A silver complex of general formula or: Ag + ---[L 1 - M +] Ag + ---[L 2 H +] + Y -] wherein: in formula I: [L 1 - M +] is a moiety of general formula: wherein: X is selected from the group consisting of -NH-, -O-, -S- and -NR-, wherein R is a C 1 -C 6 linear or branched alkyl group C 1 -C 6 Alk, or a carbonyl-C 1 -C 6 linear or branched alkyl group -C -C 1 -C 6 Alk, preferably acyl group -C -CH 3,and M + is hydrogen ion or an alkali. metal ion, preferably sodium ion Na + and wherein in formula II: Y - represents a counter anion, preferably selected from: acetate, nitrate, lactate, trifluoromethane, chlorate, bromide and sulphonate; [L 2 H +] + is the protonated form of the ligand moiety, selected from: 2-mercapto-4-(C 1 -C 6 -Alk)-pyrimidine, preferably 2-mercapto-4-methylpyrimidine, 2-mercapto-4-(C 1 -C 6 Alk) pyrimidine hydrochloride, 8-mercapto-quinoline hydrochloride, preferably 2-mercapto-4-methylpyrimidine hydrochloride. wherein in both formulae and. the Ag + ion is coordinated to the thiolic sulfur atom of [L 1 - M +] and [L 2 H +] + respectively. Ag + ---[L 1 - M +] Ag + ---[L 2 H +] + Y -] in formula I: [L 1 - M +] is a moiety of general formula: wherein: X is selected from the group consisting of -NH-, -O-, -S- and -NR-, wherein R is a C 1 -C 6 linear or branched alkyl group C 1 -C 6 Alk, or a carbonyl-C 1 -C 6 linear or branched alkyl group -C -C 1 -C 6 Alk, preferably acyl group -C -CH 3,and M + is hydrogen ion or an alkali. metal ion, preferably sodium ion Na + and wherein in formula II: Y - represents a counter anion, preferably selected from: acetate, nitrate, lactate, trifluoromethane, chlorate, bromide and sulphonate; [L 2 H +] + is the protonated form of the ligand moiety, selected from: 2-mercapto-4-(C 1 -C 6 -Alk)-pyrimidine, preferably 2-mercapto-4-methylpyrimidine, 2-mercapto-4-(C 1 -C 6 Alk) pyrimidine hydrochloride, 8-mercapto-quinoline hydrochloride, preferably 2-mercapto-4-methylpyrimidine hydrochloride. wherein in both formulae and. the Ag + ion is coordinated to the thiolic sulfur atom of [L 1 - M +] and [L 2 H +] + respectively. [L 1 - M +] is a moiety of general formula: wherein: X is selected from the group consisting of -NH-, -O-, -S- and -NR-, wherein R is a C 1 -C 6 linear or branched alkyl group C 1 -C 6 Alk, or a carbonyl-C 1 -C 6 linear or branched alkyl group -C -C 1 -C 6 Alk, preferably acyl group -C -CH 3,and M + is hydrogen ion or an alkali. metal ion, preferably sodium ion Na + X is selected from the group consisting of -NH-, -O-, -S- and -NR-, wherein R is a C 1 -C 6 linear or branched alkyl group C 1 -C 6 Alk, or a carbonyl-C 1 -C 6 linear or branched alkyl group -C -C 1 -C 6 Alk, preferably acyl group -C -CH 3,and M + is hydrogen ion or an alkali. metal ion, preferably sodium ion Na + and wherein in formula II: Y - represents a counter anion, preferably selected from: acetate, nitrate, lactate, trifluoromethane, chlorate, bromide and sulphonate; [L 2 H +] + is the protonated form of the ligand moiety, selected from: 2-mercapto-4-(C 1 -C 6 -Alk)-pyrimidine, preferably 2-mercapto-4-methylpyrimidine, 2-mercapto-4-(C 1 -C 6 Alk) pyrimidine hydrochloride, 8-mercapto-quinoline hydrochloride, preferably 2-mercapto-4-methylpyrimidine hydrochloride. wherein in both formulae and. the Ag + ion is coordinated to the thiolic sulfur atom of [L 1 - M +] and [L 2 H +] + respectively. Y - represents a counter anion, preferably selected from: acetate, nitrate, lactate, trifluoromethane, chlorate, bromide and sulphonate; [L 2 H +] + is the protonated form of the ligand moiety, selected from: 2-mercapto-4-(C 1 -C 6 -Alk)-pyrimidine, preferably 2-mercapto-4-methylpyrimidine, 2-mercapto-4-(C 1 -C 6 Alk) pyrimidine hydrochloride, 8-mercapto-quinoline hydrochloride, preferably 2-mercapto-4-methylpyrimidine hydrochloride. wherein in both formulae and. the Ag + ion is coordinated to the thiolic sulfur atom of [L 1 - M +] and [L 2 H +] + respectively.