Synthesis, Characterization, and Crystal Structure of a Vanadium(V)-Vanadium(IV)-Vanadium(V) Mixed-Valence Trinuclear Complex with a Tridentate Quinato Ligand, (NH4)2{[VV(O)2]2[VIV(O)](.mu.-(-)-quinato(3-))2}.cntdot.H2O
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