Hydrothermal synthetic investigations to prepare new A(2)Mo(3)TeO(12) (A = NH4, Cs, Rb, K) compounds are described Novel noncentrosymmetric layered tellurites, (NH4)(2)Mo3TeO12 (1) and Cs2Mo3TeO12 (2), have been synthesized by hydrothermal methods. Their structures contain two-dimensional hexagonal tungsten oxide related (Mo3TeO12)(2-) anionic layers interleaved with NH4+/Cs+ ions. New "zero-dimensional" tellurites, Rb4Mo6Te2O24. 6H(2)O (3) and K4Mo6Te2O24. 6H(2)O (4), containing discrete centrosymmetric (Mo6Te2O24)(4-) anionic aggregates and alkali metal ions have been synthesized by simple refluxing of stoichiometric reactants in water. In this hexamolybdoditellurite anion, the Mo6O24 flat hexagonal ring, formed from edge sharing of six MoO6 octahedra, is capped by tellurium on both sides. The two types of anions have the same empirical formula. Cs2Mo3TeO12 (2) could be prepared by a solid state reaction as well. All four new tellurites have been structurally characterized by single-crystal X-ray diffraction studies. Pertinent crystal, data are as follows : for 1, hexagonal space group P6(3), a = 7.332(2) Angstrom, c = 12.028(4) Angstrom, Z = 2 : for 2, hexagonal space group P6(3), a = 7.3956(10) Angstrom, c = 12.186(2) Angstrom, Z = 2; for 3, monoclinic space group P2(1)/c. a = 10.0564(14) Angstrom, b = 9.877(8) Angstrom, c = 15.724(3) Angstrom, beta = 109.988(11)degrees; Z = 2 : for 4, monoclinic space group P2(1)/c, a = 9.878(3) Angstrom, b = 9.724(4) Angstrom, c = 15.301(3) Angstrom, beta = 108.57(2)degrees, Z = 2. Low-temperature syntheses, structure, and powder X-ray diffraction, spectroscopic, and thermal studies of compounds 1-4 are described.