Effect of Reaction Time on Lanthanide Borate Perrhenate Complexes.

Six new trivalent lanthanide borate perrhenate structures─the isostructural series Ln[B 8 O 11 (OH) 4 (H 2 O)(ReO 4 )] (Ln = Ce-Nd, Sm, Eu; 1 ) and La[B 6 O 9 (OH) 2 (H 2 O)(ReO 4 )] ( 2 )─have been prepared and structurally characterized. Single-crystal X-ray diffraction analysis reveals that both structures crystallize in the P 2 1 / n space group, contain 10-coordinated trivalent lanthanides in a capped triangular cupola geometry, are 3D borate framework materials, and contain either terminal ( 1 ) or bridging ( 2 ) perrhenate moieties. The presence or lack of a bridging perrhenate, along with the identity of the basal ligands, dictates how the layers are tethered together, ultimately leading to the different structures. Furthermore, the formation of 1 is sensitive to the reaction time employed. Herein, the synthesis, structural descriptions, and spectroscopy of these trivalent lanthanide perrhenate borate complexes are presented.