Synthetic, structural and spectroscopic studies on mono- and bi-arylimido functionalized hexamolybdates bearing the strong electron-withdrawing nitro group, (Bu_4N)_2[Mo_6O_(18)(≡NAr)] and (Bu_4N)_2[Mo_6O_(17)(≡NAr) _2] (Ar=o-NO_2-C_6H_4)

摘要

Two novel mono- and bi-functionalized organoimido derivatives of hexamolybdates bearing the strong electron-withdrawing nitro group, (Bu _4N)_2[Mo_6O_(17)(NAr)_2] (1) and (Bu_4N)_2[Mo_6O_(18)(NAr)] (2) (Aro-NO_2-C_6H_4) have been synthesized for the first time via the reaction of hexamolybdate ions and 2 equivalent of aromatic amines with an excessive dehydrating agent N,N′-dicyclohexylcarbodiimide (DCC). By controlling the amount of DCC, such two derivatives can be selectively prepared in reasonable yields, which have been characterized with UV/vis, IR, ~1H NMR, ESI-mass spectrometry and single-crystal X-ray diffraction techniques. The influences of [NAr] ligands and [NAr] incorporation number on properties and supermolecular assembly of such two derivatives have been systematically investigated.