Synthesis and structure of mono- and polynuclear Cu(II) complexes with α-(N-benzoxazolin-2-one)acetic acid

Abstract

Two compounds with the α-(N-benzoxazolin-2-one)acetic acid ligand (L) were synthesized: [Cu(L)2(NH2C2H4OH)2] (I) and [Cu(L)2(H2O)2]n (II), viz., mono- and polynuclear complexes, respectively. According to X-ray diffraction data (CIF files CCDC no. 1008795 (I) and 1008794 (II)), the coordination polyhedron of the metal atom in I is an extended tetragonal bipyramid with four heteroatoms of two monoethanolamine molecules in the equatorial plane. The carboxyl oxygen atoms of two ligands L occupy the apical positions. In complex II, a tetragonal bipyramid is also formed, having two O atoms of the carboxyl groups of the L molecule and two water O atoms in the equatorial plane. Two oxygen atoms of the carboxyl groups of the L molecule occupy apical positions. Complex II is a 2D polymer (polymerization involves four O atoms of the carboxyl group) with the [CuL2(H2O)2] unit.