QD-3, a novel aluminoborate (TETA)(2)[Al2B10 O-20]center dot 0.25H(2)O (TETA = triethylenetetramine), has been solvothermally synthesized and characterized by IR, thermogravimetric analysis, power X-ray diffraction, elemental analysis, and single-crystal X-ray diffraction. This compound crystallizes in the orthorhombic system, space group Pna2(1) (No. 33), a = 25.9174(2) angstrom, b = 7.4028(5) angstrom, c = 17.013(4) angstrom,, V= 3264.2(2) angstrom(3), and Z= 4. Its structure consists of AlO4 tetrahedra and 85010 clusters, which are interconnected and form a three-dimensional framework with large 11-, 12-, and 14-ring channels.