A Novel Series of Materials Composed of Arrays of Vanadium Oxide Container Molecules, {V18O42(X)} (X = H2O, Cl-, Br-):  Synthesis and Characterization of [M2(H2N(CH2)2NH2)5][{M(H2N(CH2)2NH2)2}2V18O42(X)]· 9H2O (M = Zn, Cd)
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