Summary
Divalent nickel, cobalt and copper salts react with 2,6-diaminopyridine and acetylacetone to form complexes containing a 16-membered N6 tetradentate macrocyclic ligand. The complexes are characterised as distorted octahedra of the M(TML)X2 type where M=nickel(II), cobalt(II) and copper(II); TML=tetradentate macrocyclic ligand and X=Cl, Br, NO3 or NCS. The ligand coordinates through all the four azomethine nitrogen atoms which are bridged by acetylacetone moieties. Pyridine nitrogen does not participate in coordination, a fact supported by far i.r. studies. The magnetic, electronic and i.r. spectral studies indicate that the complexes have lower symmetries and the amounts of distortion calculated in terms of DT/DQ applying normalised spherical harmonic Hamiltonian theory indicate that these complexes are moderately distored.
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Rana, V.B., Singh, D.P., Singh, P. et al. Divalent nickel, cobalt and copper complexes of a tetradentate N6 macrocyclic ligand. Transition Met Chem 6, 36–39 (1981). https://doi.org/10.1007/BF01143465
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DOI: https://doi.org/10.1007/BF01143465