Two new holmium-succinate frameworks have been synthesized by hydrolysis in situ of the succinylsalicylic acid under different hydrothermal conditions. Compound 1, [Ho-2(C4H4O4)(3)(H2O)(2)] center dot 0.33(C7H6O3), P (i) over bar space group, has a novel structure composed by 1D-SBUs consisting of [HoO9] chains of polyhedra linked by the succinate ligands giving a 3D framework. Compound 2, [Ho-2(C4H4O4)(3)(H2O)(2)], also belonging to the P (i) over bar space group, has a denser structure. The role of the in-situ-generated salicylic acid on formation of both structures is studied by means of a synthesis design methodology. A topological study of the new holmium succinate compounds in comparison with the previously reported 3D holmium-succinate framework is performed here.