Adducts of guanine with chromium(III), iron(III) and oxovanadium(IV) chlorides |
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Authors: | Chester M Mikulski Linda Mattucci Lynne Weiss Nicholas M Karayannis |
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Institution: | Department of Chemistry and Physics, Beaver College, Glenside, Pa. 19038, U.S.A.;Amoco Chemicals Corporation, P.O. Box 400, Naperville, Ill. 60566, U.S.A. |
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Abstract: | The preparation of well-defined adducts of the M(guH)(2Cl3 (M = Cr, Fe) and VO(guH)Cl2 types (guH = neutral guanine), by refluxing ligand and metal chloride mixtures in ethanol-triethyl orthoformate, is reported. Characterization studies suggest that the new complexes are probably linear chain-like polymeric species, involving single bridges of bidentate guH ligands between adjacent metal ions. Bidentate bridging guH is most probably coordinated through the N(7) and N(9) imidazole nitrogens. The chloro ligands present in the adducts are exclusively terminal. Infrared evidence rules out the possibility of coordination of guanine through either of its exocyclic potential binding sites (i.e., CO oxygen and NH2 nitrogen) 1]. |
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