Three new Keggin polyoxometalates, [Zn(phen) 3 ] 2 [SiW 12 O 40 ]·5H 2 O(1), [Co(phen) 3 ] 2 [SiW 12 O 40 ](2) and [Ni(phen) 3 ] 2 [SiW 12 O 40 ]·2H 2 O(3)(phen=1,10′-phenanthroline) have been hydrothermally synthesized and characterized by elemental analysis, IR, crystal X-ray diffraction, thermogravimetric analyses(TGA) and fluorescence techniques. Complex 1, crystallized in the triclinic space group P1, consists of one [SiW 12 O 40 ] 4– anion, two discrete [Zn(phen) 3 ] 2+ cations and five crystal water molecules. Complexes 2 and 3 have the similar configuration to complex 1, but they crystallized in the monoclinic space group C2/c. Variable-temperature magnetic susceptibilities of complexess 2 and 3 reveal antiferromagnetism and ferromagnetism, respectively.
ZHANG Yong-feng JIA Yan-yan NIE Hai-liang YAN Xing-juan WANG Li HUANG Ru-dan
