Three new asymmetric bis-Schiff bases containing thiocarbohydrazide were synthesized by the reaction of thiocarbohydrazide with ketone and different aldehydes step by step.

The dithiocarbohydrazones were synthesized by aromatic aldehyde or aromatic ketone with thiocarbonohydrazide to boserve their photoelectric properties.

Four asymmetric bis(thiosemicarbazone) 3a~3d are synthesized from the following steps: firstly hydrazine reacted with carbon disulfide carbonate,catalyzed by 2-chloroethanol,to form thiocarbonohydrazide(1) with yield of 82%,then the compound(1) further reacted with ketone or aldehyde in ethanol at 780C step by step to give 3a~3d with yields of 70%~87%.

Nine new substituted-benzaldehyde dithiocarbohydrazones were synthesized by reaction of dithiocarbohydrazide with substituted-benzaldehydes in the presence of ethanol and the structures were characterized by 1H NMR, IR and elemental analysis.