On the Interaction of Gold(III) Complexes with Methionine

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The interaction of gold(III) complexes AuCl4–, Au(bipy)Cl2+, Au(en)23+ and Au(C9H19N4)2+ with methionine (HMet) in an aqueous solution (pH 2.0 и 7.4; I = 0.2 M (NaCl), CAu = (5–10) × 10–5 M, CHMet < (6–50) × 10–5 M) at 25°C was studied. Methionine reduces gold(III) to gold(I), but the processes proceed much more slowly (hundreds of times) than under the action of thiols. As the density of ligands in the gold(III) complex increases, the rate of reactions with HMet decreases significantly.

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作者简介

V. Kharlamova

Nikolaev Institute of Inorganic Chemistry of the Siberian Branch of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: kharlamova@niic.nsc.ru
俄罗斯联邦, Novosibirsk, 630090

I. Mironov

Nikolaev Institute of Inorganic Chemistry of the Siberian Branch of the Russian Academy of Sciences

Email: kharlamova@niic.nsc.ru
俄罗斯联邦, Novosibirsk, 630090

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2. Fig. 1. Time variation of the UV spectrum of the solution upon interaction of AuCl4- with methionine (CAu = 1.0 × 10-4 mol/L, pH 2, l = 1 cm): a - CHMet = 6. 0 × 10-5 mol/L, time after mixing τ = 6 c (1), 30 s (2), 1 min (3), 1 min 30 s (4), 2-30 min (5); b - CHMet = 5.0 × 10-4 mol/L, time after mixing τ = 8 c (1), 30 s (2), 1 min (3).

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3. Fig. 2. Time variation of the UV spectrum of the solution upon interaction of Au(bipy)Cl2+ with HMet. CAu = 1.0 × 10-4 mol/L, CHMet = 6.0 × 10-5 mol/L; τ = 5 c (1), 10 (2), 20 (3), 40 (4), 60 (5), 76 (6), 109 (7), 143 (8), 174 (9), 230 min (10); pH 2.0, l = 1 cm.

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4. Fig. 3. Time variation of the UV spectrum of the solution upon interaction of Au(bipy)(OH)2+ with HMet. CAu = 1.0 × 10-4 mol/L, CHMet = 6.0 × 10-5 mol/L; τ = 5 c (1), 1 (2), 5 (3), 10 (4), 20 (5), 30 (6), 40 (7), 50 (8), 60 (9), 70 (10), 80 min (11); pH 7.4, l = 1 cm.

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5. Fig. 4. Time variation of the UV spectrum of the solution upon interaction of Au(en)2* with HMet. CAu = 1.0 × 10-4 mol/L, CHMet = 5.0 × 10-4 mol/L; τ = 7 c to 20 min (1); pH 7.4, l = 1 cm. Addition of HCl to the solution to CHCl = 1.6 mol/L, τ = 8 c (2), 5 (3), 10 (4), 15 min (5).

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6. Fig. 5. Structure of the Au(C9H19N4)2+ complex.

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7. Fig. 6. Time variation of the UV spectrum of the solution upon interaction of Au(C9H19N4)2+ with GSH. CAu = 5.2 × 10-5 mol/L, CGSH = 1.0 × 10-3 mol/L; τ = 8 c (1), 5 (2), 15 (3), 25 (4), 35 (5), 45 (6), 55 (7), 70 (8), 90 (9), 115 (10), 140 (11), 230 min (12); pH 7.4, l = 1 cm.

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