Complexes of binucleating ligands. II. Geometrical models for potential nitrogen fixing systems

The synthesis and some properties of a series of complexes, LCu2(X), are discussed where L is the binucleating trianion derived from d-methylisophthal-aldehyde di-2'-hydroxyanil [2-hydroxy-5-methyl-1,3-xylene-¿,¿'-diylidenebis(2-hydroxyphenylamine)] and X- is OH-, OR- ; pyrazolate anion; binuclear structures are assigned to these compounds on the basis of spectral and magnetic evidence. In the compound formulated as (L,H2O)Cu2(OCH3) it is suggested that the water molecule is added across one Schiff base link in L. The possible relevance of the results to a long-term project concerned with the synthesis of potential nitrogen-fixing systems is briefly discussed.