An organic-inorganic hybrid material based on paradodecatungstate building blocks and sodium-aminoacetic acid complex subunits,{Na 10 (H 3 N-CH 2 -COO) 2 [H 2 W 12 O 42 ]}Á28H 2 O (1), have been synthesized under mildly acidic conditions. This compound was characterized by single-crystal X-ray diffraction, elemental analysis, IR and UV-visible spectroscopies, and cyclic voltammetry. The compound crystallizes in the triclinic space group P-1 with a = 11.879 (2) Å , b = 12.706(2) Å , c = 13.067(2) Å , a = 74.11(3)°, b = 79.71(3)°, c = 65.95(3)°, V = 1727.2(5) Å 3 , and Z = 1. The crystal structure consists of infinite 2D layers constructed from [H 2 W 12 O 42 ] 10-clusters and sodium-aminoacetic acid complexes; adjacent layers are further joined by the complex units and sodium cations to yield a three-dimensional network.