Related Experiment Video
Updated: Apr 30, 2026

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
Multiple-Bonding and Lability: Study of an Anionic Vanadium Alumanyl
Pavel Zatsepin1, Chaoqi Chen2,3, Takumi Moriyama2
1Department of Chemistry, School of Science, Institute of Science Tokyo, Meguro-ku, Tokyo, Japan.
Abstract:
An anionic vanadium alumanyl complex is prepared by a reaction of neutral vanadocene and an alumanyl anion. Single-crystal XRD revealed a significantly contracted V-Al bond relative to that of the neutral congener. Theoretical calculations using IBO and QTAIM analysis attributed this contraction to enhanced multiple-bonding character based on the d-p π-backdonation from V to Al. Magnetic data confirms the S = 1/2 spin state of this anion, with EPR spectroscopy displaying relatively strong coupling between the V-centered unpaired electron and the 27Al nucleus. Furthermore, V K-edge XANES and XPS data revealed the oxidation states of the V and Al centers, highlighting the reduced nature of both metal centers. Reactivity studies revealed the dissociation of the anionic alumanyl ligand from the V center even in the presence of the multiple V─Al bond character, in stark contrast to the reactivity of the neutral analogue, as supported by a DFT-based mechanistic study.
Related Concept Videos
Valence Bond Theory
Valence Bond Theory
Complexation Equilibria: Factors Influencing Stability of Complexes
Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Complexation Equilibria: The Chelate Effect
Bonding in Metals

