If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
56749
Imidazole
BioUltra, ≥99.5% (GC)
Synonym(s):
1,3-Diaza-2,4-cyclopentadiene, Glyoxaline
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About This Item
vapor pressure
<1 mmHg ( 20 °C)
Quality Segment
product line
BioUltra
assay
≥99.5% (GC)
form
powder or crystals
impurities
insoluble matter, passes filter test, ≤0.2% water
ign. residue (900 °C)
≤0.05%
pH
9.5-11.0 (25 °C, 0.1 M in H2O)
pKa (25 °C)
6.95
bp
256 °C (lit.)
mp
88-91 °C (lit.)
solubility
H2O: 0.1 M at 20 °C, clear, colorless
anion traces
chloride (Cl-): ≤50 mg/kg, sulfate (SO42-): ≤50 mg/kg
cation traces
Al: ≤5 mg/kg, As: ≤0.1 mg/kg, Ba: ≤5 mg/kg, Bi: ≤5 mg/kg, Ca: ≤10 mg/kg, Cd: ≤5 mg/kg, Co: ≤5 mg/kg, Cr: ≤5 mg/kg, Cu: ≤5 mg/kg, Fe: ≤5 mg/kg, K: ≤50 mg/kg, Li: ≤5 mg/kg, Mg: ≤5 mg/kg, Mn: ≤5 mg/kg, Mo: ≤5 mg/kg, Na: ≤50 mg/kg, Ni: ≤5 mg/kg, Pb: ≤5 mg/kg, Sr: ≤5 mg/kg, Zn: ≤5 mg/kg
λ
0.1 M in H2O
UV absorption
λ: 260 nm Amax: 0.10, λ: 280 nm Amax: 0.10
SMILES string
c1c[nH]cn1
application(s)
advanced drug delivery
InChI
1S/C3H4N2/c1-2-5-3-4-1/h1-3H,(H,4,5)
InChI key
RAXXELZNTBOGNW-UHFFFAOYSA-N
Application
Other Notes
1 of 1
This Item | |||
|---|---|---|---|
| assay ≥99.5% (GC) | assay ≥99.5% (GC) | assay 99% | assay 99% |
| product line BioUltra | product line BioUltra | product line ReagentPlus® | product line ReagentPlus®, Redi-Dri™ |
| Quality Level 200 | Quality Level 200 | Quality Level 200 | Quality Level 100 |
| application(s) advanced drug delivery | application(s) - | application(s) - | application(s) - |
| form powder or crystals | form flakes, powder or crystals | form crystalline | form powder |
| pH 9.5-11.0 (25 °C, 0.1 M in H2O) | pH 9.5-11.0 (25 °C, 0.1 M in H2O) | pH 9-11 at 100 g/L (23 °C) | pH 9-11 at 100 g/L (23 °C) |
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signalword
Danger
hcodes
Hazard Classifications
Acute Tox. 4 Oral - Eye Dam. 1 - Repr. 1B - Skin Corr. 1C
Storage Class
6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
wgk
WGK 2
flash_point_f
293.0 °F - closed cup
flash_point_c
145 °C - closed cup
ppe
Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges
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How is shipping temperature determined? And how is it related to the product storage temperature?
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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