| Abstract: 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) nm3, Z=4, final R1=0.024 2 and wR2=0.056 5, and (2) a=1.749 90(18) nm, b=1.427 88(15) nm, c=1.670 45(17) nm, V=4.173 9(7) nm3, Z=4, final R1=0.021 9 and wR2=0.052 5, respectively. The Ln3+ 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 racemic. The enantiomers are arranged into 1D supramolecular pseudo-helical chains via π-π interactions and then interacted through intermolecular hydrogen binds into a 3D supramolecular network. CCDC: 692565, 1; 692566, 2. |
