Related Experiment Video
Updated: Sep 5, 2025

Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
Published on: September 5, 2018
Organically Functionalized Mixed-Valent Polyoxo-30-molybdate Wheel and Neutral Tetramolybdenum(V) Oxo Cluster
Anusree Sundar1, Saurav Bhattacharya1, Juliane Oberstein1
1Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, Bremen 28759, Germany.
Abstract:
The first organofunctionalized mixed-valent polyoxo-30-molybdate wheel, [MoVI18MoV12O84{AsO2(CH3)2}18]18- (Mo), was synthesized in aqueous, mildly acidic conditions, and upon further acidification, the neutral tetramolybdenum(V) oxo cluster [MoV4O8{AsO2(CH3)2}4] (Mo) was obtained. Single-crystal X-ray diffraction (XRD) revealed that Mo comprises 18 MoVI and 12 MoV ions arranged in a cyclic fashion with alternating {MoV2} and {MoVI3} groups, which are capped by 18 dimethylarsinate ligands, resulting in a novel polyoxo-30-molybdate wheel with a central cavity of ∼1.5 nm. On the other hand, Mo has a distorted-cubic structure, with the corners of the cube being occupied by alternating MoV ions and oxo ligands. The compounds were characterized in solution by 1H and 13C NMR and UV-vis spectroscopy and in the solid state by X-ray photoelectron spectroscopy and powder XRD. Mo represents a novel type of polyanionic cycle with manyfold possibilities regarding host-guest chemistry.
Related Concept Videos
Properties of Organometallic Compounds
Valence Bond Theory
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...
Complexometric Titration: Ligands
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Cycloaddition Reactions: MO Requirements for Thermal Activation

