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Inorganic Compounds & Salts

Alkali Metal Compounds (Li, Na, K, Rb, Cs)

Lithium, sodium, potassium, rubidium and caesium salts, including high-purity halides and organic acid salts, for synthesis, optics and electrochemistry.
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Alkali metal compounds range from everyday sodium salts to rare, high-purity caesium and rubidium halides. This sub-category covers inorganic salts and organic acid salts of all five alkali metals. Examples include Cesium acetate 99.9%, Cesium bromide anhydrous beads at 99.999%, Ammonium sodium phosphate, and organic salts such as 1,1-Cyclopropanedicarboxylic acid potassium salt and 2-(2,5-Dimethylphenoxy)acetic acid in lithium, sodium and potassium forms.

The heavier alkali metals are valued in specialist uses. Caesium salts help in palladium couplings and alkylations because the large cation improves solubility and reactivity, which chemists call the caesium effect. High-purity caesium and rubidium halides serve in scintillators, infrared optics and density gradient work. Lithium salts are central to battery and electrolyte research.

Many of these salts are hygroscopic, so anhydrous grades come in sealed containers, sometimes as beads to reduce surface area. Specify purity on a trace metals basis where low metal content matters. Each lot ships with a COA and SDS, from gram bottles to kilogram packs.

Alkali Metal Compounds (Li, Na, K, Rb, Cs): questions buyers ask

What is the caesium effect in synthesis?
Caesium carbonate and other caesium salts often give faster and cleaner alkylations, cyclisations and cross-couplings than sodium or potassium salts. The large, soft caesium ion pairs weakly with anions, leaving them more reactive, and caesium salts dissolve better in organic solvents such as DMF. This is especially useful for macrocyclisation.
Why are some anhydrous halides supplied as beads?
Beads have a much smaller surface area than fine powder, so they absorb moisture more slowly when the container is opened. This helps keep anhydrous, high-purity salts dry for glovebox and crystal growth work. Beads also flow easily and are simple to weigh without creating dust.
Why buy organic acid lithium or sodium salts rather than the free acid?
Salts are often more stable, crystalline and easier to purify than the free acid. They are also used directly in coupling reactions, in formulation work, and as reference materials when an API is made as a specific salt. Choose the counter-ion your process or analytical method calls for.

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