Abstract
Iron(II) complexes have been synthesized with 13-, 14-, 15-, and 16-membered, unsubstituted, fully saturated, tetradentate, macrocyclic ligands having nitrogen donor atoms. The complexes exhibit cis, trans, and dimeric six-coordinate geometries while displaying spin states which include low spin (S = 0), intermediate spin (S = 1), and high spin (S = 2). Moessbauer spectra and d-d electronic spectra have been obtained and correlated with structural features. Limited but significant series of compounds in both the high-spin and low-spin configuration show that ligand field strength increases dramatically as ring size decreases. Comparisons with earlier results on Me/sub 6/(14)aneN/sub 4/ indicate that the interactions of axial methyl groups weaken the metal-ligand interaction for both the axial ligands and the macrocycles. The effect of ring size on partial center shifts has been evaluated. (auth)
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