Photosynthesis ofChlorella vulgaris as affected by diaqua(4-chloro-2-methylphenoxyacetato)copper(II) complex

Inhibitory effect of diaqua(4-chloro-2-methylphenoxyacetato)copper(II) complex (MCPACu) on oxygen evolution rate in algaeChlorella vulgaris was found. Electron paramagnetic resonance and fluorescence spectroscopy showed that the sites of action of MCPACu are Z+ and Y+ intermediates on the donor side of photosystem 2 as well as the manganese cluster in the oxygen evolving complex.