Anionic Imide Material Room Temperature Ferromagnetism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic magnets have low ferromagnetic Curie temperatures, typically not exceeding 36 K, and synthesizing pure organic magnets with ferromagnetism at room temperature without metals remains a significant challenge.
Innovation Solution
An anionic imide material is developed, comprising reduced imide compound anions with specific electron-withdrawing groups, which are prepared through reduction in a solvent using hydrazine hydrate or electrochemical reduction, resulting in a ferromagnetic material with a Curie temperature above room temperature and high coercive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional organic magnets are used, then the material is organic and can be processed, but the ferromagnetic Curie temperature is low (not higher than 36 K)
Solution Approach 1:
The patent changes the chemical parameters of the organic molecule by introducing specific structural features: imide groups with strong electron-withdrawing capabilities, conjugated pi-electron systems, and heavy atom effects. These parameter changes in molecular structure lead to enhanced spin-orbit coupling and exchange interactions, raising the Curie temperature from below 36 K to above room temperature (300 K).
Solution Approach 2:
The patent creates a composite magnetic system by combining organic imide molecules with metal ions or radical species. The imide anions serve as ligands that coordinate with metal centers or host unpaired electrons, forming a composite structure that exhibits ferromagnetism at elevated temperatures while maintaining organic material processability.
2Ease of manufacture
If pure organic magnets without metals are synthesized, then the material is environmentally friendly and processable, but achieving room temperature ferromagnetism remains a significant challenge
Solution Approach 1:
The patent modifies molecular parameters by designing imide compounds with extended conjugation, specific substituent groups, and optimized molecular geometries. These changes enhance intermolecular interactions and magnetic coupling, enabling room temperature ferromagnetism in pure organic systems without requiring metal components.
Solution Approach 2:
The imide functional group acts as an intermediary that facilitates magnetic coupling between organic molecules. The imide anions with unpaired electrons serve as mediators that enable ferromagnetic interactions to propagate through the organic framework, achieving room temperature stability without metals.
3Reliability
If inorganic magnetic materials with transition metals or rare earth elements are used, then strong ferromagnetism is achieved, but the material is not organic and has limited processability
Solution Approach 1:
The patent extracts the essential magnetic functionality (unpaired electrons and exchange interactions) from traditional inorganic magnetic materials and transfers it to an organic molecular framework. By taking out the metal components and replacing them with organic imide structures that possess unpaired electrons, the invention achieves ferromagnetism in a purely organic system with enhanced processability and versatility.
Solution Approach 2:
The patent substitutes the inorganic metal-based magnetic mechanism with an organic molecular mechanism. Instead of relying on transition metal d-orbitals or rare earth f-orbitals, the invention uses organic pi-electron systems and imide group electrons to generate and sustain ferromagnetic order, enabling processing and application advantages of organic materials.
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 anionic imide material exhibits ferromagnetism at room temperature with a Curie temperature of 400 K and coercive force of 200 Oe, enabling the creation of high-performance pure organic magnetic devices with broad application prospects.
Implementation Method 1
reducing the imide compound to an anion; the solution or the suspension of the imide compound is prepared by the following method: mixing the imide compound with hydrazine hydrate for reduction to obtain the solution or the suspension of the anionic imide compound
Implementation Method 2
The anionic imide material is ferromagnetic at room temperature and may be used for organic magnetic materials and preparing organic magnetic device; The anionic imide material exhibits ferromagnetism at room temperature with a Curie temperature of 400 K
Data Source
AI summary
The anionic imide material is obtained by preparing a solution or a suspension of an imide compound, then reducing and drying the same; the anionic material comprises anions of an imide compound, the anions being at least one selected from the following formula I or formula II; in formula I or II: n=1, 2, or 3; R1, R2 are respectively selected from at least one of H, amino, carboxyl, hydroxy, thiol, and pyridyl groups; X1-X4 are respectively an electron withdrawing group, and specifically selected from one of H, F, Cl, Br, CN, and NO2 groups. The anionic material of the present invention has a Curie temperature larger than room temperature and ferromagnetism, and is an organic magnetic material; it may be used for preparing an organic magnetic material and/or an organic magnetic device.