2D and 3D Supramolecular Assemblies from Bis(dipyridylamine) Ligands:Syntheses and Crystal Structures

Starting from two bis(dipyridylamine) ligands containing 4,4′-dipyridylamine moieties,two novel coordination polymers,[CdL1Br2]n·7.5nH2O[L1=N,N,N′,N′-tetrakis(4-pyridyl)-1,4-phenylenediamine](1) and [Cu2L2(μ1,1,3-SCN)2]n·nMeOH[L2=N,N-di(2-pyridyl)-N′,N′-di(4-pyridyl-1,4-phenylenediamine](2),were prepared under solvothermal conditions.Their structures were characterized by elemental analyses,IR spectrum and X-ray single-crystal diffraction measurements.In complex 1,L1 utilizes all its pyridyl nitrogens to coordinate with four Cd(Ⅱ) centers to afford a three-dimensional(3D) supramolecular assembly containing Kagome structures.Complex 2 has a 2D sheet structure composed of ∞ columns and bridging L2 ligands with SCN-coordinated in a rare μ1,1,3-bridging mode.It is noteworthy that the 2,2′-dipyridylamine unit of L2 is unexpectedly left noncoordinated.