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3-Decylthiophene is a structurally unique organic compound whose molecule consists of a thiophene ring connected to a straight-chain decyl alkyl group at the 3-position. This design ingeniously combines the properties of a conductive aromatic ring with those of a flexible long-chain alkyl group.
At the forefront of materials science, it transcends the role of a mere intermediate to become a key functional building block for constructing ordered self-assembled structures: its long alkyl chain confers excellent solubility and drives strong intermolecular van der Waals forces, while the thiophene head group provides π-π stacking capability. Their synergistic interaction enables spontaneous formation of highly ordered layered liquid crystal phases or self-assembled monolayers, offering an ideal platform for interface engineering in organic electronic devices.
In organic semiconductors, serving as a monomer for regular polymers (e.g., synthetic P3DT), its decyl side chains effectively modulate interchain spacing and crystallinity, playing a pivotal role in balancing charge mobility and solution processability. Additionally, the molecule itself can serve as a semiconductor layer in organic field-effect transistors or as a templating agent to guide the oriented arrangement of conjugated molecules. In sensing applications, its amphiphilic molecular structure enables the construction of supramolecular sensing interfaces that selectively respond to specific analytes. These interdisciplinary applications highlight the exceptional value of 3-N-DECYLTHIOPHENE as a molecular tool bridging microscopic chemical structures with macroscopic material functions.
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C.F |
C14H24S |
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E.M |
224 |
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M.W |
224 |
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m/z |
224 (100.0%), 225 (15.1%), 226 (4.5%), 226 (1.1%) |
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E.A |
C, 74.93; H, 10.78; S, 14.29 |
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3-decylthiophene is a thiophene derivative with long-chain alkane substituents, and its unique properties are determined by the thiophene ring and long-chain alkane substituents in its molecular structure. It has good solubility and film-forming properties, and can be easily dissolved in various organic solvents, making it convenient for processing and preparing thin films. In addition, it also has excellent optoelectronic properties, such as high carrier mobility, good light absorption and emission performance, making it have broad application prospects in the field of optoelectronics.
1. Organic solar cells
Organic solar cells are optoelectronic devices that use organic semiconductor materials to convert solar energy into electrical energy. As a type of organic semiconductor material, efficient charge separation and transfer can be achieved by co constructing an active layer with other organic semiconductor materials, such as fullerene derivatives. In organic solar cells, it is usually used as a donor material to form a heterojunction structure with the acceptor material, thereby improving the photoelectric conversion efficiency.
Specific examples:
Researchers have constructed efficient organic solar cells by synthesizing blends of poly P3DT and fullerene derivatives such as PCBM. By optimizing the proportion of the blend and the device structure, a high photoelectric conversion efficiency has been achieved. For example, the photoelectric conversion efficiency of organic solar cells constructed using P3DT: PCBM blends can reach over 5%. In addition, by introducing other functional materials such as interface modification layers, electron transport layers, etc., the performance of the device can be further improved.
2. Organic field-effect transistors
Organic field-effect transistors (OFETs) are electronic control switching devices constructed using organic semiconductor materials, which have advantages such as low power consumption, high integration, and bendability. As a channel material for OFETs, high carrier mobility and switching ratio can be achieved by regulating their molecular structure and arrangement.
Specific examples:
Researchers have constructed high-performance OFETs by synthesizing poly P3DT derivatives with specific structures and optimizing their thin film preparation processes. By regulating the molecular weight, chain length, morphology, and crystallinity of the polymer, the carrier mobility and switching ratio of OFETs can be significantly improved. For example, OFETs constructed using poly P3DT derivatives with excellent crystalline properties can achieve carrier mobility of over 1 cm ²/Vs and a switching ratio of over 10 ^ 6.
3. Organic light-emitting diodes
Organic light-emitting diodes (OLEDs) are optoelectronic devices that use organic semiconductor materials to emit light, with advantages such as high brightness, rich color, and bendability. P3DT and its derivatives can be used as luminescent or electron transport layer materials for OLEDs. By regulating their molecular structure and luminescent properties, efficient electroluminescence can be achieved.
Specific examples:
Researchers have synthesized poly (3-decylthiophene) derivatives with excellent luminescent properties, optimized their thin film preparation process and device structure, and constructed efficient OLEDs. By adjusting parameters such as the emission wavelength, emission efficiency, and stability of polymers, OLEDs with high brightness, high color purity, and long lifespan can be achieved. For example, OLEDs constructed using poly (P3DT) derivatives with excellent luminescent properties can achieve a brightness of tens of thousands of nits, a color purity of over 90%, and a lifespan of over tens of thousands of hours.
4. Organic photodetector
Organic photodetector is a photoelectric device that uses organic semiconductor materials to detect and convert optical signals, with advantages such as fast response speed, high sensitivity, and bendability. P3DT and its derivatives can be used as photosensitive materials for organic photodetectors. By regulating their molecular structure and light absorption properties, efficient light signal detection and conversion can be achieved.
