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Materials 2018, 11(1), 15; https://doi.org/10.3390/ma11010015

Analogies between Vanadoborates and Planar Aromatic Hydrocarbons: A High-Spin Analogue of Aromaticity

Department of Chemistry, University of Georgia, Athens, GA 30602, USA
Received: 8 December 2017 / Revised: 19 December 2017 / Accepted: 22 December 2017 / Published: 23 December 2017
(This article belongs to the Special Issue Polyoxometalate and Nanohybrid Materials)
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Abstract

The vanadium-vanadium interactions in the polygonal aggregates of d1 vanadium(IV) atoms, with a total of 4k + 2 vanadium electrons (k an integer) imbedded in an electronically inactive borate matrix in certain vanadoborate structures are analogous to the ring carbon-carbon interactions in diamagnetic planar cyclic hydrocarbons. They thus represent a high-spin analogue of aromaticity. Thus, the vanadoborate anion [V6B20O50H8]8− with six V(IV) electrons (i.e., 4k + 2 for k = 1) contains a macrohexagon of d1 V(IV) atoms with four unpaired electrons. This high-spin system is related to the low-spin aromaticity in the diamagnetic benzene having six π electrons. Similarly, the vanadoborate anion [V10B28O74H8]16− with ten V(IV) electrons (i.e., 4k + 2 for k = 2) contains a macrodecagon of d1 V(IV) atoms with eight unpaired electrons. Again, this high-spin system is related to the aromaticity in the diamagnetic 1,6-methanol[10]annulene, having ten π electrons. View Full-Text
Keywords: vanadium; boron; vanadoborates; planar aromatic hydrocarbons; aromaticity vanadium; boron; vanadoborates; planar aromatic hydrocarbons; aromaticity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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King, R.B. Analogies between Vanadoborates and Planar Aromatic Hydrocarbons: A High-Spin Analogue of Aromaticity. Materials 2018, 11, 15.

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