Preparation of novel polymorphic pigment 3,3′-(4,4′-biphenyldiylbisthio)bis-2-methyl-1,4-naphthoquinone and its polymorphic properties†
Abstract
The novel pigment 3,3′-(4,4′-biphenyldiylbisthio)bis-2-methyl-1,4-naphthoquinone comprising two naphthoquinone units was successfully synthesized. This pigment exhibits three conformational polymorphs, all of which have different colors (light red, red, and deep red).