Publication

Isomerization mechanisms of a labile Co(II) octahedral complex

André Merbach, Lothar Helm, Fabrice Riblet
2006
Journal Articles

Abstract

The labile cobalt (II) complex [Co(TUF)2(Pic)2] with 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (TUF) bidentate and 4-methylpyridine (Pic) monodentate ligands was studied by variable temp. (VT) 19F NMR from 184 to 312 K. In contrast to the solid state, all the isomers are present in a CD2Cl2 soln. Thermodn. parameters (DHo and DSo) of each isomer with ref. to the trans(N)-trans(CF3)-trans isomer were obtained from the fitting of exptl. mole fraction values. A kinetics investigation of the isomerization processes was performed by lineshape anal. of the spectra using the Kubo-Sack formalism. The suggested bidentate bondrupture mechanism involves the breaking of the weakest Co-O bond (closest to the CF3 withdrawing group) with the TUF ligand.

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André Merbach, Lothar Helm, Fabrice Riblet
2006
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f2ec9a39-f3c3-41d5-b66f-483c79ec3122

About this result

Related concepts (24)

Ligand

In coordination chemistry, a ligand is an ion or molecule with a functional group that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's electron pairs, often through Lewis bases. The nature of metal–ligand bonding can range from covalent to ionic. Furthermore, the metal–ligand bond order can range from one to three. Ligands are viewed as Lewis bases, although rare cases are known to involve Lewis acidic "ligands".

Denticity

In coordination chemistry, denticity () refers to the number of donor groups in a given ligand that bind to the central metal atom in a coordination complex. In many cases, only one atom in the ligand binds to the metal, so the denticity equals one, and the ligand is said to be monodentate (sometimes called unidentate). Ligands with more than one bonded atom are called polydentate or multidentate. The denticity of a ligand is described with the Greek letter κ ('kappa').

Octahedral molecular geometry

In chemistry, octahedral molecular geometry, also called square bipyramidal, describes the shape of compounds with six atoms or groups of atoms or ligands symmetrically arranged around a central atom, defining the vertices of an octahedron. The octahedron has eight faces, hence the prefix octa. The octahedron is one of the Platonic solids, although octahedral molecules typically have an atom in their centre and no bonds between the ligand atoms. A perfect octahedron belongs to the point group Oh.

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