Optical spectroscopy of neodymium(III) complexes with diethylenetriaminepentaacetic acid in solution and in [C(NH2)(3)](2)[Nd(dtpa)(H2O)]center dot 7H(2)O single crystal

The crystal structure of [C(NH2)(3)](2)[Nd(dtpa) (H2O)] . 7H(2)O (H(5)dtpa= diethylenetriaminepentaacetic acid) has been determined. Electronic absorp tion spectra of a single crystal of the [C(NH2)(3)](2)[Nd(dtpa) (H2O)] . 7H (2)O compound were measured at room and liquid helium temperatures. In orde r to investigate the formation and structure of Nd-III-dtpa species occurri ng in solution, the spectral results for the crystal were compared with tho se of the Nd-III-dtpa (1:1) complex in solution. The analysis of spectral p roperties of this system may be applied for solutions of coordination chemi stry problems encountered in lanthanide polyaminopolycarboxylates. (C) 2000 Elsevier Science Ltd All rights reserved.