Polynuclear CuII12MIII6 (M = Y, Nd, or Gd) Complexes Encapsulating a ClO4- Anion: [Cu12M6(OH)24(H2O)18(pyb)12(ClO4)](ClO4)17.cntdot.nH2O (Pyb = Pyridine Betaine)

Abstract
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