摘要

A new nanosized polyoxometalate modified by benzylarsonate ligands, [(C7H7AsO3)(6)W12O36](12-) (1a), was successfully isolated and structurally characterized as Na-2(C2H8N)(4)H-6[(C7H7AsO3)(6)W12O36].30H(2)O (1). Controlled protonation of 1a led it to self-reorganize into isomer cage cluster [(C7H7AsO3)(6)W12O30(OH)(4)(H2O)(2)](4-) (2a) with an organic ligand arranging in "half-open" mode. The reversibly switchable cage transform was monitored by H-1 NMR. Also, the origin of the solid supramolecular chirality in the crystal 1 and the aggregation process of 1a were preliminarily studied.