5,7-Dibromo-8-hydroxyquinoline

According to "Tiangong Kaiwu", sulfur is the "essence of two fires", which is widely used in the world. The main use of 5% 2C7 - two fires - 8 - sulfur is really related to people's livelihood and all kinds of industries.
Sulfur is often used in the field of medicine. In ancient times, doctors knew that sulfur-based heat can be used as medicine. It can warm and nourish the kidneys and has a good effect on some diseases of deficiency and cold. For example, the Compendium of Materia Medica also has relevant records. Sulfur can treat impotence, foot cold, deficiency and diarrhea and other diseases. In the processing of medicine, sulfur is often used as an auxiliary material to help medicinal materials play a better medicinal effect, and has made great contributions to saving people's lives and healing diseases.
In alchemy, sulfur is also an important thing. Ancient alchemists pursued the art of immortality. During the process of alchemy, sulfur participated in many chemical reactions due to its special chemical properties. Although alchemy ultimately failed to achieve the wish of immortality, during this process, people gained a better understanding of the properties of sulfur and other substances, which objectively promoted the development of ancient chemistry.
Furthermore, sulfur also has a place in agricultural production. It can be used to make pesticides to control pests and diseases. For example, sprinkling sulfur powder on farmland can inhibit the growth of some pathogens in the soil and protect the roots of crops. In fruit tree cultivation, sulfur can be used to whiten fruit trees, which can not only prevent pests, but also keep fruit trees warm, help agriculture harvest, and ensure food and clothing for the people.
In addition, in industrial production, especially in the manufacture of gunpowder, sulfur is even more indispensable. Gunpowder is made of saltpeter, sulfur, and charcoal mixed in a certain proportion. Sulfur is in gunpowder, which can help gunpowder burn more violently. Gunpowder is widely used in the military, changing the pattern of war; in the folk, gunpowder is used to make fireworks, adding a festive atmosphere during festivals.
To sum up, 5% 2C7 - secondary fire - 8 - sulfur has a wide range of uses, whether it is medicine, alchemy, agriculture or industry. It has an important role and deeply affects the production and life of the ancient people.

Rhenium diboride (ReB ²) is a material with unique physical properties. This material has shown important uses in the field of modern science and technology, and its properties are related to many aspects.
From the perspective of mechanical properties, rhenium diboride has high hardness and strength. Due to its stable bonding between atoms in its crystal structure, it endows the material with good deformation resistance. This property makes rhenium diboride have advantages in the manufacture of cutting tools, wear-resistant parts, etc., which can maintain its shape and properties for a long time and prolong its service life.
In terms of thermal properties, rhenium diboride has excellent thermal conductivity. Its atomic structure is conducive to efficient heat transfer, making this material very useful in the field of heat dissipation. For example, in electronic devices, it can be used as a heat sink material to quickly dissipate heat and prevent equipment from being damaged or degraded due to overheating.
Electrical properties, rhenium diboride exhibits a certain degree of conductivity. Although its electrical conductivity is different from that of typical metal conductors, it can be used in specific electronic devices, such as as as a special electrode material, providing a unique path for electron transmission.
In addition, rhenium diboride also has good chemical stability. In many chemical environments, it is not easy to chemically react with other substances, and can maintain its own structure and performance stability. This makes it suitable for manufacturing corrosion-resistant chemical equipment parts, ensuring that the equipment operates normally under harsh chemical conditions. In conclusion, rhenium diboride plays an indispensable role in the field of materials science and engineering due to its unique physical properties, laying the foundation for the development of many advanced technologies.

The chemical properties of 5% 2C7 + -dicyano-8 -naphthyl benzoic acid light are as follows:
This compound contains a dicyano group and a structural part of naphthyl benzoic acid, and its chemical properties are synergistically affected by these groups.
As far as dicyano is concerned, cyano has strong electron-absorbing properties. It can enhance molecular polarity, change intermolecular forces, and affect the melting point, boiling point and solubility of compounds. Under specific reaction conditions, cyano can undergo hydrolysis and be converted into carboxyl groups; it can also participate in nucleophilic addition reactions, such as reagents with active hydrogen.
Naphthyl benzoic acid part, the naphthalene ring is a fused ring aromatic hydrocarbon, which has certain stability and conjugation system. The conjugated structure gives the compound unique optical properties, which can absorb photoinduced electron transitions at specific wavelengths, so that the compound has light absorption and fluorescence characteristics, which may have applications in the field of optoelectronic devices. The carboxyl group in the benzoic acid structure is acidic and can neutralize with bases to form carboxylic salts; it can also participate in esterification reactions and form ester compounds with alcohols under the action of catalysts.
In addition, the 5% 2C7-dicyano-8-naphthyl benzoic acid molecule as a whole may cause luminescent chemical reactions under light due to the interaction of different groups in the structure, such as photoisomerization, photolysis, etc. The specific reactions depend on the wavelength, intensity and reaction environment of the light. These chemical properties make it useful in organic synthesis, materials science, and especially in the field of optical functional materials, or as a key intermediate or functional material.

