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Updated: Nov 10, 2025

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Isolation of the Elusive Heptavanadate Anion with Trisalkoxide Ligands
Leticia Fernández-Navarro, Aitor Nunes-Collado, Beñat Artetxe
1Departamento de Ciencias and Institute for Advanced Materials and Mathematics (InaMat2), Universidad Pública de Navarra (UPNA), Campus de Arrosadia, 31006 Pamplona, Spain.
Abstract:
The unprecedented heptavanadate cluster has been isolated from reactions between trisalkoxide ligands and vanadate in water at pH = 2 as a series of alkylammonium [HV7O18(H2O)((OCH2)3CR)](4-x)- salts (1-3, R = CH2OH; 4, R = CH3). Their structures have been determined and the partial stability of 4 in water assessed by a combination of multinuclear NMR spectroscopy and ESI-MS. The heptavanadate unit reported herein could represent an intermediate species in the formation of decavanadate that is blocked by attachment of tripodal ligands.
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