title: [Synthesis and spectroscopic analysis of complex alpha-Na7H[GaW9Fe3(H2O)3O37] x 16H2O].
abstract: Alpha-Na7H[GaW9Fe3(H2O)3O37] x 16H2O has been synthesized and it's IR, UV, ICP and XPS, have been studied. The IR spectrum exhibits nu(as)(w-o(a)-w), nu(as)(w-o(b)-w), nu(as)(w-o(c)-w) and nu(as)(w-o(d)-w) four peaks, which indicates that it has Keggin structure. The UV spectrum has two peaks, at 210 and 268 nm, corresponding to O(d)-W-->p pi-d pi and O(b)/O(c)-->p pi-d pi. O(b)/O(c)-->p pi-d pi is character peak. Both GaW9 and GaW9Fe3 have a 4 electrons reductive peaks, with E(1/2) of GaW9 minus even more, the GaW9Fe3 is alpha. Mössbauer spectrum has been studied. Effective magnetic moment is 6.00 x 10(-23) A x m2. The Mössbauer spectrum at 75 K shows an isomer shift delta = 0.43 mm x s(-1), within the range of 0.3 to 0.6 mm x s(-1) observed for high-spin iron(III) complexes. The authors found that title complex has antiferromagnetic properties. These kinds of heteropoly compounds have attracted our attention for the study of new materials.
authors.affiliation: Department of Chemistry, Northeast Normal University, Changchun 130024, China.
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Xiu-li
authors.initials: XL
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Hou
authors.forename: En-bo
authors.initials: EB
authors.lastname: Wang