Phthalocyanines polydentate

Zinc complexes of at number of bulky polydentate ligands (36) which are structurally related to phthalocyanines have been reported by Gagne.350... 

There have been extensive studies of V complexes of polydentate N- and N,0-donor hgands. These include porphyrins and phthalocyanins. X-ray structures have recently been obtained as exemphfied in (5). ... 

Square coplanar bonds are formed only in complexes with certain polydentate ligands or combinations of ligands such that steric factors prevent a tetrahedral configuration. They include the phthalocyanine (low-spin), the bis-salicylaldehyde diimine complex (a) (in which the maximum deviation of any atom from the mean plane of the complex is 0 6 A and Co-O(N) is 1-85 A), and the ion (b) in the salt [Co(mnt)2] [N(C4H9)4] 2. The magnetic moment of this salt (3-92 BM) corresponds to 3 unpaired electrons (d" ). The Ni((ii) compound is isostructural. Ions [M(mnt)2] are formed by Ni(m) and Cu(iii). The similar ion formed by... 

Isolation of a cobalt phthalocyanine catalyst known to be active in autooxidation and to be deactivated by dimerization has been reported by Schutten (36). In this case, a polyvinylamine poly-dentate ligand was added to a dilute aqueous solution of the cobalt(II) phthalocyanine tetra(sodium sulfonate) in order to prepare a thiol oxidation catalyst. By employing dilute solutions, the polydentate polyamine polymer in effect isolated the cobalt(II) catalyst within an individual polyamine coil minimizing dimerization and significantly increasing catalyst activity. 

---