Abstract
Abstract Four diamines containing inbuilt imide and thioamide linkages—N,N′-bis[(4,4′-bis(thiourea)diphenyl methane)] pyromellitimide, N,N′-bis[(1,4-phenyl bis(thiourea)] pyromellitimide N,N′ bis[(4,4′bis(thiourea)diphenyl ether)] pyromellitimide; and N,N′-bis[(4,4′-bis(thiourea)diphenyl sulfone)] pyromellitimide—were synthesized by the reaction of 4-phenylene bis(thiourea); 4,4′-bis(thiourea) diphenyl ether; and 4,4′-bis(thiourea) diphenyl sulfone, respectively, with pyromellitic dianhydride in a pyridine/acetic acid mixture using microwave-assisted radiation. Structural characterization of these diamines was undertaken using FT-IR and 1HNMR spectroscopy, along with elemental analysis. The synthesized diamines show good solubility in highly polar organic solvents.
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