Related Experiment Video
Updated: May 2, 2026
Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
Published on: November 9, 2019
Influence of a "Dangling" Co(II) Ion Bound to a [MnCo3O4] Oxo Cubane
Andy I Nguyen1, Lucy E Darago1, David Balcells2
1Department of Chemistry , University of California at Berkeley , Berkeley , California 94720-1460 , United States.
Abstract:
Cobalt(II), in the presence of acetate and nitrate, quantitatively adds to the manganese-cobalt oxido cubane MnIVCoIII3O4(OAc)5(py)3 (1) to furnish the pentametallic dangler complex MnIVCoIII3CoIIO4(OAc)6(NO3)(py)3 (2). Complex 2 is structurally reminiscent of photosystem II's oxygen-evolving center, and is a rare example of a transition-metal "dangler" complex. Superconducting quantum interference device magnetometry and density functional theory calculations characterize 2 as having an S = 0 ground state arising from antiferromagnetic coupling between the CoII and MnIV ions. At higher temperatures, an uncoupled state dominates. The voltammogram of 2 has four electrochemical events, two more than that of its parent cubane 1, suggesting that addition of the dangler increases available redox states. Structural, electrochemical, and magnetic comparisons of complexes 1 and 2 allow a better understanding of the dangler's influence on a cubane.
Related Concept Videos
01:29Covalent Bonds
02:48Bond Polarity, Dipole Moment, and Percent Ionic Character
02:54Lewis Structures of Molecular Compounds and Polyatomic Ions
02:34Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
01:19Diazonium Group Substitution: –OH and –H
01:08Covalent Bonds
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...