Trimethylplatinum(IV) Iodide Synthesis with Controlled Stoichiometry
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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 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 an aprotic polar solvent mixture of ether and halogenated hydrocarbon, using a molar ratio of 1:4:4 to 1:6:6, allows for high-purity trimethylplatinum(IV) iodide production with reduced by-product formation and easy separation of impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large excess of Grignard reagent and iodomethane is used, then yield of trimethylplatinum(IV) iodide is improved, but product purity deteriorates due to difficult-to-remove impurities
Solution Approach 1:
The patent changes the molar ratio parameters from the conventional large excess (1:4.2 to 1:11) to a precise stoichiometric ratio (1:4 to 1:6 for Pt:Grignard, with iodomethane added). This parameter optimization maintains high yield while minimizing impurity formation, resolving the contradiction between productivity and manufacturing precision
Solution Approach 2:
Iodomethane is introduced as an intermediary reagent that facilitates the methylation reaction while allowing for better control of stoichiometry. The addition of iodomethane to the reaction of platinum compounds with Grignard reagent enables high yield without requiring large excess of Grignard reagent, thus maintaining product purity
2Reliability
If large excess of reagents is used, then reaction completeness is improved, but loss of substance increases due to waste of expensive reagents
Solution Approach 1:
The patent optimizes the molar ratio parameters to precise values (Pt:Grignard = 1:4 to 1:6, with iodomethane added) instead of using large excess. This parameter optimization ensures reaction completeness while minimizing reagent waste, directly addressing the contradiction between reliability and loss of substance
Solution Approach 2:
Instead of using large excess of reagents, the patent employs partial action with precisely controlled stoichiometric amounts. The reaction is driven to completeness through optimized conditions and the addition of iodomethane rather than through reagent excess, reducing substance loss while maintaining reliability
3Manufacturing precision
If three-stage synthesis route is used, then product purity is improved, but loss of time and manufacturing complexity increase
Solution Approach 1:
The patent merges multiple synthesis steps into a single one-pot reaction. The platinum compound, Grignard reagent, and iodomethane are combined and reacted simultaneously in one vessel, eliminating the need for separate isolation and purification steps while maintaining high product purity, thus resolving the contradiction between manufacturing precision and loss of time
Solution Approach 2:
The reactants are prepared and combined in advance with optimized stoichiometry, allowing the reaction to proceed directly to high-purity product without intermediate isolation steps. This preliminary preparation enables a streamlined one-pot synthesis that reduces time loss while maintaining purity
4Manufacturing precision
If complex purification steps are used, then product purity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts or removes the need for complex purification steps by optimizing the reaction to produce high-purity product directly. The simplified workup involves only basic filtration and solvent removal, eliminating the need for recrystallization, chromatography, or other complex purification techniques, thus resolving the contradiction between manufacturing precision and device complexity
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 achieves high yield and purity of trimethylplatinum(IV) iodide, substantially free of magnesium, sodium, and elemental iodine impurities, suitable for industrial-scale applications and meeting catalyst and precursor requirements.
Implementation Method 1
reacting at least one platinum compound selected from the group consisting of platinum(II) compounds and platinum(IV) compounds, with at least one methyl Grignard compound according to the general formula MeMgX
Implementation Method 2
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.