Metal–N-saccharide chemistry: synthesis and structure determination of two Cu(II) complexes containing glycosylamines

Two new complexes [Cu(N,N′,N″-(d-Glc)3-tren)Cl]Cl (1) and [Cu(N,N′,N″-(maltose)-tren)]Cl2·H2O (2), have been synthesized and characterized by elementary analysis, and the IR and UV spectra suggest that complex 1 and complex 2 are arranged in trigonal bipyramidal configuration and square-pyramidal configuration, respectively. The crystal structure of complex 1 has been determined by X-ray diffraction as: a=9.3476(8), b=17.4236(13), c=9.7836(8) Å, β=91.197(3)°, V=1593.1(2) Å3, Z=2, and R=0.0325, which shows that three secondary amine groups (N-1, N-2, N-3) of the glycosylamine ligand forms the equatorial plane, and the tertiary amine (N-4) and one Cl− are located at the apical positions.