Back دکامتیل‌سیکلوپنتاسیلوکسان AZB Dekamethylcyklopentasiloxan Czech Decamethylcyclopentasiloxan German Δεκαμεθυλοκυκλοπεντασιλοξάνιο Greek Dekametilziklopentasiloxano Basque دکامتیل‌سیکلوپنتاسیلوکسان Persian Dekametyylisyklopentasiloksaani Finnish Cyclométicone French Decamethylcyclopentasiloxaan Dutch Декаметилциклопентасилоксан Russian

Decamethylcyclopentasiloxane

Not to be confused with sitocalciferol.
Decamethylcyclopentasiloxane
Skeletal formula of decamethylcyclopentasiloxane
Ball-and-stick model of the decamethylcyclopentasiloxane molecule
Ball-and-stick model of the molecule as found in the crystal structure determined by single-crystal X-ray diffraction[1]
Sample of decamethylcyclopentasiloxane
Names
Preferred IUPAC name
Decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane
Other names
  • Cyclopentamethicone
  • Cyclic dimethylsiloxane pentamer
  • D5
  • D5
  • 2,2,4,4,6,6,8,8,10,10-Decamethylcyclopentasiloxane
Identifiers
3D model (JSmol)
1800166
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.007.969 Edit this at Wikidata
EC Number
  • 208-764-9
MeSH Decamethylcyclopentasiloxane
RTECS number
  • GY5945200
UNII
  • InChI=1S/C10H30O5Si5/c1-16(2)11-17(3,4)13-19(7,8)15-20(9,10)14-18(5,6)12-16/h1-10H3 checkY
    Key: XMSXQFUHVRWGNA-UHFFFAOYSA-N checkY
  • InChI=1/C10H30O5Si5/c1-16(2)11-17(3,4)13-19(7,8)15-20(9,10)14-18(5,6)12-16/h1-10H3
    Key: XMSXQFUHVRWGNA-UHFFFAOYAC
  • C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1
  • O1[Si](O[Si](O[Si](O[Si](O[Si]1(C)C)(C)C)(C)C)(C)C)(C)C
Properties
[(CH3)2SiO]5
Molar mass 370.770 g·mol−1
Appearance Colourless liquid
Density 0.958 g/cm3
Melting point −47 °C; −53 °F; 226 K
Boiling point 210 °C (410 °F; 483 K)
17.03±0.72 ppb (23 °C) [2]
log P 8.07[3]
Vapor pressure 20.4±1.1 Pa (25 °C) [4]
Viscosity 3.74 cP
Hazards
GHS labelling:
GHS02: FlammableGHS08: Health hazard
Warning
H226, H361, H412, H413
P201, P202, P210, P233, P240, P241, P242, P243, P273, P280, P281, P303+P361+P353, P308+P313, P370+P378, P403+P235, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuelInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
2
0
Flash point 73 °C (163 °F; 346 K)
Safety data sheet (SDS) External MSDS
Related compounds
Octamethylcyclotetrasiloxane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Decamethylcyclopentasiloxane, also known as D5 and D5, is an organosilicon compound with the formula [(CH3)2SiO]5. It is a colorless and odorless liquid that is slightly volatile.[5]

  1. ^ S. Parsons, D. Rankin, P. A. Wood (2004). "CSD Communication YAGTOQ: decamethylpentasilsesquioxane". Cambridge Structural Database: Access Structures. Cambridge Crystallographic Data Centre. doi:10.5517/cc89wzd. Retrieved 2021-08-18.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  2. ^ Sudarsanan Varaprath; Cecil L. Frye; Jerry Hamelink (1996). "Aqueous solubility of permethylsiloxanes (silicones)". Environmental Toxicology and Chemistry. 15 (8): 1263–1265. Bibcode:1996EnvTC..15.1263V. doi:10.1002/etc.5620150803.
  3. ^ Shihe Xu, Bruce Kropscott (2012). "Method for Simultaneous Determination of Partition Coefficients for Cyclic Volatile Methylsiloxanes and Dimethylsilanediol". Analytical Chemistry. 84 (4): 1948–1955. doi:10.1021/ac202953t. PMID 22304371.
  4. ^ Ying Duan Lei; Frank Wania; Dan Mathers (2010). "Temperature-Dependent Vapor Pressure of Selected Cyclic and Linear Polydimethylsiloxane Oligomers". Journal of Chemical & Engineering Data. 55 (12): 5868–5873. doi:10.1021/je100835n.
  5. ^ Record of Decamethylcyclopentasiloxan in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 25. September 2015.
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