一水氢氧化铯

Description

Cesium hydroxide monohydrate · CAS 35103-79-8 · CsHO. UNII 458ZFZ6235. Melting Point: 522 °F (NIOSH, 2024); Melting Point: 342.3 °C; Melting Point: MP: 272.3 °C.

Identification

CAS Registry Number	35103-79-8
PubChem CID	62750
Molecular formula	CsHO
IUPAC name	cesium hydroxide
UNII (FDA)	458ZFZ6235

Computed Descriptors

Molecular Weight	149.913
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	1
Rotatable Bond Count	0
Exact Mass	149.90819161
Monoisotopic Mass	149.90819161
Topological Polar Surface Area	1
Heavy Atom Count	2
Formal Charge	0
Complexity	2

Physical & Chemical Properties

Melting Point	522 °F (NIOSH, 2024)
Melting Point	342.3 °C
Melting Point	MP: 272.3 °C
Melting Point	272 °C
Melting Point	522 °F
Melting Point	315 °C
Solubility	395 % at 59 °F (NIOSH, 2024)
Solubility	300 g/100 g water at 30 °C
Solubility	(59 °F): 395%
Density	3.68 g/cu cm

Physical description & handling notes

• Cesium hydroxide is a colorless to yellow crystalline solid. Harmful to skin and eyes. Used in electric storage batteries.
• Cesium hydroxide, solution appears as an aqueous solution. Strongly corrosive. Harmful to skin and eyes. Used in electric storage batteries.
• Liquid
• Colorless or yellowish, crystalline solid. Note: Hygroscopic (i.e., absorbs moisture from the air); [NIOSH]
• COLOURLESS-TO-YELLOW HYGROSCOPIC CRYSTALS.
• Colorless or yellowish, crystalline solid.

GHS Hazard Classification

Reported hazard statements	H302 (97.8%), H314 (99.6%), H318 (65.8%), H361 (19.6%), H373 (65.8%), H402, H330, H335

Documented Uses

• Used as a polymerization catalyst; also used in photography and in electrolyte solutions for storage batteries; [HSDB]
• Battery Manufacturing [Category: Industry]
• Photographic Processing [Category: Other]
• Polyols are important raw materials for the production of polyurethane foams. Their synthesis profits from use of cesium hydroxide as base catalyst. In polyol synthesis isomerization of the starting material propylene oxide is an adverse side reaction eventually leading to chain termination in the polymerization with polyisocyanate. The tendency of polyols to undergo isomerization is minimized when using cesium hydroxide, as isomerization tendency decreases in the order Li > Na > K > Rb > Cs.
• Recommended as electrolyte in alkaline storage batteries at subzero temperatures, polymerization catalyst for siloxanes.
• By adding barium hydroxide to an aqueous solution of cesium sulfate.

Synonyms

Cesium hydroxide; 21351-79-1; Caesium hydroxide; 12182-83-1; Cesium hydroxide (Cs(OH)); UN2681; UN2682; EINECS 244-344-1; 458ZFZ6235; NSC 121987; UNII-458ZFZ6235; HSDB 7906; NSC-121987; CESIUM HYDROXIDE [MI]; DTXSID7066699; CHEBI:33988

Frequently Asked Questions

What are the CAS number and molecular formula of Cesium hydroxide monohydrate?

CAS 35103-79-8; molecular formula CsHO; molecular weight — g/mol.

What other names is Cesium hydroxide monohydrate known by?

Cesium hydroxide, 21351-79-1, Caesium hydroxide, 12182-83-1, Cesium hydroxide (Cs(OH)), UN2681.

Is Cesium hydroxide monohydrate classified as hazardous?

Hazard statements reported: H302, H314, H318, H361, H373.

What are the key physical properties of Cesium hydroxide monohydrate?

Melting Point: 522 °F (NIOSH, 2024); Melting Point: 342.3 °C; Melting Point: MP: 272.3 °C; Melting Point: 272 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.