Abstract
Hydrothermal reactions of 5-methoxyisophthalic acid (MeO-H2ip), 1,3-di(4-pyridyl)propane (bpp) with Cd(NO3)2·4H2O and Ni(NO3)2·6H2O produced [Cd2(MeO-ip)2(bpp)2]n·nH2O (1) and [Ni(MeO-ip)(bpp)(H2O)]n·nH2O (2), respectively. Complex 1 is a 2-D layer consisting of dinuclear Cd(II)-carboxylate units, two carboxylates of MeO-ip adopt μ2,η2-bridging and chelating modes. MeO-ip bridges three Cd(II) ions to form a 1-D [Cd2(MeO-ip)2]n chain, which is further extended into a 2-D layer by bpp in a trans,trans-conformation. However, two carboxylates of MeO-ip in 2 are monodentate and chelating to link Ni(II) into a 1-D [Ni(MeO-ip)]n chain with bpp in a trans-gauche conformation connecting [Ni(MeO-ip)]n chains into a two-fold interpenetrating 3-D network. Coordinated water and carboxylate oxygen from different MeO-ip form strong hydrogen bonds. The frameworks of 1 and 2 are stable below 250 and 300 °C, respectively. Luminescence indicates that 1 shows maximum emission at 375 and 450 nm upon excitation at 320 nm. Magnetic measurement of 2 suggests the presence of ferromagnetic interactions in 2.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (21001025), the Natural Science Foundation of Fujian Province (2010J05017), and Provincial Education Department of Fujian (JA12070).