Add time:07/31/2019         Source:sciencedirect.com

Four lanthanide metal (Dy, Ho, Er, Yb) complexes with diethylenetriamine-N,N,N′,N″,N″-pentaacetic acid (H5dtpa) have been prepared and characterized by using their infrared absorption spectra and thermal analyses. The crystal and molecular structures of (NH4)2[M(dtpa)]·4H2O (M: Dy, Ho, Er, Yb) were determined by a single-crystal X-ray diffraction method. The crystals of these complexes were iso-morphous to each other: monoclinic, space group P1̄, Z=2. The central metal atom is nine-coordinated, in a tricapped trigonal prism geometry, to three N and five O atoms of dtpa5−, and a carboxylato oxygen atom from an adjacent complex ion, resulting in the formation of a binuclear structure. These six M–O and three M–N bond lengths increase with the lengthening of the radius of the metal ion.

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