Chemical‐Bonding Assembly, Physical Characterization, and Photophysical Properties of Lanthanide Hybrids from a Functional Thiazole Bridge

Abstract

Two organic ligands derived from thiazole were modified by 3‐(triethoxysilyl)propyl isocyanate (TESPIC) to achieve the molecular precursors (P1 and P2). Then, the organic–inorganic hybrid materials (LnM1 and LnM2, Ln = Eu and Tb) were obtained by using these as bridging molecules to coordinate with lanthanide ions and form inorganic Si–O networks with tetraethoxysilane (TEOS) after cohydrolysis and copolycondensation processes, whose composition, microstructures, and photophysical properties were studied. All of the materials were amorphous and no phase separation occurred. The photoluminescence properties of these materials revealed that all these hybrids can show the characteristic luminescence of lanthanide ions. The ratios of red/orange, decay times, emission quantum efficiency of Eu3+ hybrid materials were also determined. Furthermore, the number of water molecules coordinated to the Eu3+ ion was theoretically estimated on the basis of emission spectra and the lifetime of the 5D0 state.

Synthesis and Pharmacological Evaluation of 1-Phenyl-3-Thiophenylurea Derivatives as Cannabinoid Type-1 Receptor Allosteric Modulators

“…As the Suzuki coupling between 2-bromo-5-nitrothiazole and phenylboronic acid failed to give the desired product 14 , a different route was sought to form the thiazole ring. Phenyl acetaldehyde was treated with bromine to give 2-bromo-2-phenylacetaldehyde, which underwent cyclization with thiourea to give the intermediate 44 . Coupling of 44 with 4-chlorophenyl isocyanate yielded 14 (Scheme ).…”

Metallic inorganic/organic hybrid system through functionalized Schiff-base linkage: Molecular assembly, characterization and luminescence

“…Our research team is presently engaged in the extensive work and we concentrate on covalently grafting the ligands to the inorganic networks in which lanthanide complexes luminescent centers, which are bonded with a siloxane matrix through Si-O linkage and we have successfully realized six paths to construct the functional silylated precursors. In addition, after the modification, we assembled the above modified bridge ligands with lanthanide ions and tetraethoxysilane (TEOS) to compose hybrid systems with covalent bonds and obtained series of stable and efficient molecular hybrid materials in optical areas [12][13][14][15][16][17][18].…”

Photofunctional hybrid silica microspheres covalently functionalized with metalloporphyrins

“…Up to now, most of the experimental studies on the optical properties of metalloporphyrins have been performed in the liquid phase, rather than in the solid state. The incorporation of the porphyrins and metalloporphyrins into solid inorganic substrates is of current interest and researches on immobilized porphyrins or metallic porphyrins on the inorganic matrix have been sprung up by entrapment [5,6], electrostatic binding or axial ligation of metal methods [7][8][9][10][11][12]. However, few studies about interaction of these two parts via covalent Si-C bonds have been performed [13][14][15].…”