1,3,5,7,9,11,13,15-Octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane 5256-79-1 Octaphenyl-POSS® Octaphenylsilsesquioxane PSS-Octaphenyl substituted CAS 5256-79-1

Purity 97%+In StockPharmaceutical Standards
CAS No.5256-79-1
Molecular FormulaC48H88O12Si8
Molecular Weight1081.89 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

1,3,5,7,9,11,13,15-Octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane 5256-79-1 Octaphenyl-POSS® Octaphenylsilsesquioxane PSS-Octaphenyl substituted CAS 5256-79-1 chemical structure

Description

The occurrence of 1,3,5,7,9,11,13,15-Octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane 5256-79-1 Octaphenyl-POSS® Octaphenylsilsesquioxane PSS-Octaphenyl substituted is closely related to a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.

CATO supplies 1,3,5,7,9,11,13,15-Octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane 5256-79-1 Octaphenyl-POSS® Octaphenylsilsesquioxane PSS-Octaphenyl substituted (CAS 5256-79-1), a certified reference material (molecular formula C48H88O12Si8, MW 1081.89 g/mol) for analytical method development and quality control.

Structurally, 1,3,5,7,9,11,13,15-Octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane 5256-79-1 Octaphenyl-POSS® Octaphenylsilsesquioxane PSS-Octaphenyl substituted (C48H88O12Si8) contains a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 5.0, corresponding to approximately 5 ring(s) or double-bond equivalent(s). With a molecular weight of 1081.89 g/mol, it falls into the high-molecular-weight range. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).

This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.

CATO manufactures 1,3,5,7,9,11,13,15-Octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane 5256-79-1 Octaphenyl-POSS® Octaphenylsilsesquioxane PSS-Octaphenyl substituted under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.

Physical & Chemical Properties

Molecular FormulaC48H88O12Si8
Molecular Weight1081.89 g/mol
Purity97%+
StorageStore at room temperature, keep sealed and dry
Solubility (reference)Soluble in methanol, acetonitrile, DMSO, water (slightly soluble)
StabilityMay oxidize slowly on prolonged air exposure
Degree of Unsaturation (DBE)5.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1958

Recommended Standards

Why CATO?