Title

Five- and Six-coordinated Cobalt(II), Nickel(II), Copper(II), and Zinc(II) Complexes of the Pentadentate Schiff Base Ligands N,N′-bis[(2-hydroxy-5-Y-phenyl)phenylmethylene]-4-azaheptane-1,7-diamine (Y = Chloro Or Methyl) and N,N′-bis[(5-chloro-2-hydroxyphenyl)phenylmethylene]-4-thiaheptane-1,7- Diamine

Abstract

Zinc(II), copper(II), nickel(II), and cobalt(II) complexes of the potentially pentadentate ligands H2cbpN, H2mbpN, and H2cbpS and some Lewis base adducts (with pyridine (py) and 2-, 3-, and 4-methylpyridine (2-Mepy, 3-Mepy, 4-Mepy)) have been isolated and their spectral and magnetic properties investigated. The ligands are formed from the Schiff base condensation of 2-hydroxy-5-Y-benzophenone (Y = chloro, methyl) with 4-azaheptane-1,7-diamine (H2cbpN and H2mbpN) and 5-chloro-2-hydroxybenzophenone with 4-thiaheptane-1,7-diamine (H2cbpS). These data indicate that the complexes ML (L = cbpN, mbpN, cbpS) are all five-coordinate. Previous x-ray structural data had shown that Ni(mbpN), Cu(mbpN), Zn(mbpN)·H2O, and Zn(cbpN)·H2O were five-coordinate. Spectral data indicate that the adducts with heterocyclic Lewis bases, ML·base (M = Co(II), Ni(II)), are octahedral with the Schiff base ligands acting as pentadentates. The postulated structures of the cbpX complexes differ unexpectedly from those previously postulated for the analogous salicylaldimines.

Department(s)

Chemistry

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1977 American Chemical Society (ACS), All rights reserved.


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