Two new metal-organic coordination polymers of lead with O-, N-donor ligands: Synthesis, characterization, luminescence and thermal behavior

The synthesis of two new lead(II) coordination polymers, [Pb2(picOH)4]·H2O (1) and [Pb3(Sip)2(H2O)2]·H2O (2) has been reported, where HpicOH=3-hydroxypicolinic acid and NaH2Sip=5-sulfoisophthalic acid monosodium salt. Both the complexes were structurally characterized by X-ray single crystal diffraction analysis. Complex 1, where the 3-hydroxypicolinate ligand is used for the first time in conjunction with Pb(II), revealed to be a 1D polymeric array. Complex 2 showed a 3D structure with 5-sulfoisophthalate ligand adopting two novel binding modes of high denticity (η6μ6 and η7μ7). The photoluminescence and thermal properties of the two complexes have been studied.