"Tiangong Kaiwu" contains the method of making lead and mercury square fire with two (nitrate) seven coins, sulfur two coins, and flame nitrate eight coins, which is quite exquisite.
If you want to make this device, prepare all the materials first and match them in precise proportions. The second one is strong in nature and can help with the power of ignition and explosion. You need to be careful when picking it up. The quantity must be accurate to seven coins, and there must be no error at all. Sulfur is also an essential item. Its quality is better. The scale takes two coins. This amount is related to the change of the heat, and there is a slight deviation, or it will fall short. Flame nitrate eight coins is the source of fire. Its material selection needs to be high-quality, and its color is clean before it can be used.
Prepare the materials and mix them together. In a quiet and undisturbed place, place the materials in a clean container, stir slowly and mix slowly to ensure a uniform. When mixing, especially avoid fireworks to prevent unexpected changes.
After that, use a special mold to hold the mixed materials. The shape of the mold varies according to the device, whether it is square or round, it needs to be smooth and regular. After the material is put into the mold, tap and vibrate it to make it tight and free of pores.
Place it in a kiln for calcination, and the control of the heat is the key. At first, the heat is slowly dried, so that the moisture in the material gradually dissipates, and then the fire attacks, urging its chemical reaction. The method of observing the heat depends on the change in the color of the fire in the kiln, the color is red and bright, and the heat is suitable; the color is dark and stagnant, and the heat is not enough; the color is white and swaying, and the heat is too much.
After the calcination is completed, it cools down and comes out. Be careful when demoulding, at this time the lead-mercury square firearm is formed. However, it is necessary to check carefully, observe its shape, and check its quality. If there is any defect, it should be prepared according to the previous method. In this way, it can be used.

It is also known as the square bead of the Eight Rim Gui. This vessel is used to pay attention to things like a bead, and it cannot be ignored.
Its materials are excellent, so that it can be rubbed by the moon, and the frost can not be used. Use the bead, the first thing to do is to check whether it is in good condition. The bead is made, or there is a slight flaw, if it has not been inspected, I am afraid that it will be used. If it has cracks or broken beads, it must not be used. It needs to be repaired properly first, so that it can be used with peace of mind.
Furthermore, put the bead, and seek peace. The shape of this vessel is neat, but the place where the heart is, must not be ignored. If it is placed on an oblique place, or collided by external forces, it is easy to overturn. If the oil is not good enough, it will not damage the utensils themselves, or endanger the surrounding things. Therefore, it is the best policy to place the utensils in a flat and solid place.
When illuminating, it is especially necessary to be careful. The ointment used must be used. If the oil is not good, it will be smoked, which will not only reduce the quality of the utensils, but also reduce the effect of lighting. And when it is burned, be careful to prevent the ointment from coming out and causing fires. When operating, it is advisable to use utensils to slowly ignite the fire, and wait for it to burn.
It is also important to clear and protect the utensils. When using the utensils, it must be cleaned up as soon as possible. The grease is gathered, and it will not be beautiful for a long time. With a soft cloth, dip it in the cloth and measure the clean things, wipe the surface, and remove the dirt. Then wipe the cloth, but do not use force, for fear of damaging its paint surface or.
Daily collection is suitable for places where things are dry and tidy. The tide is high, and it is easy to make the utensils rot; in a dense place, it is not difficult to be empty, and it is also unfavorable for the utensils. Placed on a shelf, the height is appropriate, so it is easy to use it, and the other things are separated, so as not to collide with each other.
Where this is the case, use the attention of the two seven-eight-edge Gui square. The utensils are meager, and the care is taken, so that their effectiveness can be improved for a long time, and the antiquities can be delayed.