论文部分内容阅读
合成了α Na7H[GaW9Fe3 (H2 O) 3 O3 7]·16H2 O(简写为α GaW9Fe3 ,以下类同 )通过红外、紫外、元素分析、光电子能谱、极谱等手段进行了表征 ,并对该配合物的红外、紫外、元素分析、光电子能谱进行分析。配合物的红外光谱都出现了Keggin杂多阴离子所具有的νas(W—Oa—W ) ,νas(W—Ob—W ) ,νas(W—Oc—W) 和νas(W—Od—W ) 四种基本特征振动峰 ,表明所合成配合物也具有Keggin结构。所合成的配合物的紫外光谱都在2 10和 2 6 8nm附近有两个荷移跃迁带 ,分别对应于Od—W的 pπ dπ 荷移跃迁和Ob/Oc的 pπ dπ 荷移跃迁。Ob/Oc 的 pπ dπ荷移跃迁为特征吸收峰。GaW9和GaW9Fe3 都有一个 4电子还原波 ,且E1/ 2 比GaW9更负 ,因此所合成的配合物GaW9Fe3 为α体。GaW9Fe3 室温的磁矩比有效磁矩纯自旋值 6 0 3× 10 -2 3 A·m2 低 ,这暗示了杂多阴离子的三金属簇中 3个铁原子间存在反铁磁性自旋交换作用。对M ssbauer谱进行了分析 ,铁与桥氧之间形成了d pπ键 ,铁的d轨道与桥氧的 p轨道发生了重叠 ,p ,d电子之间产生了反磁性交换。因此M ssbauer谱是研究配合物磁性的有效手段。对该配合物的红外、紫外、光电子能谱、M ssbauer谱进行分析。为深入研究磁性与配合物结构的关系 ,为进一步研究其作为功能材
Α Na 7 H [GaW 9 Fe 3 (H 2 O) 3 O 3 7] · 16H 2 O (abbreviated as α GaW 9 Fe 3, the same applies below) was synthesized and characterized by IR, UV, elemental analysis, photoelectron spectroscopy and polarography. Complex infrared, UV, elemental analysis, photoelectron spectroscopy analysis. The infrared spectra of the complexes showed νas (W-Oa-W), νas (W-Ob-W), νas (W-Oc-W) and νas (W-Od-W) possessed by the Keggin heteropolyanions. The four basic characteristic vibration peaks show that the synthesized complexes also have Keggin structure. The UV spectra of the synthesized complexes have two charge transition bands near 2 10 and 2 6 8 nm, corresponding to the pπ dπ charge transitions of Od-W and the pπ dπ charge transitions of Ob / Oc, respectively. The pπ dπ charge transition of Ob / Oc is the characteristic absorption peak. GaW9 and GaW9Fe3 have a 4-electron reduction wave, and E1 / 2 is more negative than GaW9, so the synthesized complex GaW9Fe3 is α-body. The magnetic moment of GaW9Fe3 at room temperature is lower than the effective spins of the effective magnetic moment of 6 0 3 × 10 -2 3 A · m2, suggesting the existence of antiferromagnetic spin exchange between the three iron atoms in the heteropolyanion clusters . The M ssbauer spectrum was analyzed. The dpπ bond formed between iron and bridge oxygen. The d orbital of iron overlaps with the p orbital of bridging oxygen, and the diamagnetic exchange occurs between p and d electrons. Therefore, the M ssbauer spectrum is an effective means to study the magnetic properties of complexes. The infrared, ultraviolet, photoelectron spectroscopy and M ssbauer spectra of the complex were analyzed. In order to further study the relationship between magnetic and complex structure, for further study of its function as a material