catena-Poly[[[(4'-phenyl-2,2':6',2'-terpyridine-κ3N)copper(II)]-μ-terephthalato-κ2O:O′] terephthalic acid]

The title compound, [Cu(C8H4O4)(C21H15N3)]·C8H6O4, consists of polymeric chains in which the terpyridine heterocycle chelates to the Cu atom in an N,N′,N′′-tridentate manner; the Cu atoms are also covalently bonded through the two singly-bonded carboxyl O atoms of the dicarboxyl­ate dianions to give rise to a chain structure. An additional terephthalic acid molecule is hydrogen bonded to the chains. The asymmetric unit contains halves of two different half-molecule terephthalate ions; in each case, the complete ions are generated by inversion symmetry.