Syntheses, Structures, and Photoluminescence of a Series of d¹⁰ Coordination Polymers with R-Isophthalate (R = −OH, −CH₃, and −C(CH₃)₃)

Eight new d 10 metal−organic coordination polymers, [Zn(mip)(bpa)] n ( 1 ), [Zn(mip)(bpp)] n ( 2 ), [Cd(mip)(bpp)] n ( 3 ), [Zn 2 (tbip) 2 (bpa)(H 2 O)] n ( 4 ), [Zn 2 (tbip) 2 (dpe)(H 2 O)] n ( 5 ), {[Zn(tbip)(bpp)]·H 2 O} n ( 6 ), {[Cd(tbip)(bpp)(H 2 O)]·3H 2 O} n ( 7 ), and {[Cd(tbip)(H 2 O)(bipy) 0.5 ]·H 2 O} n ( 8 ) were prepared through hydrothermal reactions of H 2 mip or H 2 tbip (H 2 mip = 5-methylisophthalic acid and H 2 tbip = 5-tert-butylisophthalic acid) with different pyridyl-containing ligands (bpa = 1,2-bis(4-pyridyl)ethane, bpp = 1,3-bis(4-pyridyl)propane, dpe = 1,2-di(4-pyridyl)ethene and bipy = 4,4′-bipyridine), respectively. Except for complexes 2 and 6, all the other six compounds were reported for the first time. These complexes were structurally characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. Complex 1 is a 3-fold interpenetrating three-dimensional (3D) network with CdSO 4 topology constructed from alternately left-handed and right-handed helical channels. Complexes 2 and 3 are 4-fold interpenetrated diamondoid-like networks. Polymers 4 and 5 are isostructural, showing 2-fold 3D interpenetrating α-Po networks constructed from binuclear zinc nodes. Complex 6 possesses a two-dimensional (2D) corrugated network. Complex 7 has a one-dimensional (1D) tube-like chain along the a direction and is further linked by hydrogen bonding and π−π stacking interactions to form a 3D supramolecular network. Complex 8 features a 2D layer and further forms a 3D supramolecular framework by hydrogen bonding. These results show that the influence of steric hindrance of an organic ligand on the structures of d 10 coordination polymers is realized through changing the substituted groups of the dicarboxylate derivatives. Furthermore, thermal stabilities and photoluminescent properties of the complexes were also studied in the solid state.