A Tandem Catalysis for Isoindolinone Synthesis over Single-Atom Pd/TiO Catalyst.

Developing an efficient strategy to replace the conventional synthesis method for producing isoindolinone (IIO) scaffold, a crucial structural motif for constructing pharmaceutical molecules, remains to be a great challenge. Herein, a single-atom Pd/TiO tandem catalysis has been developed for the IIO scaffold synthesis by using readily available phthalic anhydride (PA), ammonia, and H. The single-atom Pd/TiO catalyst demonstrates superior catalytic performance, achieving a PA conversion of 99 %, an IIO selectivity of 91 %, and a turnover frequency (TOF) up to 4807 h.

Selective Upcycling of Polyethylene Terephthalate towards High-valued Oxygenated Chemical Methyl p-Methyl Benzoate using a Cu/ZrO Catalyst.

Upgrading of polyethylene terephthalate (PET) waste into valuable oxygenated molecules is a fascinating process, yet it remains challenging. Herein, we developed a two-step strategy involving methanolysis of PET to dimethyl terephthalate (DMT), followed by hydrogenation of DMT to produce the high-valued chemical methyl p-methyl benzoate (MMB) using a fixed-bed reactor and a Cu/ZrO catalyst. Interestingly, we discovered the phase structure of ZrO significantly regulates the selectivity of products.

LiZnGeS: a promising diamond-like infrared nonlinear optical material with high laser damage threshold and outstanding second-harmonic generation response.

Herein, a promising infrared nonlinear optical (IR NLO) material, Li2ZnGeS4, was successfully synthesized in the typical quaternary diamond-like semiconductor (DLS) system. This material exhibits excellent performances including a wide band gap (3.49 eV), a high laser-damage threshold (LDT, 8 × benchmark AgGaS2), and a good NLO effect (0.

Adjustable optical nonlinearity in d cations containing chalcogenides via dp hybridization interaction.

The introduction of d10-metal cations is of importance in the design of infrared nonlinear optical materials. The role of d10-metal cations on the band gap and the second-harmonic generation (SHG) effect as well as the structure-property relationship were investigated in the Li2MGeS4 (M = Cd, Hg) and AB2S4 (A = Cd, Hg; B = Al, Ga) systems by using the first-principles calculations. The results show that the decreased band gap is related to a higher valence band maximum (VBM) caused by the larger dp repulsion from the Hg-5d orbitals and a downshift in the conduction band minimum (CBM) due to the lower energy of the Hg-6s orbitals.

Two Lanthanide Borate Chlorides LnBO(OH)Cl (Ln = La, Ce) with Wide Ultraviolet Transmission Windows and Large Second-Harmonic Generation Responses.

Two borate chlorides LaBO(OH)Cl and CeBO(OH)Cl have been synthesized and characterized. Both of them exhibit structure similar to that of notable KBeBOF and feature two-dimensional [BO(OH)] layers constructed by [BO(OH)] fundamental building blocks. Thermal analyses, infrared spectroscopy, UV-vis-NIR spectra, and second harmonic generation measurement were performed to investigate their physical properties.