【摘要】 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。更多还原

【Abstract】 Crystal structures of [Ln2(CH2CHCOO)6·3H2O](Ln= Ce,Nd) were characterized by using X-ray single crystal analysis.The title compounds are iso-structural: monoclinic system,space group P21/c with a =1.02099(13) nm,b =1.52294(19) nm,c =2.0325(3) nm,β =100.838(2)°,V = 3.1039(7) nm3 for [Ce2(CH2CHCOO)6·3H2O];a =1.01978(8) nm,b =1.50979(12) nm,c =2.02712(16) nm,β =100.881(1)°,V =3.0650(4) nm3 for [Nd2(CH2CHCOO)6·3H2O].There are two independent Ln ions in the asymmetric unit,which are located in nona-coordinated and deca-coordinated environments respectively.The two Ln ions are bridged together by two μ2-oxygen atoms of two independent acrylates,resulting in left-handed and right-handed helical chains.Hydrogen network are built up from helical chains and water molecules located between two neighbor chains,giving rise to three-dimensional stack.更多还原