Arsenazo III
Also known as: Arsenazo III, 2,7-Bis(2-arsonophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid, 2,7-Bis(2-arsonophenylazo)chromotropic acid, 3,6-bis[(2-arsonophenyl)azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic acid, 2,2'-(1,8-Dihydroxy-3,6-disulfonaphthylene-2,7-bisazo)bisbenzenearsonic acid, Neothorine, Arsenazo III free acid, Arsenazo III sodium salt, 2,7-Naphthalenedisulfonic acid, 3,6-bis[(2-arsonophenyl)azo]-4,5-dihydroxy-, MFCD00036695, EINECS 216-788-6
Arsenazo III (CAS 1668-00-4) is a compound in the Nitrogen Compounds category listed in the Jingsj chemical database. It has the molecular formula C22H18As2N4O14S2 and a molecular weight of 776.370 g/mol. Key property: a melting point of >320ºC(lit.). It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H331 — Toxic if inhaled and H410 — Very toxic to aquatic life with long lasting effects. It is listed by 2 suppliers, 1 of which publish reference prices, from 128.16 to 147.00 CNY. Record last updated Nov 3, 2026.
- CAS No.
- 1668-00-4
- Jingsj CID
- J-44985-0
- Molecular Formula
- C22H18As2N4O14S2
- Molecular Weight
- 776.370 g/mol
- Category
- Nitrogen Compounds
- Last updated
- 11/3/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
In Stock | >95.0%(T) 25g | ¥3,204.00 | $19.18 /gBest ¥128.16/g CNY | CN China MOQ 25g | |
In Stock | >95.0%(T) 10g | ¥1,335.00 | $19.98 /g ¥133.50/g CNY | CN China MOQ 10g | |
In Stock | >95.0%(T) 5g | ¥687.00 | $20.56 /g ¥137.40/g CNY | CN China MOQ 5g |
Physicochemical Properties
| Melting Point | >320ºC(lit.) |
|---|---|
| Exact Mass | 775.869263 |
| PSA | 330.46000 |
| LogP | -5.25 |
| Appearance | Powder | Brown |
| Additional Property | ammonium hydroxide: soluble1mg/mL |
GHS Safety & Compliance
- H301 — Toxic if swallowed
- H331 — Toxic if inhaled
- H410 — Very toxic to aquatic life with long lasting effects
Activity & Biological Data
| Additional Information | [1]. Arsenazo III is a dye useful fKendrick NC. Purification of arsenazo III, a Ca2+-sensitive dye. Anal Biochem. 1976 Dec;76(2):487-501. [2]. Savvin S B. Analytical use of arsenazo III: determination of thorium, zirconium, uranium and rare earth elements. Talanta, 1961, 8(9): 673-685. |
|---|
Frequently Asked Questions
What is the CAS number of Arsenazo III?
The CAS number of Arsenazo III is 1668-00-4.
What are the molecular formula and molecular weight of Arsenazo III?
Arsenazo III has molecular formula C22H18As2N4O14S2 and molecular weight 776.370 g/mol.
Which suppliers offer Arsenazo III?
2 supplier(s) listed; reference unit price ¥128.16–147.00 /g.
Is Arsenazo III hazardous?
Arsenazo III has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H331 — Toxic if inhaled; H410 — Very toxic to aquatic life with long lasting effects.
What are the upstream and downstream products of Arsenazo III?
For Arsenazo III, Upstream Products: Chromotropic acid.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Arsenazo III (CAS 1668-00-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-44985-0 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.