Дихлордифенилсилан

Description

Dichlorodiphenylsilane is a difunctional arylchlorosilane: the silicon atom has two phenyl groups and two chlorine atoms. Refers to the basic monomers of organosilicon synthesis, widely used as raw materials for silicone resins and as a reagent for introducing a diphenylsilylene group into organic and organoelement molecules. It differs from alkyl chlorosilanes in the higher thermal stability of the polymers obtained on its basis due to the rigidity of the aromatic rings with silicon.

Basic Attributes

• CAS No.: 80-10-4 (also found as No. 155684-38-1)
• Chemical formula: C12H10Cl2Si
• Synonyms: Diphenyldichlorosilane, 1,1'-(Dichlorosilylene)bis[benzene], TSL 8062, NSC 77110, Diphenylsilicon dichloride, diphenylsilyl dichloride
• Molecular Weight: 253.197
• Exact weight: 253.20

Physico-chemical characteristics

The initial dump ends at the molecular and exact mass; there are no further numerical parameters in it. According to independent sources (Sigma-Aldrich, ChemicalBook - information was searched separately because the dump is empty): boiling point 304–305 °C, melting point −22 °C, density 1.22 g/cm3 at 20 °C, flash point 157 °C. This combination of high boiling point and moderate density is typical of diphenyl-substituted chlorosilanes: two aromatic rings significantly increase the boiling point compared to alkyl analogues of comparable molecular weight.

Scope of application

It is used as a cross-linking and structure-forming monomer in the production of silicone oils and resins, raw materials for the production of organosilicon varnishes and sealants. Serves as a surface modifier - a precursor for the production of materials based on silicon dioxide, increases the impact resistance, durability and abrasion resistance of coatings. In the electronics industry, it is used in the synthesis of base materials for blue phosphorescent organic light-emitting diode (OLED) devices, where the rigidity of the diphenylsilyl moiety helps stabilize the energy levels of the material. As an intermediate product of organic synthesis, it is used in the production of pharmaceutical substances, agrochemicals and dyes, and also as a reagent for the production of diphenylsilanediol and polydiphenylsiloxane resins with increased heat resistance.

Chemical nature

Both chlorine atoms at the silicon atom are hydrolytically labile and are successively replaced by hydroxyl groups upon contact with moisture, first forming chlorosilanol and then diphenylsilanediol; subsequent polycondensation gives linear and cyclic diphenylsiloxane structures. Two bulky phenyl substituents sterically slow down hydrolysis compared to alkyldichlorosilanes, which gives the technologist more time for controlled dosing of the reagent.

Storage and transportation conditions

Hydrolytically unstable, it reacts with water and air moisture to release hydrogen chloride, therefore it is stored in an airtight container in a dry, cool, ventilated room away from water, alcohols and bases. When working, wear gloves, eye and respiratory protection, and local exhaust equipment. In case of spillage, do not wash off with water without prior neutralization, collect with a dry sorbent and dispose of as halogen-containing waste.