Putting a New Spin on Supramolecular Metallacycles: Co<sub>3</sub> Triangle and Co<sub>4</sub> Square Bearing Tetrazine-Based Radicals as Bridges
作者:Dimitris I. Alexandropoulos、Brian S. Dolinar、Kuduva R. Vignesh、Kim R. Dunbar
DOI:10.1021/jacs.7b06925
日期:2017.8.16
The synthesis of two new radical-bridged compounds [Co3(bptz)3(dbm)3]·2toluene (1) and [Co4(bptz)4(dbm)4]·4MeCN (2) (bptz = 3,6-bis(pyridyl)-1,2,4,5-tetrazine; dbm = 1,3-diphenyl-1,3-propanedionate) is reported. The presence of the ligand-centered radical has been confirmed by X-ray crystallography and SQUID magnetometry. These complexes are the first metallacycles bearing nitrogen heterocyclic radicals
Directed Supramolecular Assembly of Infinite 1-D M(II)-Containing Chains (M = Cu, Co, Ni) Using Structurally Bifunctional Ligands
作者:Christer B. Aakeröy、Nate Schultheiss、John Desper
DOI:10.1021/ic048405y
日期:2005.7.1
The directed assembly of six different M(II) complexes (M = Cu, Co, and Ni) into infinite chains has been achieved by combining anionic chelating ligands (for controlling the coordination geometry) with bifunctional ligands containing a metal-coordinating pyridyl moiety and a self-complementary hydrogen-bonding moiety. Six crystal structures are presented, and in each case, the chelating acac ligand occupies the four equatorial coordination sites leaving room for the bifunctional ligand to coordinate in the axial positions. The supramolecular chemistry, which organizes the coordination complexes into the desired infinite 1-D chains, is driven by a combination of N-H center dot center dot center dot N and N-H center dot center dot center dot O hydrogen bonds.
Dimerization of ethylene catalyzed by β-diketonate complexes of cobalt and nickel