Twelve-, fourteen- and sixteen-membered macrocyclic ligands and a study of the effect of ring size on ligand field strength |
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Authors: | Chandra Sulekh Gupta Karuna |
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Affiliation: | (1) Department of Chemistry, Zakir Husain College, University of Delhi, Jawahar Lal Nehru Marg, New Delhi, 110002, India |
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Abstract: | Complexes of CrIII and NiII with a macrocyclic tetradendate 12-, 14- and 16-membered nitrogen donor ligand were prepared and characterized on the basis of elemental analysis, molar conductance, magnetic susceptibility measurements, i.r., electronic and e.p.r. spectra. The complexes are of the high-spin type. The effect of ring size on the Dq(xy) value is also discussed and the field strength was found to have a maximum value for the 14-membered ring, when metal ion fits best into the cavity rather than when the metal ion is compressed by the macrocycle. |
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