Selectivity of tetra-aza macrocycles towards metal spin states. The high-spin–low-spin equilibrium for nickel(II) complexes with 13- and 14-membered ligands
- 1 January 1979
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 12,p. 1857-1861
- https://doi.org/10.1039/dt9790001857
Abstract
Nickel(II) complexes with 13- and 14-membered tetra-aza macrocycles exist in aqueous solution as an equilibrium mixture of a blue high-spin and a yellow low-spin species: the blue-to-yellow conversion is endothermic and predominance of the yellow form stems from a large positive entropy term, due to the release of two or more water molecules. The energy of the in-plane Ni–N interactions for low-spin complexes with 12- to 15-membered macrocycles is related to the size of the aperture in the cyclic ligand.Keywords
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