Naphthyl Amines as Novel Organoimido Ligands for Design of POM-Based Organic−Inorganic Hybrids: Synthesis, Structural Characterization, and Supramolecular Assembly of (Bu<sub>4</sub>N)<sub>2</sub>[Mo<sub>6</sub>O<sub>18</sub>N(Naph-1)]
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A novel naphthylimido derivative of hexamolybdate, (Bu4N)2[Mo6O18N(Naph-1)] (1), was synthesized for the first time by the reaction of octamolybdate ion and 1-naphthyl amine hydrochloride with DCC (N,N‘-dicyclohexylcarbodiimide) as a dehydrating agent. The ultraviolet−visible absorption spectrum shows the lowest energy electronic transition of 1 occurs at 383 nm, which is dramatically red-shifted compared to that of [Mo6O19]2- and other monosubstituted phenylimido hexamolybdates reported in the literature. Moreover, cyclic voltammetry studies on compound 1 show the reversible reduction wave at −0.53 V, which is cathodically shifted relative to that of [Mo6O19]2-. Another interesting characteristic of 1 is that the cluster anions form supramolecular 1D chains via C−H···O hydrogen bonding interactions.
