摘要
对氨基苯磺酸(p-AbsH),邻菲咯啉(phen)与稀土硝酸盐在pH=6~7的水溶液中反应,合成了2个新颖的双U形单核配合物[Ln(O-p-Abs)2(phen)2(H2O)3](NO3).2H2O,其中Ln=La(1)和Ce(2)。X-射线单晶结构测定表明,2种晶体属异质同晶,正交晶系,Pccn空间群。在2个配合物中,Ln(Ⅲ)离子与5个O原子和4个N原子配位,形成1个畸变的三冠三棱柱体LnN4O5配位多面体,其中2个氧原子来自于2个对氨基苯磺酸根的磺酸基,另3个O原子则由配位水分子提供,4个N原子来自2个Phen。p-Abs与phen通过π-π作用构成具有手性的螺旋双U形结构,每个晶胞中含有2对构型相反的[Ln(O-p-Abs)2(phen)2(H2O)3]+,整个晶体呈外消旋,2种异构体分子间通过phen间的π-π作用构成超分子螺旋链,并通过氢键作用形成三维超分子结构。
Two mononuclear lanthanide (Ⅲ) complexes [Ln (O-p-Abs)2 (phen)2 (H2O)3]NO3.2H2O (Ln =La, Ce) were isolated from the aqueous reaction of p-aminobenzenesulfonilic acid (p-AbsH), 1,10-phenanthroline (phen) and Ln(NO3)3.6H2O, and characterized by elemental analysis, IR, UV, TG and single-crystal X-ray structure analysis. The two complexes are isostructural and crystallize in the orthorhombic system, space group Pccn with. the cell parameters: (1) a=1.751 56(15) nm, b=1.427 68(12) nm, c=1.670 62(15) nm, V=4.177 7(6) nm^3, Z=4, final R1= 0.0242 and wR2=0.056 5, and (2) a=1.749 90(18) nm, b=1.427 88(15) nm, c=1.67045(17) nm, V=4.173 9(7) nm^3, Z=4, final R1=0.021 9 and wR2=0.052 5, respectively. The Ln^3+ ion is in a LnN4O5 distorted tricapped trigonal prism coordination polyhedron completed by two O atoms from two p-Abs^- ligand, three O atoms from three coordinated water and four N atom from two phen ligands. A helix dual-U-shaped structure is formed through intramolecular π-π interactions between p-Abs and phen. There are four R- and S-[Ln(O-p-Abs)2(phen)2(H2O)3]^+ enantiomers in a ratio of 1:1 in a unit cell, making the crystals raeemic. The enantiomers are arranged into 1D supramolecular pseudo-helical chains via or-or interactions and then interacted through intermolecular hydrogen binds into a 3D supramolecular network.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2009年第2期249-255,共7页
Chinese Journal of Inorganic Chemistry
基金
福建省教育厅科技基金(No.JA08212)
福建省科技厅科技项目(No.2008F5053)资助
关键词
稀土配合物
晶体结构
对氨基苯磺酸
双U形
外消旋化合物
lanthanide complexes
crystal structure
p-aminobenzenesulfonilic acid
dual-U-shaped
racemic compound