Spin Transition Material Color Tuning via Anion Segmentation
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Solution Overview
Problem
Existing spin transition compounds for information storage and thermochromic applications have a limited range of color variations, typically changing between pink or white colors with temperature, lacking adjustability and hysteresis.
Innovation Solution
A novel material composed of an iron complex with a 1,2,4-triazole ligand and a combination of coloring and noncoloring anions, allowing for reversible spin state changes and adjustable color transitions between different colors, including the use of specific anions like azo and anthraquinone derivatives to control the spin transition and color variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional spin transition compounds are used, then the spin transition function is achieved, but the color variation range is limited
Solution Approach 1:
The patent applies composite materials by combining multiple anion types (coloring and non-coloring) within a single spin transition compound structure. This creates a composite anionic system where coloring anions (such as azo or anthraquinone derivatives) provide diverse color variations while non-coloring anions maintain the spin transition functionality, thereby expanding the color variation range without compromising the spin transition effect
Solution Approach 2:
The patent applies local quality by assigning different functional roles to different anions within the compound. Coloring anions are strategically selected to provide specific color characteristics at particular positions in the compound structure, while non-coloring anions occupy other positions to maintain structural integrity and spin transition properties. This localized functional differentiation enables precise control over color variations while preserving the core spin transition functionality
2Adaptability or versatility
If conventional spin transition compounds are used, then the spin transition occurs, but the transition temperature and hysteresis are not adjustable
Solution Approach 1:
The patent applies parameter changes by systematically varying the selection and combination of anions to adjust the spin transition temperature and hysteresis characteristics. By changing the chemical nature, size, and electronic properties of the anions (particularly the coloring anions like azo or anthraquinone derivatives), the patent achieves precise control over transition temperature and hysteresis width without fundamentally altering the core spin transition mechanism, thereby enabling adjustable parameters while maintaining reasonable structural complexity
3Adaptability or versatility
If coloring anions are added to expand color range, then color variation is improved, but the compound structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the anion system into distinct functional categories: coloring anions (such as azo or anthraquinone derivatives) that provide color variation, and non-coloring anions that maintain structural stability and spin transition properties. This segmentation allows for independent optimization of each anion type's function, enabling color adjustment capability while managing the complexity of the overall anion combination through systematic classification and selection
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 material achieves rapid and adjustable color changes with temperature, offering a wide range of color variations and the ability to adjust the transition temperature and hysteresis, making it suitable for advanced thermochromic applications and data storage.
Implementation Method 1
the compound undergoes a spin transition between a low spin (LS) state and a high spin (HS) state with a change in color associated with each change in spin state
Implementation Method 2
rapid and adjustable color changes with temperature
Implementation Method 3
the ability to adjust the transition temperature and hysteresis
Data Source
AI summary
A material is composed of at least one spin transition compound that corresponds to the formula Fe1-mMm(R-Trz)3XbYc (I) in which M is a metal having a 3d4, 3d5, 3d6 or 3d7 configuration, other than Fe; 0≦m≦1; R-Trz represents a 1,2,4-triazole ligand carrying an R substituent on the nitrogen in the 4 position; R is an alkyl group or an R1R2N— group in which R1 and R2 represent, each independently of the other, H or an alkyl radical; X represents at least one noncoloring monovalent or divalent anion; Y represents at least one anion which has a coloring group; and b and c are chosen so that the electrical neutrality of the compound (I) is adhered to. A process for the preparation of this material and to its use as thermochromic pigment, as support for data storage or as optical limiter.