摘要
合成了钼磷铁杂多黄(NH_4)_4[PFeMo_(11)O_(40)H_2]·9H_2O和杂多蓝(NH_4)_4[PFeMo_(11)O_(40)Ha]·11H_2O的铵盐晶体.用_(57)Fe同位素增丰Mossbauer谱法,结合磁化率测定,研究其结构与性质,并讨论了四极分裂值Q(?)和Keggin结构杂多阴离子中MO_6(M=Mo,Fe)八面体畸变大小的关系,进一步证实Keggin结构杂多蓝阴离子中Mo(V)—O—Fe(III)间存在反磁交换作用.
(NH_4)_4(PFe(III)Mo_(11)(VI)O_(40)H_2)·9H_2O (yellow) and (NH_4)_4(PFe(III)Mo(V)Mo_(10) (VI)O_(40)H_3)·11H_2O (blue) have been synthesised. The Mossbauer Spectra of the two heteropolyacid salts have been determined by using the method of ^(57)Fe isotropic enrichment. The IR spectra and magnetic susceptibility have been obtained. It is found that splitting Q_s can be used as an indication of distortion degree of MO_6 (M=Mo, Fe) octahedra in Keggin structure. There is super exchange interaction between Mo(V) and Fe(III) through Mo (V)-O-Fe (III) bridge in Keggin structure.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1991年第5期473-476,共4页
Acta Chimica Sinica
