Eu(III) and Tb(III) Complexes with the Nonsteroidal Anti-Inflammatory Drug Carprofen: Synthesis, Crystal Structure, and Photophysical Properties

Two new lanthanide complexes with general formula [Ln₂(carprofen)₆­(DMF)₂] (Ln = Eu (<b>1</b>), Tb (<b>2</b>), DMF = <i>N</i>,<i>N</i>-dimethylformamide, carprofen = 6-chloro-α-methylcarbazole-2-acetic acid) have been synthesized by a hydrothermal method. Complex <b>1</b> was characterized by single-crystal X-ray diffraction (XRD), and it was found to crystallize in the monoclinic space group <i>C</i>2<i>/c</i>. The coordination of the ligand to the lanthanide ion has been investigated by Fourier-transform infrared (FTIR) spectra and ultraviolet–visible (UV–vis) absorption spectra. Complex <b>1</b> emits red light, but the antenna effect of the ligand is not effective, whereas complex <b>2</b> presents intense green emission with effective energy transfer from the ligand. The different performance of the two complexes is related to the energy matching between the excited states of the lanthanide ion and the triplet state of the ligand. The intramolecular energy transfer mechanisms are also discussed

Eu(III) and Tb(III) Complexes with the Nonsteroidal Anti-Inflammatory Drug Carprofen: Synthesis, Crystal Structure, and Photophysical Properties

Two new lanthanide complexes with general formula [Ln₂(carprofen)₆­(DMF)₂] (Ln = Eu (<b>1</b>), Tb (<b>2</b>), DMF = <i>N</i>,<i>N</i>-dimethylformamide, carprofen = 6-chloro-α-methylcarbazole-2-acetic acid) have been synthesized by a hydrothermal method. Complex <b>1</b> was characterized by single-crystal X-ray diffraction (XRD), and it was found to crystallize in the monoclinic space group <i>C</i>2<i>/c</i>. The coordination of the ligand to the lanthanide ion has been investigated by Fourier-transform infrared (FTIR) spectra and ultraviolet–visible (UV–vis) absorption spectra. Complex <b>1</b> emits red light, but the antenna effect of the ligand is not effective, whereas complex <b>2</b> presents intense green emission with effective energy transfer from the ligand. The different performance of the two complexes is related to the energy matching between the excited states of the lanthanide ion and the triplet state of the ligand. The intramolecular energy transfer mechanisms are also discussed

Molecular Dual-Rotators with Large Consecutive Emission Chromism for Visualized and High-Pressure Sensing

Low-cost, stable, highly sensitive, and easy-to-equip fluorescent high-pressure sensors are always attractive in both industrial and scientific communities. Organic emitting materials with pressure-dependent bathochromisms usually exhibit prominent mechanoluminescence, due to disturbance of intermolecular packing. This hinders their applications in stable and robust pressure sensing. In this work, we have developed a mechanically stable organic molecular pressure sensor, caused by intramolecular consecutive rotations by pressure, which exhibit large and eye-detectable emission bathochromism from yellow-green to red fluorescence and can be used for 0–15 GPa pressure sensing. The emission bathochromism shows good linear relationship with pressure, exhibiting a high linear coefficient of 9.1 nm/GPa. Moreover, this molecular sensor exhibits high thermal and mechanical stabilities, indicating good potentials for robust and outdoor applications