Seven-co-ordination in metal complexes of quinquedentate macrocyclic ligands. Part 6. Magnesium complexes of macrocyclic ligands containing nitrogen and oxygen donor atoms
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 5,p. 446-449
- https://doi.org/10.1039/dt9770000446
Abstract
Reaction of 2,6-diacetylpyridine or 2,6-diformylpyridine with 3,6-dioxaoctane-1,8-diamine in methanol in the presence of MgCl2·6H2O gves complexes [MgL(OH2)2]Cl2·H2O of 15-membered quinquedentate N2O2 macrocycles (L) in high yield. Simple metathetical reactions lead to derivatives containing other anions including neutral complexes having axially co-ordinated thiocyanate. On the basis of various physical properties, the complexes are assigned seven-co-ordinate, probably pentagonal-bipyramidal, structures. Control experiments show that in the absence of a salt of Mg2+ the macrocycles are formed in only small yield or not at all. The Ca2+ ion is ineffective in oromotina the synthesis of these macrocvcles, as is Mg2+ in the synthesis of three related quadridentate N4 and N3O macrocycles.Keywords
This publication has 0 references indexed in Scilit: