4 results about "Rhodium salt" patented technology

The invention discloses a method for preparing a chiral benzhydrol compound through asymmetric hydrogenation of o-amido benzophenone under catalysis of rhodium. The chiral rhodium catalyst is generated in situ from a metal rhodium salt and a chiral phosphine-phosphoramidite ligand in various solvents. Compared with other methods for synthesizing chiral benzhydrol, the method has the characteristics of cheap catalyst, easiness in preparation of chiral ligand, mild reaction conditions, simplicity and convenience in operation, high yield, high enantioselectivity and the like, and can be applied to large-scale preparation of chiral benzhydrol compounds. The method is also suitable for efficient preparation of the rice plant growth regulation inhibitor (S)-Inabenide, the yield can reach 92%, the enantioselectivity can reach 96%, and the method has good industrial application prospects.

This invention discloses a multicolor fluorine magnetic resonance imaging probe based on a metal-organic cage. First, a rhodium-based metal-organic cage is formed by the self-assembly of a fluorinated isophthalic acid ligand and a rhodium salt, covalently introducing the first characteristic fluorine signal. Then, leveraging the coordination ability of the rhodium nodes in the rhodium-based metal-organic cage, it coordinates with a fluorinated pyridine derivative, introducing a second characteristic fluorine signal. This results in a multicolor probe containing both fluorine signals within the metal-organic cage, ensuring that all signals exhibit completely consistent pharmacokinetic behavior in vivo. This achieves true multi-channel synchronous imaging, solving the fundamental problem of spatiotemporal asynchrony of mixed probe signals. The probe system of this invention features precise structure, strong design flexibility, high imaging sensitivity, and multicolor imaging capabilities, providing a new solution for existing fluorine probes with single-channel imaging or complex structures. It also provides a new tool for in vivo multi-target biological imaging and dynamic monitoring.

This invention discloses a methanol-to-ethanol catalyst, its preparation method, and its applications, comprising: a composition satisfying the chemical formula: Cu a Zn b Rh g Co l Fe μ Ca h Al ρ O c / C 100 The atomic ratios of the elements in the formula are: a = 5.5–14, b = 0.5–1, g = (4–5) × 10. ‑5 The parameters are: l = 0.2–0.3, μ = 0.2–0.3, h = 0.002–0.003, ρ = 0.002–0.003, and c is the number of oxygen atoms required to satisfy the valence of each element. The preparation process involves mixing the prepared asphalt-based activated carbon powder and amorphous hydroxyl iron oxide powder with basic zinc carbonate powder, then impregnating them with an equal volume of a mixed solution of copper, cobalt, and rhodium salts. After drying, the mixture is kneaded and shaped with a high-alumina cement molding agent. In the continuous reaction process of methanol conversion to ethanol, this catalyst exhibits good diffusion performance, conversion activity, product selectivity, and high operational stability.

The present invention relates to a plating solution for forming a black rhodium plating film. The black rhodium plating solution according to the present invention comprises a rhodium salt with a metallic rhodium concentration of 1 g / L or more and 20 g / L or less, sulfuric acid with a concentration of 10 mL / L or more and 100 mL / L or less, a phosphonic acid derivative or its salt with a concentration of 2 mM or more and 100 mM or less, and a magnesium salt with a metallic magnesium concentration of 0.1 g / L or more and 10 g / L or less. In the present invention, the phosphonic acid derivative or its salt acts as a blackening agent for the rhodium plating film. By means of this blackening agent, a black rhodium plating film with minimal change in appearance even after formation can be obtained.