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Halide encapsulation by dicarboxylate oxido-vanadium cage complexes


Compounds [Bu4N]2[V8O16(oda)4⊂2Cl], 1, [Bu4N]2[V8O16(glut)4⊂2Cl], 2, and [Bu4N][V4O8(glut)2⊂F], 3, (oda = oxydiacetate, O(CH2COO)22-; glut = glutarate, CH2(CH2COO)22-) were obtained by a stepwise reaction of in-situ prepared [Bu4N]VO3 with HCl (or HF for 3) and then with the dicarboxylic acid X(CH2COOH)2 (X = O and CH2), under appropriate reaction conditions. Multinuclear magnetic resonance (1H, 13C{1H}, 35Cl, 19F and 51V), electrochemical studies, X-ray structural determinations (single crystal and powder), thermogravimetric analyses (TGA) and Density Functional Theory (DFT) calculations were employed to characterise these polyoxovanadate complexes 1-3. They included encapsulated halide anions, two chloride ions in 1 and 2 and one fluoride ion in 3, where the shape and dimensions of the cage were governed by the halide size. The stabilizing template effect of the chloride ion towards the bowl-shaped [V4O8(OOCR)4] fragment (i.e. the half part of 1 and 2), containing a crown shaped {V4O8} subunit, or that of the fluoride ion towards the planar {V4O8} moiety in 3 was definitively demonstrated by DFT calculations. The HOMO composition of 1 prompted us to study the possible oxidation of the two encapsulated chloride ions toward a chlorine molecule. The electrochemical behaviors of 1-3 were thus investigated. However, the chlorine molecule in the model [V8O16(oda)4⊂(Cl2)], 6c, was not capable to stabilise the polyoxovanadate cage [V8O16(oda)4], 4c, according to DFT calculations.

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Publication details

The article was received on 10 Nov 2017, accepted on 02 Jan 2018 and first published on 09 Jan 2018

Article type: Paper
DOI: 10.1039/C7DT04251E
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Halide encapsulation by dicarboxylate oxido-vanadium cage complexes

    M. Gómez, A. Pastor, E. Alvarez González, J. L. Olloqui-Sariego and A. Galindo, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C7DT04251E

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