Three polynuclear lanthanide clusters: (NH4)2[Dy6Mo4O12(rac-L3−)4(OOCCH3)8]·4CH3OH·6H2O (I), (Et3NH)2[Dy6Mo4O12(rac-L3−)4(OOCCH3)8]·18H2O (II), and (Me4N)2[Dy6Mo4O12(rac-L3−)4(OOCCH3)8]·CH3OH·14H2O (III) (H3L = (E)-2-((2,3-dihydroxypropylimino)methyl)-phenol) were synthesized. Single-crystal analysis reveals that cluster I crystallized in the centrosymmetric space group (P42/n), while clusters II and II crystallized in the chiral space group (P3121 or P3221), and cluster I can be transformed into clusters II and III, when Et3NH+ and Me4N+, respectively, are used to replace NH4+. Investigation on the solid-state vibrational circular dichroism (VCD) spectra shows that the clusters II and III are homochiral crystallization. Powder X-ray diffraction study demonstrates that the transformation between chiral and achiral clusters is reversible.
三种多核
镧系元素团簇:(NH4)2[Dy6Mo4O12(rac-L3−)4(OOCCH3)8]·4CH3OH·6H2O (I), (Et3NH)2[Dy6Mo4O12(rac-L3−)4(OOCCH3)8]·18H2O (II),和 (Me4N)2[Dy6Mo4O12(rac-L3-)4(OOCCH3)8]-CH3OH-14H2O(III)(H3L = (E)-2-((2,3- 二羟基丙基亚
氨基)甲基)-
苯酚)的合成。单晶分析表明,簇Ⅰ在中心对称空间群(P42/n)中结晶,而簇Ⅱ和簇Ⅱ在手性空间群(P3121 或 P3221)中结晶,当分别用 Et3NH+ 和 Me4N+ 替代 NH4+ 时,簇Ⅰ可转化为簇Ⅱ和簇Ⅲ。对固态振动圆二色性光谱(
VCD)的研究表明,簇Ⅱ和簇Ⅲ是同手性结晶。粉末 X 射线衍射研究表明,手性簇和非手性簇之间的转化是可逆的。