Please login first

Methanolysis of 2-cyanopyridine in the coordination sphere of manganese(II). The structure of Mn4L6Cl2 cluster (L = methyl picolinimidate)
Lara Rouco 1 , Rosa Pedrido 2 , M. Isabel Fernández-García 1 , Ana Mª González-Noya 2 , Marcelino Maneiro * 1
1  Departamento de Química Inorgánica, Facultade de Ciencias, Universidade de Santiago de Compostela
2  Departamento de Química Inorgánica, Facultade de Química, Universidade de Santiago de Compostela


Increased reactivities of molecules coordinated in metal complexes have wide applications in chemistry. The activation of ligands containing the nitrile group upon their coordination to a manganese ion has been exploited in addition reactions of nucleophiles such as amines, alcohols and water. The 2-cyanopyridine as a chelating bidentate ligand can be coordinated to manganese ion from two nitrogen atoms of pyridine ring and carbonitrile group in the presence of non-protonic solvents. The reaction of 2-cyanopyridine and Mn(II) in methanol solution led to the formation of a Mn4L6Cl2 cluster 1 containing O-methyl picolimidate as a ligand (L). The coordination of 2-cyanopyridine to the Mn(II) ion as a chelating bidentate ligand activated the CN triple bond which subsequently suffered a nucleophilic attack by CH3OH. Complex 1 was characterized by standard techniques including microanalysis, IR spectroscopy, ESI spectrometry, and magnetic susceptibility measurements. The crystal structure of 1 was determined by X-ray diffraction techniques, and the crystallographic studies revealed a planar-diamond array for 1 where the six monoanionic picolinimidates act as chelating ligands through the two nitrogen atoms.

Keywords: manganese; methanolysis; X-ray diffraction; supramolecular chemistry