An inclined interpenetrating heteropolynuclear polymer with unusual propagation of metal carboxylate secondary building units by both carboxylate and pyridyl bridging ligands

The objective of this paper is to describe an unusual coordination polymer, M4(μ4-O)(bipy)(m-BDC)3 (sM4 = Zn2.36 Co1.64, bipy = 4,4′-bipyridine, m-H2BDC = 1,3-benzenedicarboxylic acid) (1), which has been hydrothermally synthesised and characterized by single-crystal X-ray diffraction, XRPD, IR, TGA, ICP, atomic absorption, and element analysis. 1 crystallizes in the P42/mnm space group and contains a M4O(O2C)6 secondary building unit (SBU) with an inclined interpenetrated (4, 4) topology, and is a rare combination of the two most successful approaches to coordination polymer design: generation of metal carboxylate SBUs and the use of pyridyl donor bridges. Moreover, complex 1 exhibits intense fluorescence at about 424 nm (λex = 312 nm) in the solid state.