Organochromium compounds

Cyclopentadienylchromium tricarbonyl dimer exists in measureable equilibrium quantities with the monometallic radical .

Biochemical dimers

Pyrimidine dimers

Pyrimidine dimers (also known as thymine dimers) are formed by a photochemical reaction from pyrimidine DNA bases when exposed to ultraviolet light. This cross-linking causes DNA mutations,