Herein we report the synthesis of a series of iron-functionalized, mixed-valent, polyoxovanadate alkoxide clusters, [V5O6(OCH3)12Fe]X (X = Cl, Br, SO3CF3) comprised of a hexanuclear Lindqvist (M6O19(n-)) core. By substituting a V═O moiety from the well-defined hexavanadate clusters [V(IV)nV(V)6-nO7(OR)12](4-n) (R = Me, Et) with a metal cation, we have developed a novel template for investigation of the organometallic properties of these systems. Characterization of the clusters was performed by (1)H NMR, Fourier transform infrared, and electron absorption spectroscopies and electrospray ionization mass spectrometry. The IR and UV-vis spectra suggest substantial electronic delocalization, similar to the previously reported cluster, V6O7(OCH3)12.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1021/acs.inorgchem.6b01349 | DOI Listing |
Chem Commun (Camb)
May 2024
Department of Chemistry, University of Rochester, Rochester NY 14627, USA.
We report the transfer of H-atoms from a reduced polyoxovanadate alkoxide [OctN][VO(OH)(OMe)] concerted proton-electron transfer. Oxygen reduction is compared between bridging and terminal O-H bonds revealing similar mechanisms, providing new insight to design criteria for metal-oxide electrocatalysts that faciliate oxygen reduction by concerted-proton electron transfer.
View Article and Find Full Text PDFInorg Chem
April 2024
Department of Chemistry, University of Rochester, Rochester, New York 14627, United States.
An understanding of how molecular structure influences the thermodynamics of H atom transfer is critical to designing efficient catalysts for reductive chemistries. Herein, we report experimental and theoretical investigations summarizing structure-function relationships of polyoxovanadate-alkoxides that influence bond dissociation free energies of hydroxide ligands located at the surface of the cluster. We evaluate the thermochemical descriptors of O-H bond strength for a series of clusters, namely [VO(OH)(TRIOL)] ( = 2, 4, 6; R = NO, Me) and [VO(OMe)(OH)(TRIOL)], via computational analysis and open circuit potential measurements.
View Article and Find Full Text PDFJ Am Chem Soc
January 2024
Department of Chemistry, University of Rochester, Rochester, New York 14627, United States.
The transfer of two H-atom equivalents to the titanium-doped polyoxovanadate-alkoxide, [TiVO(OCH)], results in the formation of a V(III)-OH site at the surface of the assembly. Incorporation of the group (IV) metal ion results in a weakening of the O-H bonds of [TiVO(OH)(OCH)] in comparison to its homometallic congener, [VO(OH)(OCH)], resembling more closely the thermodynamics reported for the one-electron reduced derivative, [VO(OH)(OCH)]. An analysis of early time points of the reaction of [TiVO(OCH)] and 5,10-dihydrophenazine reveals the formation of an oxidized substrate, suggesting that proton-coupled electron transfer proceeds via initial electron transfer from substrate to cluster prior to proton transfer.
View Article and Find Full Text PDFDalton Trans
December 2023
Department of Chemistry, University of Rochester, Rochester, NY 14627, USA.
Non-aqueous redox flow batteries constitute a promising solution for grid-scale energy storage due to the ability to achieve larger cell voltages than can be readily accessed in water. However, their widespread application is limited by low solubility of the electroactive species in organic solvents. In this work, we demonstrate that organic functionalization of titanium-substituted polyoxovanadate-alkoxide clusters increases the solubility of these assemblies over that of their homoleptic congeners by a factor of >10 in acetonitrile.
View Article and Find Full Text PDFNano Lett
November 2023
Department of Chemistry, University of Rochester, Rochester, New York 14627, United States.
A limitation of the implementation of cadmium chalcogenide quantum dots (QDs) in charge transfer systems is the efficient removal of photogenerated holes. Rapid hole transfer has typically required the functionalization of hole acceptors with groups that can coordinate to the surface of the QD. In addition to being synthetically limiting, this strategy also necessitates a competitive binding equilibrium between the hole acceptor and native, solubilizing ligands on the nanocrystal.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!