Structural diversity in cobalt camphorate coordination polymers with flexible dipyridylamide ligands including looped layers and self-penetrated topologies

摘要

Hydrothermal reaction of cobalt nitrate, D-camphoric acid, and flexible dipyridylamide ligands afforded a series of coordination polymers with diverse structural topologies, as characterized by single crystal X-ray diffraction. {[Co-2(DL-cam)(2)(edn)]center dot 2H(2)O}(n) (1, edn= N,N'-(ethane-1,2-diyl)dinicotinamide) shows a 3D 4(12)6(3) pcu net built from straight-pillaring of {Co-2(OCO)(4)} paddlewheel dimer-based [Co-2(DL-cam)(2)](n) layer motifs. In contrast, [Co (D-cam)(edin)](n) (2, edin= N,N'-(ethane-1,2-diyl)diisonicotinamide) manifests a two-fold parallel interpenetrated looped layer topology. {[Co-2(DL-cam)(2)(bdin)]center dot 2H(2)O}(n) (3, bdin= N,N'-(butane-1,4-diyl)diisonicotinamide) displays a very rare 3D 4(4)6(10)8 roa self-penetrated net built from cross-pillaring of {Co-2(OCO)(4)} paddlewheel dimer-based [Co-2(DL-cam)(2)](n) layer motifs, as does {[Co-2(DL-cam)(2)(pedin)]center dot 2H(2)O}(n) (4, pedin = N,N'(pentane-1,5-diyl)diisonicotinamide). [Co(D-cam)(hdin)](n) (5, hdin= N,N'-(hexane-1,6-diyl)diisonicotinamide) shows a simple stacked system of sawtooth (4,4) grid motifs. Thermal properties are discussed herein.