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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'). For example, κ6-EDTA describes an EDTA ligand that coordinates through 6 non-contiguous atoms. Denticity is different from hapticity because hapticity refers exclusively to ligands where the coordinating atoms are contiguous. In these cases the η ('eta') notation is used. Bridging ligands use the μ ('mu') notation. Classes Polydentate ligands are chelating agents and classified by their denticity. Some atoms cannot form the maximum possible number of bonds a ligand could make. In that case one or mor

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Isomerization mechanisms of a labile Co(II) octahedral complex

Lothar Helm, André Merbach, Fabrice Riblet

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.

2006

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