Trimethylplatinum(IV) Iodide Synthesis With High Purity and Yield
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Solution Overview
Problem
Existing methods for producing trimethylplatinum(IV) iodide are labor-intensive, costly, and yield unsatisfactory results with varying product quality and purity, often requiring large excesses of methylation reagents and leading to difficult-to-remove impurities.
Innovation Solution
A method involving the reaction of platinum compounds with methyl Grignard compounds and iodomethane in a specific aprotic polar solvent mixture, using a balanced molar ratio and controlled conditions to achieve high purity and yield, minimizing impurities such as magnesium, sodium, and elemental iodine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large excess of Grignard reagent and iodomethane is used, then product purity is improved, but atom economy and cost worsen
Solution Approach 1:
The patent optimizes the molar ratios of reactants to be close to stoichiometric (Pt:MeMgI:MeI = 1:2:2 or 1:3:3) rather than using large excesses, while improving purity through controlled reaction conditions including temperature management (-78°C to room temperature), inert atmosphere, and sequential addition of reagents. This resolves the contradiction by achieving high purity without excessive material consumption.
2Manufacturing precision
If three-stage synthesis route is used, then product purity is improved, but labor intensity and cost worsen
Solution Approach 1:
The patent combines multiple synthesis steps into a one-pot reaction where platinum compound, Grignard reagent, and iodomethane react sequentially in the same reaction vessel without isolating intermediates. This merges the multi-stage process into a single operation, reducing labor intensity and time while maintaining high purity through controlled reaction conditions and in-situ purification.
Solution Approach 2:
The patent performs preliminary preparation of reagents under inert atmosphere and pre-cooling to -78°C before initiating the reaction sequence. This preliminary action prevents side reactions and ensures high purity while streamlining the overall process by eliminating the need for intermediate purification steps.
3Reliability
If Grignard reagent is used in large excess, then reaction completeness is improved, but yield and product quality worsen
Solution Approach 1:
The patent maintains continuous reaction conditions by keeping the system under inert atmosphere throughout, with controlled temperature progression and continuous stirring. This ensures complete reaction without forming impurities that would compromise product quality, achieving both reaction completeness and high product quality.
Solution Approach 2:
The patent uses monitoring of reaction progress (via color change from yellow to colorless, and TLC analysis) to determine when the reaction is complete. This feedback mechanism ensures optimal reaction completion without excessive reagent use, maintaining both reliability and product quality.
4Manufacturing precision
If complex purification steps are used, then product purity is improved, but productivity and time efficiency worsen
Solution Approach 1:
The patent extracts and removes inorganic salts (MgCl2, MgI2, NaCl, KCl) formed during the reaction by filtration and washing with water and organic solvents. This targeted extraction removes impurities efficiently without requiring complex multi-step purification procedures, maintaining high purity while improving productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces trimethylplatinum(IV) iodide with high purity and good yields, suitable for industrial scale, while reducing the formation of difficult-to-separate by-products, and meeting the requirements for catalysts and precursors in chemical vapor deposition processes.
Implementation Method 1
reacting at least one platinum compound with a methyl Grignard compound MeMgX and iodomethane
Implementation Method 2
reacting at least one platinum compound with a methyl Grignard compound MeMgX and iodomethane to form trimethylplatinum(IV) iodide
Implementation Method 3
in an aprotic polar solvent SA comprising an ether SE and a halogenated hydrocarbon SH
Data Source
AI summary
The invention relates to a method for producing trimethylplatinum(IV) iodide and trimethylplatinum(IV) iodide obtainable according to said method and the use thereof as a reactant for producing platinum(IV) compounds, as a precatalyst and as a catalyst. The platinum(IV) compounds thus obtainable, as well as the use thereof as precursors for the deposition of platinum layers and platinum-containing layers on a surface of a substrate are also the subject matter of the invention. The invention also relates to a substrate comprising a platinum layer or a platinum-containing layer on a surface, and to a method for producing an electronic component, in particular an electronic semiconductor component, or an electrode for a fuel cell using a platinum(IV) compound obtainable using trimethylplatinum(IV) iodide, which is obtainable by means of the method described herein.