Structural Elucidation of a Calcined Layered Lanthanide-Organic Framework Comprising an Unprecedented Organic Polymer

Abstract

The crystal structure of the two-dimensional layered material [La(L)] (where L (3-) stands for [-(PO3CH2)(2)(NH)(CH2PO2)(mu-O)(A1/2)-](3-)) was determined from single-crystal X-ray diffraction studies at the low temperature of 180(2) K. The material comprises a one-dimensional organic linker obtained from the condensation of individual residues of H(3)nmp(3-) present in the parent polymeric two-dimensional material [La(H(3)nmp)], at the high temperature of 340 A degrees C {where H(6)nmp stands for [N(CH2PO3H2)(3)]}. Previous structural investigations on this system were only achieved using poor-quality powder X-ray diffraction data leading to two possible models for the crystal structure of [La(L)]. This work unequivocally unveils the structural features of this material, describing in detail the connectivity within the layers and the formation of the unprecedented polymeric zigzag one-dimensional linker. The crystal structure of the two-dimensional layered material [La(L)] (where L (3-) stands for [-(PO3CH2)(2)(NH)(CH2PO2)O-A1/2-](3-)) was determined from single-crystal X-ray diffraction studies at the low temperature of 180(2) K and compared with the two possible models previously obtained using poor-quality powder X-ray diffraction data. Schematic representation of the crystal packing of the [La(L)] framework viewed in perspective along the [100] direction of the unit cell.