The work is devoted to the development of a method for obtaining a highly sensitive composition of a controlled composition containing cationic water-soluble 5,10,15,20-tetrakis(N-Me-pyridin-3-yl)chlorine and 5,10,15,20-tetrakis(N-Me-pyridin-3-yl)bacteriochlorin. The process of diimide reduction of 5,10,15,20-tetrakis(pyridin-3-yl)porphine in pyridine and in the absence of a solvent has been studied. It is shown that the reduction in the alloy significantly reduces the reaction time (from 12 to 1.5 h) and allows to obtain compositions with a yield of up to 90%.