A novel 5-aminoisophthalate compound, [Mn(C8H5NO4)’H2O]n·2nH2O 1, has been synthesized by the hydrothermal assembly of 5-aminoisophthalic acid with manganese acetate. Ele- mental analysis, X-ray crystal structure analyses, IR spectra, FT-Raman and ESR were carried out for the structural determination and characterization of the title compound. Compound 1 crystallizes in triclinic, space group P1 with a = 7.7562(2), b = 8.6121(3), c = 8.7107(2) ’, α = 85.411(2), β = 76.030(2), γ = 66.510(2)o, V = 517.76(3) ’3, MnC8H11NO7, Mr = 288.12, Z = 2, Dc = 1.848 g/cm3, μ = 1.300 mm–1, F(000) = 294, R = 0.0381 and wR = 0.1043 for 1652 observed reflections (I > 2σ(I)).