A neodymium tetra(4-sulfonatophenyl)porphyrin with a flexible three-dimensional framework

Abstract

A novel neodymium porphyrin [Nd(TPPS)][Formula: see text]•[Formula: see text]H[Formula: see text]O (1) [H[Formula: see text]TPPS [Formula: see text] tetra(4-sulfonatophenyl)porphyrin] has been prepared through a solvothermal reaction and characterized by the X-ray single-crystal diffraction technique. Complex 1is crystallized in the [Formula: see text]4/mcc space group of the tetragonal system. Complex 1 features a three-dimensional (3D) open framework with the pore size of the channels being of 6.9 [Formula: see text] × 8.2 [Formula: see text]. A wide optical band gap of 4.98 eV is revealed by the solid-state UV/vis diffuse reflectance spectrum. The variable-temperature magnetic susceptibility obeys the Curie-Weiss law ([Formula: see text]/([Formula: see text] with [Formula: see text] 0.67 K and a negative Weiss constant [Formula: see text] -0.37 K as found by the magnetic measurements, suggesting the existence of an antiferromagnetic behavior. The N[Formula: see text] adsorption and desorption curves show good reversibility and verify that the 3-D framework is flexible and can be compressed with the increasing pressure.