What is C70 fullerene?
The discovery of fullerene C70 is a major breakthrough in the field of chemistry. It is a cage-shaped molecule composed of 70 carbon atoms, and its structure is similar to a football, so it is also called "football ene". Compared with fullerene C60, C70 has an additional five-membered ring in its structure, which makes its physical and chemical properties more unique. The C70 molecule has a high degree of symmetry and strong intermolecular forces, so it has good stability. At the same time, its unique cage structure also brings it excellent electron transport and optical properties.
According to the spherical hollow structure of the C70 fullerene molecule, it can be inferred that it should have aromaticity and be able to undergo reactions performed by general condensed ring aromatic hydrocarbons, such as alkylation and reduction to generate hydrides. It is well known that aromatic hydrocarbons generally show electron-rich reactions and are easy to undergo electrophilic substitution reactions with electrophiles, but C70 shows the reactivity of electron-deficient compounds, that is, it tends to obtain electrons. It is difficult to react with electrophiles, but easy to react with nucleophiles such as NH3 and metals. Bethune believes that the chemical behavior of C70 fullerene is more like an electron-deficient olefin than an aromatic compound. Due to the hollow spherical structure of C70, it can react on both the inner and outer surfaces of the sphere, from which various functional football ene derivatives are obtained.
Fullerene C70 has many special properties, including:
Strong antioxidant properties: Fullerene C70 can neutralize free radicals, resist cellular oxidative damage, and has anti-aging effects.
Good conductivity: C70 fullerene can be used as a semiconductor material in electronic devices and solar cells.
High strength and rigidity: Fullerene C70 has high strength and rigidity and can be used to enhance the performance of materials.
| Product name | C70 fullerene |
| CAS | 99685-96-8 |
| Molecular formula | C70 |
| Molecular weight | 720.64 |
| EINECS Number | 205-105-7 |
| Storage condition | Keep in dark place,Inert atmosphere,Room temperature |
| Melting point | >280 °C(lit.) |
| Water Solubility | Soluble in toluene. Insoluble in water. |
| Appearance | Dark brown to black powder |
| Boiling point | 500-600℃ subl. |
| Density | 5.568 |
What are the functions and applications of C70 Fullerene in skin care products?
1. C70 Fullerene can effectively scavenge free radicals, resist oxidative damage and help reduce ultraviolet damage.
2, Fullerene C70 can reduce the formation of melanin, whitening effect! But the long-term effect and specific mechanism are still unclear.
3. It can protect dermal collagen and I/IV fibers in the basal layer (the reduction of collagen and fibers is an important reason for the formation of wrinkles) and reduce the area of wrinkles.
4. It may be effective in reducing pores, and the research results are different. The main reason may be that the types of pores are different.
5. It has anti-inflammatory effect, and has a certain effect on acne, but the effect is worse than the anti-acne drugs currently used in clinic, so it can be used as an auxiliary nursing product for acne muscles.
6. Preliminary research shows that fullerene C70 can stimulate hair growth, which may be related to its antioxidant damage function.
7. It may also promote wound healing, and the specific mechanism and effect still need further study.
Product Specification
| Item | Specification | Results | |||
| Appearance | Black powder | Complies | |||
Identification |
Elemental analysis Appraisal:Positive Mass spectrum Appraisal:Positive Infrared spectrum Appraisal:Positive |
Complies Complies Complies |
|||
| Purity (HPLC) | 99.9% | 99.91% | |||
| Impurities | PAH/C50 | PAH/C50 | |||
| C60/Oxide | C60/Oxide | ||||
| C70 and C70 Oxide |
≤0.06% | C70 and C70 Oxide |
0.05978% | ||
| High Fullerenes |
≤0.04% | High Fullerenes |
0.03022% | ||
| Residual solvent | ≤100ppm | No data available | |||
| Conclusion Analyzed,this product complies with Enterprise Standard | |||||
| Storage | Store in tightly closed original container,protected from Light,in a dry place at low temperature(≤25℃ |
||||
| Shelf life | 3 years when properly stored | ||||
What are the main applications of fullerene C70?
Material Science: C70 Fullerene has excellent electron transport and optical properties, so it has a wide application prospect in the field of material science. For example, it can be used as an active layer material of high-performance organic solar cells to improve the conversion efficiency of solar cells. In addition, fullerene C70 can also be used to prepare conductive films, field effect transistors and other electronic devices, providing a new material choice for the development of electronic industry.
