Tricarballylic acid (propane-1,2,3-tricarboxylic acid, H-3 tca) was reacted with uranyl nitrate hexahydrate under solvo-hydrothermal conditions and in the presence of different additional cations, yielding four complexes which have been crystallographically characterized. [(UO2)(2)Ba(tca)(2)(H2O)(4)] (1), isomorphous to the Pb-II analogue previously reported, crystallizes as a triperiodic framework in which diperiodic uranyl-tca(3-) subunits with the hcb (honeycomb) topology are linked by carboxylate-bound Ba-II cations. Triperiodic polymerization is also found in [(UO2)(2)(tca)(2)Ni(cyclam)] (2) and [(UO2)(2)(tca)(2)Cu(R,S-Me(6)cyclam)] (3), but here the diperiodic uranyl-tca(3-) subunits have the sql (square lattice) topology, and the frameworks formed through bridging by Ni-II or Cu-II cations have different topologies, tcs in 2 and xww in 3. [Co(en)(3)][UO2(tca)](3)center dot 2H(2)O (4) crystallizes as a monoperiodic coordination polymer with the hcb topology and a nanotubular geometry. In contrast to the square-section nanotubules previously found in [NH4][(UO2)(2)Pb(tca)(2)(NO3)(bipy)] (bipy = 2,2'-bipyridine), those in 4 have a hexagonal section with a width of similar to 7 angstrom. The structure-directing role of the hydrogen bonded counterions in these nanotubular species, either NH4+ located within the nanotubule cavity or [Co(en)(3)](3)(+) located outside, is discussed. Emission spectra in the solid state display the usual vibronic fine structure for 1 and 4, while uranyl emission is quenched in 3.