A textbook of inorganic chemistry vol.X The metal-amines

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2H20 in negative mode. Table 5. 2H20. 5 541 m/e=mass, B=Base, Cyd-H deprotonated cytidine, Gly=glycerol. 5 100 The mass spectra of Mg2+ with the above ligands, were not reproducible. 2H20-3H]- (m=449), [Ba(Cyd)CI(Gly)-3H]- (m=505) and [Ba(Cyd)CI 2H20Gly-3H]- (m=541). All these fragments contain CI, which means that there is a direct Ba-Cl bond [16] under these conditions. The presence of CI- in the fragments has been confirmed also from the isotopic ratio 35/37 35Cl/37CI [22]. In the case of the calcium complex (Fig.

This result is in agreement with that which has been found in radiolysis of non deaerated aqueous solutions of deoxyguanosine-5'-monophosphate [18]. In this case the amount of the produced dGuo-C8-0R radicals reacted with oxygen in a diffusion control reaction (k=5x109 M-Is-I) and gave stable peroxyl radicals [19]. In addition, it was also found that the main oxidation product of the Fenton reaction with 2'-deoxyguanosine which involved perferryl ions or ferroxo complexes as the reactive species 8-hydroxy-2'- 26 1.

Russo et al. ), Properties and Chemistry of Biomolecular Systems, 37-47. © 1994 Kluwer Academic Publishers. 1. BARlYANGA ET AL. H,R' =-CH3) Uracile (R:HR'=HJ 10 H ~ , 5' yO HO-C-H 4"C 0 I HO-C-H 0 0H l' 2' OH OH OH SUGARS (S) OH 2-deoxyri bose ri bose (used in RNA) (used in DNA) Figure 1. Structures, Atom numbering and nomenclature of the nucleic acid bases and sugars. - C3 ' C2' - endo ---- .. Cl' CS' . -.. . cr ---+-~ C3' - endo Figure 2. The C2'-endo (B-DNA) and C3'-endo (A-DNA) conformations of sugar.

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