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Non-Traditional Coordination in the Complexes of 2-[2¿-hydroxy(2¿-Ntosylamino) phenyl] and 2-[2¿-hydroxyazomethine)]-1-alkylbenzimidazoles

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Author(s): Blanco , L.M. | Burlov , A.S. | Garnovskii , A.D. | Garnovskii , D.A. | Kharisov , Boris I. | Kuznetsova , L.I. | Volbushko , N.V.

Journal: Revista de la Sociedad Química de México
ISSN 0583-7693

Volume: 43;
Issue: 5;
Start page: 143;
Date: 1999;
Original page

Keywords: Non-traditional coordination | adducts | transition metal complexes.

ABSTRACT
In this paper the formation of molecular complexes (adducts) on the basis of benzimidazole derivatives is reported. The way of localization of the coordination bond in the synthesized compounds is also suggested. The synthesis of the adducts (LH)m · MCln (m = 1, 2; n = 2, 4) is carried out by the interaction of typical chelating ligands 2- hydroxy-(N-tosylamino)phenylbenzazoles or hydroxyazomethines of 1- alkyl-2-aminobenzimidazole (LH) with copper, zinc, palladium, tin and titanium chlorides (MCln). The IR, UV and luminescence studies show that non-traditional coordinations of the ligands take place in the synthesized complexes. It is suggested that the ligands exist in the complexes, probably, in the quinonoid tautomeric form, connected to the metal atom through the nitrogen atom of pyridinic type and/or oxygen atom of phenolic fragment of the ligand systems. It is concluded that, in addition to well-known standard metal chelates, the adducts with completely conserved ligand system (LH) could be also formed on the basis of the typical chelating ligands above mentioned.
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