Biomedical field: Fullerene C70 also has potential application value in biomedical field. Because of its unique cage structure and excellent biocompatibility, it can be used as a drug carrier to wrap drug molecules in the cage structure to realize sustained release and targeted delivery of drugs. In addition, fullerene C70 has antioxidant and anti-inflammatory activities, and can be used to prepare antioxidants and anti-inflammatory drugs. Other fields: Fullerene C70 can also be used to prepare catalysts, sensors and other devices, showing broad application prospects in energy, environmental protection and other fields.
HTML5 atlas of C70 fullerene
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What are the preparation methods of fullerene C70?
The preparation of high-purity fullerenes in large quantities and at low cost is the basis of fullerene research. In order to increase the yield of fullerenes, researchers have continuously improved process technology, and various preparation methods have emerged. At present, the more mature and commonly used methods for preparing fullerenes are: arc graphite evaporation method, solar graphite evaporation method and flame combustion method.
1. Arc graphite evaporation method
Generally, the arc chamber is evacuated to a high vacuum, and then an inert gas such as helium is introduced. The cathode and anode for preparing fullerenes are placed in the arc chamber. The cathode material is usually a spectral grade graphite rod, and the anode material is generally a graphite rod. Usually, baht, nickel, copper or tungsten carbide are added to the anode electrode as a catalyst. When two high-purity graphite electrodes are close to each other for arc discharge, the carbon rod is gasified to form plasma. In an inert atmosphere, small carbon molecules collide, merge and close many times to form stable C60 and high-carbon fullerene molecules. They exist in a large amount of granular soot, deposited on the inner wall of the reactor, and the soot is collected for extraction. The arc graphite evaporation method does not produce toxic and harmful products for preparing fullerenes, but it is costly and very power-consuming. It is one of the commonly used methods for synthesizing fullerenes in the laboratory.
2. Solar graphite evaporation method
The solar evaporation method is a method of preparing fullerenes by directly evaporating graphite in a helium atmosphere using focused sunlight as a heating method. When the temperature reaches 3000K, the fullerene yield can reach 20%. The method of evaporating graphite using focused sunlight avoids the photochemical destruction of the fullerene structure by ultraviolet radiation, and prevents carbon vapor from condensing into carbon blocks before reaching the slow cooling zone, thereby increasing the yield of fullerenes and solving the problem of low yield of arc graphite evaporation and plasma graphite evaporation.
3. Flame combustion method
The combustion method is the main method for preparing fullerenes in industry. The flame combustion method mainly involves diluting the pre-mixed benzene, toluene vapor and oxygen with argon gas, and introducing them into a low-pressure (about 5.32kPa) combustion chamber for incomplete combustion to obtain soot containing C60 and C70. After separating and purifying the soot, C60 with a purity of 99.9% can be obtained. The energy required for fullerene generation in the flame combustion method is provided by the heat released by the combustion itself. By adjusting the pressure and gas ratio, the product distribution can be controlled over a large range. It has the advantages of simple operation, easy continuous feeding, and no power consumption. Therefore, this method has become the mainstream method for industrial production of fullerenes.
Structural characteristics of C70 Fullerene:
The cage structure of the C60 molecule resembles a football. The 32 faces include 12 five-membered rings and 20 six-membered rings. Each five-membered ring shares a common edge with 5 six-membered rings. Each six-membered ring is connected to 3 six-membered rings and 3 five-membered rings, that is, the six-membered rings separate the 12 five-membered rings from each other.
The shape of C70 is similar to a football. There are 12 five-membered rings and 25 six-membered rings in the molecule. Each five-membered ring also shares a common edge with 5 six-membered rings, that is, the six-membered rings separate the 12 five-membered rings from each other. In fact, so far, the molecules prepared are composed of 12 five-membered rings and different numbers of six-membered rings. Each five-membered ring shares a common edge with 5 six-membered rings, that is, the six-membered rings separate the 12 five-membered rings from each other.
Why is this so? This is because there is tension in the σ bond of the five-membered ring, while there is no tension in the σ bond of the six-membered ring. The connection between the five-membered ring and the five-membered ring increases the tension of the σ bond in the molecule and makes it unstable. Therefore, in the fullerene molecules currently prepared in the laboratory, the five-membered ring exists in isolation, that is, each five-membered ring is surrounded by six-membered rings. People call this phenomenon the "isolated five-membered ring principle" (that is, the five-membered ring in the fullerene molecule is connected to the six-membered ring as much as possible instead of the five-membered ring to keep the molecule stable). The smallest fullerene molecule that can meet the "isolated five-membered ring principle" is the C60 molecule.
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