The preparation of a new trisodium triborate, Na-3[B3O4(OH)(4)], and its complete characterization in terms of molecular structure and thermal behavior are reported. Synthesis of this compound was achieved either by NaBH4 hydrolysis or by thermal treatment of Na[B(OH)(4)]center dot 2H(2)O. The crystal structure was determined by single-crystal X-ray diffraction. The trisodium triborate crystallized in the monoclinic system (a = 12.8274(6) angstrom, b = 7.7276(4) angstrom, c = 6.9690(3) angstrom, and beta = 98.161(3)degrees), space group Cc, Z = 2. The structure of Na-3[B3O4(OH)(4)] comprised [B3O4(OH)(4)](3-) polyanions, based on B-O-containing rings with two tetracoordinated boron atoms and one tricoordinated boron atom in the fragments BO2(OH)(2) and BO3, respectively. These polyanions are interconnected by four intermolecular hydrogen bonds and presented a tilt of 10.470(4)degrees compared to the a axis. Thus, they are stacked by rotation of about 180 degrees around an axis defined by the three-coordinated boron atoms and parallel to the c axis. Such polyanions were only observed previously in two synthetic compounds, M-3[B3O4(OH)(4)].2H(2)O with M = K and Rb, which were isostructural. The originality of the present work was the synthesis and the description of a different crystallographic structure containing this polyanion. Characteristic peaks ranging from 500 to 1500 cm(-1) and around 3300 cm(-1) highlighted the presence of the B-O rings and hydroxyl groups, respectively. The decomposition temperature T = 155 degrees C was obtained by thermogravimetric analysis, and the following equivalent formula in terms of hydration degree was proposed: NaBO2 center dot(2)/3H2O center dot Na-3[B3O4(OH)(4)] decomposed into Na-3[B3O5(OH)(2)] in equilibrium with its vapor.