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Results and discussion Synthesis The synthesis of two novel bis(4-hydroxycoumarin) derivatives, PBHC (3,3’-(pyren-1-ylmethylene) bis(4-hydroxy-2 H -chromen-2-one) and MPBHC ((E)-3,3’-(3-(4-methoxyphenyl) prop-2-ene-1,1-diyl) bis (4-hydroxy-2 H chromen-2-one)) were accomplished by refluxing two equivalents of 4-hydroxycoumarin with one equivalent of an aromatic aldehyde in ethanol