dianthrone

Dianthrone is a term used in organic chemistry to denote a class of diaryl ketone pigments that are derived from anthracene. The name historically referred to several related compounds in which two aromatic units related to anthracene are connected by a central linkage. These substances belong to the broader family of anthracene-based dyes and pigments and are characterized by extended conjugation, which imparts vivid colors and notable lightfastness.

Structures of dianthrones vary; most examples are dimeric, featuring two fused aromatic cores with a bridging moiety. The exact connectivity can differ, leading to a family with different optical properties. Dianthrones were investigated in the late 19th and early 20th centuries as potential dye intermediates and pigment components and played a role in early coal-tar dye chemistry. They have largely been superseded by more stable or economical dyes, but some derivatives are still of interest in pigment chemistry and materials science.

Properties typically include strong coloration, resistance to some solvents, and varying thermal stability depending on substituents. They are usually poorly soluble in water but soluble in organic solvents. Safety considerations align with other polycyclic aromatic pigments: exposure should be minimized, and proper handling and disposal procedures followed.

See also: anthracene, anthraquinone, anthrone, coal-tar dyes, pigment chemistry.