Crystal structure of two neodymium complexes with amino acids: {[Nd2(cystine)2(OH2)8](ClO4)6 · 3H2On} and [Nd2(phenylalanine)4(OH2)8](ClO4)6·H2O

Abstract

Abstract The title complexes: {[Nd2(Cys)2(OH2)8](ClO4)6·3H2O}n (1) and [Nd2(Phe)4(OH2)8](ClO4)6·H2O (2) were prepared in aqueous solutions (where Cyscystine, Phephenylalanine ), and their crystal structures were determined by X-ray diffraction methods. For complex 1, the crystal belongs to the orthorhombic space group P212121, with cell parameters: a13.674(3) A , b18.485(6) A , c19.334(7) A , V4887(3) A 3 , Z4 ; the final R value is 0.045; the crystal is built up from layer polymers; each neodymium ion is coordinated by four carboxylic oxygen atoms from four cystine molecules and four oxygen atoms from H2O, forming a coordination polyhedron of square antiprism. In the case of complex 2, the crystal belongs to the monoclinic space group C2/c, with unit cell parameters: a10.835(11) A , b22.27(2) A , c25.85(3) A , β93—10(8)°, V6227(10) A 3 , Z4 ; the final R value is 0.069. The complex 2 is a binuclear molecule in which four carboxylic oxygen atoms of phenylalanine ligands and four oxygen atoms of water molecules form a distorted square antiprism around each neodymium ion.