Structural Diversity of Six Coordination Polymers Based on the Designed X-Shaped Ligand 1,1,1,1-Tetrakis[(3-pyridiniourea)methyl]methane

Abstract

In this study, six coordination polymers (CPs), {[Ag₂(L)(CF₃SO₃)]·CF₃SO₃·2H₂O·DMF}_n (1), {[Ag(L)]·SbF₆·4DMF·H₂O}_n (2), {[Zn(L)_0.5(I)₂]·3.75H₂O}_n (3), {[Cd₂(L)(I)₄(H₂O)(DMF)]·4H₂O·3DMF}_n (4), {[Hg₂(L)(I)₄]·H₂O·4DMF}_n (5) and {[Hg₂(L)(Cl)₄]·2H₂O·3DMF}_n (6), were obtained based on the designed X-shaped urea-based ligand. X-ray single crystal diffraction analysis revealed that complex 1 displayed a 3D (3,4)-connected {6·8²}{6⁴·8²}-tcj net. Complex 2 featured a 2D 4-connected {4³·6³} sheet. Complexes 3 and 5 exhibited a 1D polymeric loop chain. Complex 4 displayed a 1D polymeric fishbone chain. Complex 6 showed a 2D 4-connected {4⁴·6²}-sql sheet. Structural comparison revealed that not only the metal ions, but also the anions played crucial roles in the control of final structures.