作者:Zhong-Sheng Cai、Norihisa Hoshino、Song-Song Bao、Jiage Jia、Tomoyuki Akutagawa、Li-Min Zheng
DOI:10.1002/chem.201801301
日期:2018.9.12
distinct dynamic motion of the organic groups in compounds 1 and 2. The fluctuation of the polar MeO groups in these two compounds is confirmed by dielectric relaxation measurements. In contrast, the fluctuation of polar groups in compounds 3 and 4 is not evident. Interestingly, the dehydrated samples of 3 and 4 (i.e., 3‐de and 4‐de) exhibit one‐step and two‐step phase transitions associated with the motion
通过将极性甲氧基引入苯基或苄基膦酸酯配体中,获得了具有层状结构的四种膦酸钴,即[Co(4-mopp)(H 2 O)](1),[Co(4-mobp) (H 2 O)](2),[Co(3-mopp)(H 2 O)](3)和[Co(3-mobp)(H 2 O)](4),其中4或3 -moppH 2是(4-或3-甲氧基苯基)膦酸,4-或3-mobpH 2是(4-或3-甲氧基苄基)膦酸。化合物1,2,和4结晶在极性空间群Pmn的2 1或Pna 2 1,而化合物3在中心对称空间群P 2 1 / n中结晶。四个结构中的层拓扑相似,可以看作钙钛矿型,其中边缘共享[Co 4 O 4 ]菱形被PO 3 C基团覆盖。化合物中的苯基和基团的MeO 1 - 3的严重紊乱,而在4是有序的。基于296和123 K数据的结构比较显示化合物1和2中有机基团的独特动态运动。通过介电弛豫测量证实了这两种化合物中极性MeO基团的