Fig. 9From: Equilibria in cobalt(II)–amino acid–imidazole system under oxygen-free conditions: effect of side groups on mixed-ligand systems with selected L-α-amino acidsDistribution diagram of complex species versus pH for a solution of: a Co[(imid)2]n and histidine in molar ratio 1:5. C Co = 0.01 mol L−1. L–histidine (HisH-1), L′–imidazole (Himid); b Co(NO3)2 and histidine in molar ratio 1:5. C Co = 0.04 mol L−1. L–histidine (His−)Back to article page