TlI2D coordination polymer involving close TlI⋯π (aromatic) contacts, [Tl3(μ-BPC)2(μ-NO3)]n

A two-dimensional polymer, [Tl3(μ-BPC)2(μ-NO3)]n [BPC = biphenyl-2-carboxylate], has been synthesized and characterized. Its single-crystal X-ray structure shows three types of TlI-ions with coordination numbers of 5 (Tl1 and Tl2), and 4 (Tl3). Two of the thallium atoms, Tl1 and Tl3, contain close TlI⋯π (aromatic) contacts, thus attaining a total hapticity of 11 and 10 with environments Tl1O5C6 and Tl3O4C6, respectively.