Assembly of Organic–Inorganic Hybrids From 1D to 2D Framework Based on Triethanolamine-Functionalized Molybdovanadate with Electrochemical Sensing of Ascorbic Acid

Two new organic–inorganic hybrids, (TeaH)2[Cu(Tea)(H2O)2]2[Cu(Tea)]2[HN(CH2CH2O)3VMo6O22]2·12H2O (1), (NH4)5[Na(H2O)2][Cu(Tea)]2[HN(CH2CH2O)3VMo6O22]2·13H2O (2) [Tea = triethanolamine], has been synthesized and structurally characterized. A hybrid subunit [HN(CH2CH2O)3VMo6O22]5− was synthesized in aqueous solution, in which Tea ligand is linked covalently with the [VMo6O25]9− cluster. In compound 1, the {[Cu(Tea)]2[HN(CH2CH2O)3VMo6O22]2}6− anions, [Cu(Tea)(H2O)2] units and protonated [TeaH]+ cations are joined together via hydrogen bond interactions to form a two-dimensional (2D) layered framework. Compound 2 adopts a 1D chain structure, in which the adjacent {[Cu(Tea)]2[HN(CH2CH2O)3VMo6O22]2}6− anions are connected alternately by [Na(H2O)2]+ units. Compounds 1 and 2 modified electrodes exhibit good electrochemical sensing performance for the detection of ascorbic acid. Two new organic-inorganic hybrids from 1D to 2D framework based on triethanolamine functionalized molybdovanadate have been synthesized and structurally characterized. The functional application of 1 and 2 in electrochemical sensing of AA are investigated in detail.