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采用X射线单晶衍射法,解析了[Ln2(CH2CHCOO)6·3H2O]·3H2O(Ln=Ce;Nd)的结构。结果表明标题化合物属同构:属单斜晶系(空间群P2(1)/c);[Ce2(CH2CHCOO)6·3H2O]·3H2O晶胞参数a=1.02099(13)nm,b=1.52294(19)nm,c=2.0325(3)nm,β=100.838(2)°,V=3.1039(7)nm3;[Nd2(CH2CHCOO)6·3H2O]·3H2O晶胞参数a=1.01978(8)nm,b=1.50979(12)nm,c=2.02712(16)nm,β=100.881(1)°,V=3.0650(4)nm3。化合物不对称结构单元中含有两个独立的稀土中心离子,分别处九、十配位环境中。两个稀土离子由两个独立的丙烯酸μ2-氧桥联形成左手和右手螺旋链。螺旋链通过链间的水分子形成氢键网络,堆垛成三维结构。
The structure of [Ln2 (CH2CHCOO) 6 · 3H2O] · 3H2O (Ln = Ce; Nd) was analyzed by single crystal X-ray diffraction. The results show that the title compound is isomorphic: belongs to monoclinic system (space group P2 (1) / c); [Ce2 (CH2CHCOO) 6 · 3H2O] · 3H2O unit cell parameters a = 1.02099 (13) nm, b = 1.52294 (8) nm, c = 2.0325 (3) nm, β = 100.838 (2) °, V = 3.1039 (7) nm3; [Nd2 (CH2CHCOO) b = 1.50979 (12) nm, c = 2.02712 (16) nm, β = 100.881 (1) °, V = 3.0650 (4) nm3. Asymmetric structure unit contains two independent rare earth ions, respectively, nine, ten coordination environment. Two rare earth ions are bridged by two separate acrylic μ 2 -oxies to form left-handed and right-handed helices. Helical chain through the chain of water molecules to form hydrogen bond network, stacked into three-dimensional structure.