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Silicon monoxide is the chemical compound with the formula SiO where silicon is present in the oxidation state +2. In the vapour phase, it is a diatomic molecule. [ 1 ] It has been detected in stellar objects [ 2 ] and has been described as the most common oxide of silicon in the universe.
It is 180° in coesite (another polymorph of SiO 2), in Ph 3 Si–O–SiPh 3, [17] and in the [O 3 Si–O–SiO 3] 6− ion in thortveitite, Sc 2 Si 2 O 7. It increases progressively from 133° to 180° in Ln 2 Si 2 O 7 as the size and coordination number of the lanthanide decreases from neodymium to lutetium.
Suboxides are sometimes visible when certain metals are exposed to small amounts of O 2: 22 Cs + 3 O 2 → 2 Cs 11 O 3 4 Cs 11 O 3 + 5 O 2 → 22 Cs 2 O. Several suboxides of caesium and rubidium have been characterized by X-ray crystallography. As of 1997, the inventory includes the following Rb 9 O 2, Rb 6 O, Cs 11 O 3, Cs 4 O, Cs 7 O, Cs 11 ...
Dimethyldichlorosilane (Si(CH 3) 2 Cl 2) is a key precursor to cyclic (D 3, D 4, etc.) and linear siloxanes. [5] The main route to siloxane functional group is by hydrolysis of silicon chlorides: 2 R 3 Si−Cl + H 2 O → R 3 Si−O−SiR 3 + 2 HCl. The reaction proceeds via the initial formation of silanols (R 3 Si−OH): R 3 Si−Cl + H 2 O ...
Again there is variation in composition: magnesium silicide is represented by Mg 2 Si, [9] calcium silicide can be represented by Ca 2 Si, CaSi, CaSi 2, Ca 5 Si 3 and by Ca 14 Si 19, [10] strontium silicide can be represented by Sr 2 Si, SrSi 2 and Sr 5 Si 3 [11] and barium silicide can be represented by Ba 2 Si, BaSi 2, Ba 5 Si 3 and Ba 3 Si 4 ...
The SO molecule has a triplet ground state similar to O 2 and S 2, that is, each molecule has two unpaired electrons. [2] The S−O bond length of 148.1 pm is similar to that found in lower sulfur oxides (e.g. S 8 O, S−O = 148 pm) but is longer than the S−O bond in gaseous S 2 O (146 pm), SO 2 (143.1 pm) and SO 3 (142 pm).
[3] [4] The parameters of the cubic phase are listed in the infobox. The rhombohedral phase is produced at high temperatures and pressures or when using non-equilibrium growth methods. [5] It has a space group R 3 c No. 167, Pearson symbol hR30, a = 0.5487 nm, b = 0.5487 nm, c = 1.4510 nm, Z = 6 and calculated density 7.31 g/cm 3. [6]
VO is a non-stoichiometric compound, its composition varying from VO 0.8 to VO 1.3. [2] Diatomic VO is one of the molecules found in the spectrum of relatively cool M-type stars. [3] A potential use of vanadium(II) monoxide is as a molecular vapor in synthetic chemical reagents in low-temperature matrices. [4]