What is Cesium Carbonate CAS 534-17-8?

CAS 534-17-8 is cesium carbonate, also written caesium carbonate or dicesium carbonate, with the molecular formula Cs2CO3. It is a white, highly deliquescent crystalline powder with strong basicity and good solubility in many organic reaction systems.

Why is cesium carbonate used in cross-coupling reactions?

It acts as a mild but effective inorganic base in reactions such as Suzuki, Heck, Sonogashira, and Ullmann coupling. Its high solubility in organic solvents and strong basicity can improve reaction homogeneity, conversion, and selectivity in complex pharmaceutical and fine-chemical synthesis.

What are the main electronic-material applications of Cs2CO3?

Cesium carbonate is used as an interface or electron-injection material in OLEDs, organic field-effect transistors, and organic or perovskite solar cells. In these devices it helps modify work function and improve charge injection and device efficiency.

How does electronic grade differ from industrial grade cesium carbonate?

Electronic grade is controlled more tightly for trace alkali and metal impurities such as sodium, potassium, rubidium, calcium, iron, and magnesium. Industrial grade may still be used in organic synthesis, while electronic-grade material is preferred for sensitive optoelectronic and perovskite applications.

How should cesium carbonate be stored and handled?

It is highly hygroscopic and should be kept in tightly sealed, moisture-proof packaging. Store in a dry area, minimize air exposure, and use inert-gas protection for long-term storage. Standard chemical handling and dust-control practices should be followed.

Cesium Carbonate CAS 534-17-8

Cesium carbonate, registered under CAS 534-17-8, is a highly soluble and reactive inorganic base that serves as a premium reagent within the Fine Chemical sector for advanced pharmaceutical intermediate synthesis and optoelectronic materials manufacturing. This versatile dicesium carbonate functions as a powerful catalyst and base, particularly excelling in organic cross-coupling reactions where traditional alkali metal carbonates underperform due to poor solubility in organic solvents. In the specialized electronics industry, this carbonic acid dicesium salt is utilized as an electron injection material in OLED devices and as a critical precursor for synthesizing other high-purity specialty chemicals. The exceptional performance of caesium carbonate in driving complex ring-closing and amination processes makes it indispensable for precision chemical engineering. We provide this high-value intermediate with competitive factory pricing to sustain scaling manufacturing pipelines, ensuring all batches meet customized specifications for strict moisture control and trace metal limits. Our logistics team handles bulk supply via specialized argon-flushed or vacuum-sealed packaging, providing comprehensive documentation including MSDS, TDS, COA to support your quality assurance auditing and strict process compliance requirements.

CAS: 534-17-8
Synonyms: Dicesium carbonate, Carbonic acid dicesium salt, Caesium carbonate, Cesium(I) carbonate
Einecs: 208-591-9
Molecular Formula: Cs2CO3
Grade: Industrial Grade / Electronic Grade
Package: 25kg/drum, 5kg/tin, or 1kg/vacuum bottle (Specialized moisture-proof packaging)

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Product Description

For processes specified with a different alkali carbonate base, Potassium Carbonate is a separate inorganic carbonate and should not be treated as a direct substitute without process review.

1 Technical Data (Physicochemical Properties)

2 Applications

3 Storage & Safety

4 Quality Assurance

Technical Data (Physicochemical Properties)

Property	Detailed Specification / Value
Molecular Weight	325.82 g/mol
Physical State	White crystalline powder, highly deliquescent
Density	4.07 g/cm3
Melting Point	610°C (Decomposes)
Solubility (Water)	261 g/100mL (20°C)
Solubility (Organic)	Soluble in Ethanol (11g/L), DMF (119g/L), DMSO (362g/L)
Hygroscopicity	Very High (Deliquesces rapidly in air)
Refractive Index	1.626
Basicity (pKb)	Approx. 3.7

Applications

Organic Synthesis Catalysis: Highly effective base for facilitating transition-metal-catalyzed cross-coupling reactions (e.g., Suzuki, Heck, and Sonogashira couplings) in the production of complex pharmaceutical intermediates.
Optoelectronics (OLEDs): Applied as an electron injection layer material or dopant in organic light-emitting diodes to lower the operational voltage and improve overall device efficiency.
Energy Technologies: Utilized in the development and modification of perovskite solar cells and advanced fuel cell solid electrolytes.
Specialty Glass: Serves as a critical additive in the manufacturing of special optical glasses and fiber optics to alter the refractive index and improve transmission stability.

Storage & Safety

Storage: Cesium carbonate is extremely hygroscopic. It must be stored in a tightly sealed, moisture-free environment. For prolonged storage of opened containers, maintaining an inert atmosphere (nitrogen or argon) is highly recommended to prevent deliquescence and carbonate conversion. Keep away from strong acids and oxidizing agents.
Handling: Perform material transfer in a dry room or glovebox if ultra-low moisture limits must be maintained for sensitive catalytic applications. Avoid generating dust and prevent prolonged exposure to ambient humidity.
PPE Recommendations: Operators must wear chemical-safety goggles, nitrile or neoprene gloves, and a NIOSH-approved particulate respirator to avoid respiratory irritation and skin contact during bulk handling.

Quality Assurance

Our production protocol emphasizes rigorous purification techniques to separate cesium from naturally co-occurring rubidium and potassium isotopes, ensuring a baseline purity of 99.9% or higher. Each manufactured lot undergoes strict analytical profiling using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) to precisely quantify trace alkali metal impurities down to parts-per-million levels. Recognizing the chemical’s extreme sensitivity to atmospheric moisture, we implement climate-controlled packaging environments and vacuum-seal technology to guarantee that the material retains its free-flowing morphology and catalytic efficacy from the factory floor to your reactor.

FAQ - Technical & Supply Chain

Q:
What is Cesium Carbonate CAS 534-17-8?

A: CAS 534-17-8 is cesium carbonate, also written caesium carbonate or dicesium carbonate, with the molecular formula Cs2CO3. It is a white, highly deliquescent crystalline powder with strong basicity and good solubility in many organic reaction systems.
Q:
Why is cesium carbonate used in cross-coupling reactions?

A: It acts as a mild but effective inorganic base in reactions such as Suzuki, Heck, Sonogashira, and Ullmann coupling. Its high solubility in organic solvents and strong basicity can improve reaction homogeneity, conversion, and selectivity in complex pharmaceutical and fine-chemical synthesis.
Q:
What are the main electronic-material applications of Cs2CO3?

A: Cesium carbonate is used as an interface or electron-injection material in OLEDs, organic field-effect transistors, and organic or perovskite solar cells. In these devices it helps modify work function and improve charge injection and device efficiency.
Q:
How does electronic grade differ from industrial grade cesium carbonate?

A: Electronic grade is controlled more tightly for trace alkali and metal impurities such as sodium, potassium, rubidium, calcium, iron, and magnesium. Industrial grade may still be used in organic synthesis, while electronic-grade material is preferred for sensitive optoelectronic and perovskite applications.
Q:
How should cesium carbonate be stored and handled?

A: It is highly hygroscopic and should be kept in tightly sealed, moisture-proof packaging. Store in a dry area, minimize air exposure, and use inert-gas protection for long-term storage. Standard chemical handling and dust-control practices should be followed.

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