A zero-dimension and a one-dimension polyoxovanadates [Na-15-C-5]_4 (H)_2V_(15)O_(36)Cl(H_2O)_2 (1) and [K-18-C-6]_4(H)_2V_(15)O_(36)Cl (2) have been hydrothermally synthesized and characterized by single- crystal X-ray diffraction. Compound 1 is crystallized in monoclinic space group C2/c with a = 2.8492 (1) nm, b = 1.4842 (3) nm, c = 2.3741 (1) nm, β= 12.411 (1)°, V = 8.3126(7) nm~3, Z = 4, R = 0.0558, R_w = 0.0988. Compound 2 is crystallized in monoclinic space group C2/c with a = 2.5588(1) nm, v = 1.4921(1) nm, c = 2.7113(2) nm, β= 117.90(2)°, V = 9.148(1) nm~3, Z = 4, R = 0.0540, R_w 0.1485. There is a dimeric cation [K-18-crown-6]_2~(2+) with double-charge as a bridge-linkage in the one-dimensional polyoxovanadate compound. The structures analysis of 1 and 2 reveals that the geometrical deformability of the coordinated cation has a significant effect on the structure.

Key words: HYDRO-THERMAL REACTION, CROWN ETHER COMPOUNDS, CRYSTAL STRUCTURE, VANADIUM, OXYGEN, CLUSTER COMPOUND, XRD, STRUCTURE CHARACTERISTICS