Specific examples:
Researchers have synthesized poly (P3DT) derivatives with excellent light absorption properties, optimized their thin film preparation process and device structure, and constructed efficient organic photodetectors. By adjusting parameters such as the light absorption wavelength, light absorption efficiency, and response speed of polymers, high sensitivity, fast response, and low noise organic photodetectors can be achieved. For example, organic photodetectors constructed using poly (P3DT) derivatives with excellent light absorption properties can achieve a sensitivity of over 1 A/W, a response speed of microseconds, and a noise level below 10 ^ -12 A/√ Hz.
5. Organic laser devices
Organic laser devices are optoelectronic devices that use organic semiconductor materials to generate laser light, with advantages such as small size, light weight, and integrability. P3DT and its derivatives can be used as gain media materials for organic laser devices. By regulating their molecular structure and luminescent properties, efficient laser generation and amplification can be achieved.
Specific examples:
Researchers have synthesized poly (P3DT) derivatives with excellent luminescent and gain properties, and optimized their thin film preparation process and device structure to construct efficient organic laser devices. By adjusting parameters such as the emission wavelength, emission efficiency, and gain coefficient of polymers, organic laser devices with low threshold, high power, and high stability can be achieved. For example, organic laser devices constructed using poly (P3DT) derivatives with excellent luminescence and gain properties can achieve threshold powers of several milliwatts or less, output powers of hundreds of milliwatts or more, and stability of thousands of hours or more.
The following is a brief introduction to the two laboratory synthesis methods of P3DT and their corresponding chemical equations:
Method 1: Grignard reaction method
This method utilizes Grignard reagent to react with corresponding haloalkanes to generate intermediates, which are then treated with statin base and further reacted to obtain 3 Decylthiophene.
The first step is to prepare Grignard reagent:
React Decylmagnesium bromide with magnesium particles in a dry environment to produce Decylmagnesium bromide.
C10H21Br+Mg → C10H21MgBr
Step 2, Grignard reaction with butanone anthracene as substrate:
Add the generated bromodecylmagnesium solution dropwise to the butanone anthracene substrate and react under appropriate conditions to form an intermediate.
C10H21MgBr+C12H9O → C10H21C12H8OMgBr
Step 3, statin alkali treatment:
Add the intermediate to the statin base solution and undergo statin base treatment to generate an alcoholate.
C10H21C12H8OMgBr+H2O → C10H22C12H8OH+MgBrOH
Step 4, further reaction:
The alcoholate undergoes dehydration, deoxidation, and other reactions under appropriate conditions to produce the final product.
C10H22C12H8OH → C10H21C4H9S
Method 2: Condensation reaction method
This method utilizes the condensation reaction of aromatic aldehydes and ethyl thioacetate to generate intermediate products, which are then reduced to obtain 3 Decylthiophene.
Step 1, condensation reaction:
Condensation reaction of aromatic aldehydes (such as benzaldehyde) with ethyl thioacetate under alkaline conditions to form intermediates.
C6H5CHO+C4H8OS → C6H5CH=COSMe
Step 2, intramolecular alkylation reaction:
Under appropriate conditions, the intermediate undergoes intramolecular alkylation reaction to generate 4-alcohol etherate.
C6H5CH=COSMe → C6H5CH (OEt) COSMe
Step 3, Restore:
Reduce the 4-alcohol etherate to convert it into 4-hexanol ether.
C6H5CH (OEt) COSMe+LiAlH4 → C6H5CH (OH) COSMe
Step 4, further reaction:
Under appropriate conditions, 4-hexanol ether undergoes dehydration, deoxidation, and other reactions to produce the final product 3 Decylthiophene.
C6H5CH (OH) COSMe → C10H21C4H9S
The preparation of 3-N-DECYLTHIOPHENE was as follows: 1.2mol of magnesium metal and 1.2mol of 1-bromodectane were mixed in a 100% 2-methyltetrahydrofuran solvent, and 300mg of (1,3-bis (diphenylphosphine) propane) nickel dichloride (II) catalyst was present. The concentration of Grignard reagent in the solvent is 2.6mol/L. Then, add 3-bromothiophene (1 equivalent) to the flask. React at room temperature. Immediate gas chromatography analysis of the reaction products showed 27.1% of 3-bromothiophene, 30.0% of 3 decylthiophene, and 0.9% of dithiophene based byproducts. After 1 hour, the GC showed 0.0% of 3-bromothiophene, 92.6% of 3 decylthiophene, and 2.3% of dithiophene based byproducts. After 2.5 hours, GC showed 0.0% of 3-bromothiophene, 94.6% of 3 decylthiophene, and 1.9% of dithiophene based byproducts.
Thiobenzene is a five membered heterocyclic compound composed of carbon and sulfur atoms.
