Octamethyl-POSS CAS 17865-85-9
| CAS No. | 17865-85-9 |
| Molecular Formula | C8H24O12Si8 |
| Molecular Weight | 536.95 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 536.95 g/mol gives Octamethyl-POSS distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
Octamethyl-POSS (CAS 17865-85-9), molecular formula C8H24O12Si8 and molecular weight 536.95 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a carbohydrate-derived structure, Octamethyl-POSS is typically white to off-white crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 536.95 g/mol — guide the selection of appropriate sample preparation and analytical techniques.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C8H24O12Si8 |
| Molecular Weight | 536.95 g/mol |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | -3.0 |
| CAS Registry Year (est.) | 1962 |
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- 2,2,3,3,9,9,10,10-Octamethyl-4,8-dioxa-3,9-disilaundecan-6-ol (CAS 85951-09-3)
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