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Nickel(II) salts and their coordination com pounds with ethyl 5-m ethylim idazole-4-carboxylate (emizco), [Ni(emizco) 2 Cl 2 ], [Ni(emizco) 2 Br 2 ], [Ni(emizco) 2 (H 2 O) 2 ] (NO 3 ) 2  H 2 O · Ni(NO 3 ) 2 , inhibit photosynthetic electron flow (basal, phosphorylating and uncoupled) and ATP-synthesis, therefore behave as Hill reaction inhibitors. Coordination compounds are more potent inhibitors than the salts. It was found that the target for NiCl 2 ; NiBr 2  and Ni(NO 3 ) 2  is at the b 6 f level. On the other hand, the complexes [Ni(Emizco) 2 Cl 2 ], [Ni(Emizco) 2 Br 2 ] and [Ni(emizco) 2 (H 2 O ) 2 ] (NO 3 ) 2 H 2 O binding sites are located at Q B (D1)-protein and b 6 f level. Therefore, they have a common inhibition site located at b 6 f avoiding the PQH 2  oxidation. The Q B  inhibition site was corroborated by variable chlorophyll a fluorescence yield [V(j)]. The emizco ligand has no activity on photosynthetic electron flow.

Interference by Nickel(II) Salts and Their 5-Methylimidazole-4-carboxylate Coordination Compounds on the Chloroplast Redox Chain