Triply interpenetrating coordination polymers based on paddle-wheel type secondary-building units of M2(CO2R)4: [Ni3(2,6-NDC)3(bipy)1.5], [Co3(2,6-NDC)3(bipy)1.5], and [Co(1,3-BDC)(bipyen)] (2,6-NDC=2,6-naphthalenedicarboxylate; 1,3-BDC=1,3-benzenedicarbo

Triply interpenetrating 3-dimensional nickel and cobalt coordination polymers, [M3(2,6-NDC)3(bipy)1.5], were prepared from metal nitrate {M(NO3)2·6H2O}, 2,6-naphthalenedicarboxylic acid (2,6-NDCH2), and 4,4′-bipyridine (bipy) under hydrothermal (M=Ni) or water–benzene hydro(solvo)thermal (M=Co) conditions. Both polymers have the same secondary building units (SBUs) of paddle-wheels of the type [M2(CO2R)4], which are composed of two metals and four di(monodentate) bridging carboxylates. On the other hand, the hydrothermal reaction of Co(NO3)2·6H2O with 1,3-benzenedicarboxylic acid (1,3-BDCH2) and trans-1,2-bis(4-pyridyl)ethylene (bipyen) gave a 2-dimensional polymer [Co(1,3-BDC)(bipyen)]. The structures of all products were determined by X-ray diffraction.