The synthesis, spectral characterisation and X-ray structure determination of the first zinc(II) ferrocenedicarboxylate [Zn(1,1 -Ferdc)(1-methylimidazole) 2 ] 2 , 1, (1,1 -H 2 ferdc = 1,1 -ferrocenedicarboxylic acid) is described. The molecular structure of 1 consists of a centrosymmetric cyclic dimer exhibiting a slightly distorted tetrahedral geometry around the zinc atoms. The ferrocenedicarboxylic acid acts as a syn-bound O,O -bridging ligand.