Tf2O-Mediated Tandem Reaction of Enaminones for the Synthesis of Functionalized Conjugated-Enals/ß-Naphthalaldehydes.

A highly efficient and regioselective method for constructing functionalized conjugated enals via the Tf2O-mediated tandem reaction of enaminones with thiophenols has been described. Chain products with excellent stereoselectivity could be obtained through substrate regulation. Additionally, a feasible method for synthesizing ß-naphthalaldehydes through PhSO2Na/DABCO promoting hydrogen atom transfer process has also been reported here. Mechanism studies have shown that 2-formyl vinyl triflate 8 and sulfonylated enal 9 were the key intermediates in this process.

Hydrogen bonding and phase separation cooperatively guide the self-assembly of U60 and the polymer to fabricate multiscale nanostructures.

U60 (Li44K16[UO2(O2)(OH)]60, U60) and polymers are directionally enriched on the polymer surface by hydrogen bonding. In this study, we used several different polymers and U60 for self-assembly. The morphology and non-covalent interaction between core-shell nanocomplexes were studied by electron microscopy and vibration spectroscopy. Under the synergistic action of hydrogen bonding and nanometer phase separation, block copolymers and U60 formed different structures of core-shell nanocomposites. At a low concentration of U60, spherical nanocomposites with frozen structures were formed, at a high concentration of U60, stable worm-like structures, and micelles were formed. We used block copolymers to absorb U60, and after one month, about 96% of U60 could be removed from the solution. Because of uranium toxicity and long half-life, storage and transportation are important for the environment and public health. This study may open the door for further development of novel and efficient polymer self-assembly materials to adsorb and remove nuclear pollution in the environment.

Fluorescent Properties of Manganese Halide Benzothiazole Inorganic-Organic Hybrids.

The reaction of manganese (II) halides MnX2 and benzothiazole (btz) in the concentrated acids HX (X = Cl, Br) at 80 °C resulted in the formation of two inorganic-organic hybrid complexes: [(btz)2(MnX4)]·2H2O (X = Cl, 1; X = Br, 2). Both compounds showed green luminescence and exhibited moderate quantum yields of 43.17 % for 1 and 26.18 % for 2, which were directly originated from the tetrahedral coordination of Mn2+ ion. Two organic - inorganic hybrids [(btz)2(MnX4)]·2H2O based on MnCl2, benzothiazole and halide acids emitted green light with the moderate quantum efficiencies when excited by 365 nm light. Graphical abstract Two organic-inorganic hybrids [(btz)2(MnX4)]·2H2O based on MnCl2, benzothiazole and halide acids emitted green light with the moderate quantum efficiencies when excited by 365 nm light.

Structural phase transitions of a layered organic-inorganic hybrid compound: tetra(cyclopentylammonium) decachlorotricadmate(II), [C5H9NH3]4Cd3Cl10.

A layered organic-inorganic hybrid compound, tetra(cyclopentylammonium) decachlorotricadmate(II) (1), in which the two-dimensional [Cd3Cl10](4-)n networks built up from three face-sharing CdCl6 octahedra are separated by cyclopentylammonium cation bilayers, has been discovered as a new phase transition material. It undergoes two successive structural phase transitions, at 197.3 and 321.6 K, which were confirmed by differential scanning calorimetry measurements, variable-temperature structural analyses, and dielectric measurements. The crystal structures of 1 determined at 93, 298, and 343 K are solved in P212121, Pbca, and Cmca, respectively. A precise analysis of the structural differences between these three structures reveals that the origin of the phase transition at 197.3 K is ascribed to the order-disorder transition of the cyclopentylammonium cations, while the phase transition at 321.6 K originates from the distortion of the two-dimensional [Cd3Cl10](4-)n network.