中文摘要：

在加热条件下,发现氯化铵可以使季戊四醇单侧修饰的Anderson型铬钼酸盐发生结构变异,Anderson型多酸母体上的季戊四醇配体由正中心位置异构到非正中心位置（季戊四醇配体的一个烷氧基从取代多酸骨架中的μ3-O桥氧原子异构为取代骨架中的μ2-O桥氧原子）,得到其χ同分异构体（NH4）3{χ-[Cr（OH）3Mo6O（18）（OCH2）3CCH2OH]},并通过电喷雾质谱ESI、红外光谱IR和单晶X射线衍射的方法确定了该化合物的结构.晶体测定及分析结果表明,该化合物属单斜晶系,P21/n空间群,晶胞参数a=1.053 68（4）nm,b=2.911 72（6）nm,c=1.124 70（7）nm,α=90°,β=117.45（6）°,γ=90°,Z=4,V=3.062 1（3）nm3.

英文摘要：

On heating,ammonium chloride can promote a structural transformation of the single-side pentaerythritol-modified Anderson-type chromohexamolybdate,（NH4）3{δ-[Cr（OH）3Mo6O（18）（OCH2）3 CCH2OH]},to form itsχisomer,（NH4）3{χ-[Cr（OH）3Mo6O（18）（OCH2）3 CCH2OH]},in which the pentaerythritol ligand on the Anderson polyoxometalate precursor isomerizes from the center position to a non-center position（One of its three alkoxy groups of the pentaerythritol ligand substitutes a μ2-O bridging oxygen atom instead of μ3-O bridging oxygen atom in commonδisomers）.The structure of theχisomer compound was determined by electrospray ionization mass spectrometry ESI,IR spectroscopy and single crystal X-ray diffraction technique.The results of crystal structure determination and analysis show that theχisomer compound is crystallized in monoclinic space group,P21/n,with unit cell parameter a=1.053 68（4）nm,b=2.911 72（6）,c=1.124 70（7）nm,α=90°,β=117.452（6）°,γ=90°,Z=4,V=3.062 1（3）nm~3.