In 1883, Victor Meyer first isolated and identified this compound from coal tar. Due to its aromaticity and high chemical stability, thiophene and its derivatives have attracted much attention in the fields of pharmaceuticals, dyes, and materials science.
In the mid-20th century, with the development of organic synthetic chemistry, scientists began to systematically study alkyl substituted derivatives of thiols to regulate their electronic structure and solubility. Among them, 3-alkylthiophene has become a research hotspot due to its key role in conductive polymers. As a representative molecule of long-chain alkyl substitution, 3-ethylthiophene (3-DT) has played an important role in the development of polythiophene materials.
In the 1950s, organic chemists began studying the electrophilic substitution reaction of thiophene and found that its substitution activity was higher at the 3rd (β) position.
In 1962, American chemists Gronowitz et al. reported the Friedel Crafts alkylation reaction of thiophene and successfully synthesized various 3-alkylthiophenes, such as 3-methylthiophene and 3-ethylthiophene. However, introducing long-chain alkyl groups (such as dealkylation C10H21) faces challenges: spatial hindrance effects lead to low reaction yields, and side effects (such as dealkylation and cyclization) are difficult to control.
In 1975, Japanese chemists Yamamoto et al. successfully synthesized 3-decylthiophene using metal organic catalysis (such as N-butyllithium/halogenated alkanes), and confirmed its structure through nuclear magnetic resonance (NMR) and mass spectrometry (MS). The advantage of this method lies in its high regioselectivity (mainly generating 3-substituted products) and scalability (applicable to the propylene propylene alkyl chain), laying the foundation for subsequent research on polystyrene (3-alkylthio hydrocarbons).
In 1980, Japanese scientists Shirakawa, American scientists McDiarmid, and Higgs were awarded the Nobel Prize in Chemistry for their discovery of the conductivity of polyacetylene, sparking a research boom in yoke polymers.
In 1982, American chemist Wudl et al. first reported the electrochemical polymerization of thiophene, but its solubility was poor and difficult to handle.
In 1986, French scientist Ganier proposed that alkyl substitution technology could enhance the solubility of polythiophene and synthesized poly (3-methylthiophene) (P3MT).
In 1990, Canadian scientist Leclerc discovered that long-chain alkyl groups (such as deprotonation) can significantly improve the processability of polythiophene solutions. P3DT has high solubility in organic solvents (such as chloroform and toluene), and after annealing, it can form high-order thin films and improve carrier mobility. This discovery makes P3DT an ideal material for organic field-effect transistors (OFETs).
3-N-DECYLTHIOPHENE demonstrates the synergistic effect between molecular design and functional materials science. Its role in organic electronics, from OFETs to OPVs, has been fully demonstrated through decades of research, while emerging applications in sensing, drug delivery, and self-healing materials highlight its multifunctionality. Future progress depends on solving synthesis problems, improving stability, and adopting sustainable practices. With the development of this field, 3-N-DECYLTHIOPHENE will continue to be an important cornerstone of the next generation of intelligent, adaptive, and environmentally friendly technologies.
Frequently Asked Questions
Q: How does the steric hindrance difference between 3-N-DECYLTHIOPHENE and 2-alkyl substituted thiophene affect the regioselectivity of monomer polymerization?
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A: The substitution of long-chain alkyl groups at 3 positions will result in unilateral steric hindrance, leading to the preferential occurrence of C2-C5 coupling during polymerization, significantly reducing the defect of disordered coupling at the β position; 2-Alkylthiophenes are prone to random bonding. The hydrophobic stretching conformation of the decyl long carbon chain also pre regulates the molecular arrangement, making it a niche preferred monomer for preparing low defect polythiophene derivatives, rather than short alkyl thiophenes.
Q: What are the obscure advantages of the physicochemical properties of 3-N-DECYLTHIOPHENE, which is liquid at room temperature, in wet processing of organic semiconductors?
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A: Most short chain 3-alkylthiophenes are solid at room temperature and require solvent heating for dissolution; The long alkyl chain of 3-decylthiophene enhances lipid solubility and low-temperature fluidity. Pure substances at room temperature can form liquid films without the need for highly toxic aromatic hydrocarbons, reducing carrier traps caused by solvent residue in thin films. It is suitable for low-temperature non-destructive preparation of flexible devices and belongs to a niche green processing monomer.
Q: How does the carbon chain length of the side chain decyl group change the molecular stacking and π - π stacking distance of 3-N-DECYLTHIOPHENE?
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A: Compared to substituted thiophenes with hexyl and octyl groups, decyl long side chains increase the hydrophobic isolation layer between molecular layers, slightly widening the π - π stacking spacing, but at the same time inducing stronger ordered arrangement of layered near crystalline phases; Macroscopically, the anisotropy of the thin film is enhanced, the lateral charge mobility is stable, and the vertical conduction is weakened. This anisotropic regulation law is often overlooked.
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