Interligand interactions affecting specific metal bonding to nucleic acid bases: X-ray crystal structure of tetrakis-µ-acetamidatobis(theophylline)rhodium(II)-rhodium(III) nitrate monohydrate

Abstract

X-Ray crystal structure analysis of tetrakis-µ-acetamidatobis(theophylline)rhodium(II)-rhodium(III) nitrate monohydrate, an adduct produced by oxidation with nitric acid, has shown that the dirhodium-tetra-acetamidato nucleus is occupied at the two axial positions by the N(7) site of the theophylline base; interligand hydrogen bond formation between the acetamidate nitrogen and the exocyclic oxygen O(6) of the base is an important factor favouring metal bonding to the N(7) site.