuclear halide ions [M6X12]2+ (M = Nb or Ta, X = Cl or Br) are unique in that though the X-ray structure analyses of the complex (Fig. 1) demonstrate that the metal ions are all in equivalent ...

    M. B. Robin, N. A. Kuebler in Proceedings of the 8th International Confe… (1964)