Proton chemical shift values Sample Clauses

Proton chemical shift values. (ppm) for the complex [{Ru(apy)(tpy)}2{µ-H2N(CH2)6NH2}](ClO4)4 (1g) taken in DMSO-d6 at 298 K. The proton labels are indicated in Fig.4.2. 6A 3A 3T 3T´ 4A 5A 4T´ 4T 6A´ 4A´ 5T 5A´ 6T 3A´ NH2 (CH2)a (CH2)b (CH2)c 9.34 9.00 8.62 8.52 8.30 8.14 7.78 7.73 7.46 7.30 6.98 4.92 1.64 1.10 0.66 Interaction between ruthenium polypyridyl complexes and 9-ethylguanine A previous 1H NMR study of the interaction between each of the complexes 1a-c ([Ru(apy)(tpy)L2](2-n)+, where L = Cl-, H2O and CH3CN, respectively) and 9-EtGua42 was described in chapter 3. This study proved that these three complexes are capable of binding to the DNA model base in water at 310 K and pH = 7, albeit to a limited extent and with different kinetics in each case. Carrying out a kinetic study of these reactions was only possible for complexes 1b and 1c, while the low water-solubility of complex 1a allowed only for qualitative observations to be made. This previous study analyzed the influence of the respective leaving ligands (Cl-, H2O and CH3CN) on the reaction rate of each complex with 9-ethylguanine. In the present study a possible relationship between structure and activity is sought. For this purpose, a whole series of related compounds, which have different didentate ligands, as well as a dinuclear analogue, are taken into account. The above-mentioned 1H NMR study was carried out involving 9-ethylguanine and the complexes [Ru(azpy)(tpy)Cl]+ (1e) and [Ru(impy)(tpy)Cl]+ (1f), respectively. The hydrolysis of these complexes in the same experimental conditions and absence of the DNA model base was also followed by 1H NMR. Comparison of the spectra indicated that both compounds 1e and 1f undergo two reactions, as it had previously been reported for the case of 1c.42 The major reaction is hydrolysis. Each complex also reacts with 9-EtGua to form a ruthenium-model base adduct. The reaction between 1e and 9-EtGua is estimated to reach its maximum in about 2 hours, with an approximate conversion of 25%, while the complex 1f yields as much as a 60% conversion, in a longer reaction that proceeds for about 9 hours (see Fig.4.3 and Table 4.2). The maximum conversions observed in the cases of complexes 1b and 1c were reported to be 20% in 5 hours and 30% in 18 hours, respectively.42 H8(free 9-EtGua) H8(free 9-EtGua) H8(1e-model-base adduct) 6A(1e-model-base adduct) H8(1f-model-base adduct) 6A(1f-model-base adduct) 6A(hydrated 1f) 6A(hydrated 1e) 6A(1e) 6A(1f)
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