Solubilizing Red Phosphorus via Alkali Metal Reagents
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Solution Overview
Problem
Current methods for producing polyphosphides from red phosphorus are limited by the difficulty in solubilizing red phosphorus and the use of toxic and flammable materials, which restricts the scalability and exploration of solution-based routes, leading to a need for alternative methods to access soluble and reactive polyphosphide species.
Innovation Solution
Red phosphorus is solubilized using an alkali metal alkoxy compound or alkali metal alkyl thiolate compound in an organic solvent, such as potassium ethoxide in a mixture of tetrahydrofuran and dimethoxyethane, under reflux or in a packed column method, to produce soluble polyphosphide anions, allowing for their isolation and further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct solid-state reactions between metals and red phosphorus are used, then polyphosphides can be obtained, but the products are insoluble in common organic solvents and exhibit very high chemical stability
Solution Approach 1:
The patent changes the reaction parameters by transitioning from solid-state to solution-phase chemistry, using organic solvents and varying temperature/pressure conditions to obtain polyphosphides with different solubility and reactivity characteristics
Solution Approach 2:
The patent introduces organic solvents and potentially organic reagents as intermediaries to facilitate the reaction between metals and red phosphorus, enabling the formation of soluble polyphosphide species that can be further processed
2Ease of manufacture
If solution-based methods are used to obtain polyphosphide fragments, then soluble and reactive species can be accessed, but the use of toxic and flammable materials (such as white phosphorus and cryogenic solvents) limits scalability
Solution Approach 1:
The patent replaces toxic and flammable reagents (white phosphorus, cryogenic solvents) with safer, more environmentally friendly alternatives that are easier to handle and scale up, even if the reaction conditions are more stringent
Solution Approach 2:
The patent employs inert atmosphere techniques to safely handle red phosphorus and prevent unwanted side reactions, creating a safer working environment that facilitates scaling up while maintaining the benefits of solution-based methods
3Object-affected harmful factors
If red phosphorus is used instead of white phosphorus, then toxic and flammable materials are avoided, but the difficulty in solubilizing red phosphorus restricts the exploration of solution-based routes
Solution Approach 1:
The patent performs preliminary actions to prepare red phosphorus for solution-based reactions, such as activation treatments or pre-complexation with ligands, to overcome its inherent insolubility and enable subsequent reactions under milder conditions
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
This method enables the production of soluble polyphosphides under mild conditions, facilitating their isolation and potential use in high-performance materials and applications, such as 2D semiconductors and lithium-ion battery anodes, while avoiding the use of toxic substances.
Implementation Method 1
Red phosphorus is solubilized by subjecting red phosphorus or a composition of black phosphorus and red phosphorus to an alkali metal alkoxy compound or alkali metal alkyl thiolate compound suspended in an organic solvent, to produce polyphosphide anions soluble in organic solvents
Implementation Method 2
The red phosphorus and alkali metal or alkali metal compound are reacted via reflux or an in-line packed column method
Data Source
AI summary
A method of generating soluble polyphosphides using solution chemistry is presented. A reaction between an alkali metal alkoxy compound or alkali metal alkyl thiolate compound and shelf stable red phosphorus generated soluble polyphosphides in a variety of organic solvents with the 31P NMR spectrum being used to detect the species of polyphosphides produced.