Potassium Iodide (KI) is a highly water-soluble inorganic salt composed of potassium cations (K⁺) and iodide anions (I⁻). It is typically supplied as a white crystalline solid and dissolves readily in water.
Because of its high iodide content, good water solubility, and relatively simple ionic composition, Potassium Iodide is an important reagent for iodide-based chemical reactions, analytical procedures, materials synthesis, and photovoltaic research.
High-purity grades are available for applications requiring strict control of trace-metal impurities. For example, electronic/materials research grades can reach ≥99.99% trace-metals basis, while ultra-high-purity grades are available at 99.995%.
In water, Potassium Iodide dissociates readily:
KI → K⁺ + I⁻
The resulting iodide ions participate in a variety of chemical and coordination processes.
Iodide can participate in substitution reactions and can also interact with oxidizing species. This makes Potassium Iodide useful in:
In perovskite materials, iodide ions can participate in halide-related equilibria and influence the composition and defect chemistry of the perovskite lattice.
Potassium Iodide has therefore been investigated as an additive for perovskite solar cells and light-emitting diodes, where K⁺ and I⁻ can contribute to defect passivation and improved material/device properties.
Potassium Iodide is an important additive investigated in perovskite photovoltaic research.
Applications include:
Research-grade KI can be used to introduce both K⁺ and I⁻ into perovskite precursor or post-treatment systems. Supplier information specifically identifies KI as an additive used to improve the stability and performance of perovskite solar cells and LEDs.
Potassium Iodide is widely used as an iodide source in synthetic chemistry.
Applications include:
Potassium Iodide is an important reagent in analytical chemistry.
Applications include:
Potassium Iodide can be used as a reagent in biochemical research.
Applications include:
Iodide ions can act as collisional fluorescence quenchers.
Potassium Iodide is therefore used in fluorescence-related research to investigate:
Thermo Fisher specifically lists Potassium Iodide as a fluorescence quenching agent and also notes its use in the isolation of single-stranded DNA.
High-purity Potassium Iodide can be used when low levels of metallic impurities are required.
Applications include:
High-purity KI grades are available with tightly controlled trace-metal specifications.
Commercial high-purity KI products may specify storage at 2–30°C and provide detailed impurity specifications for trace-analysis applications.
Potassium Iodide (CAS No. 7681-11-0) is widely used in:
A: Potassium Iodide is an inorganic salt with CAS No. 7681-11-0, molecular formula KI, and molecular weight 166.00 g/mol.
A: Potassium Iodide is used as an iodide source, analytical reagent, synthetic reagent, fluorescence quencher, and materials additive, including applications in perovskite solar-cell research.
A: The molecular formula is KI.
A: The molecular weight is 166.00 g/mol. NIST reports 166.0028 g/mol.
A: Yes. Potassium Iodide is highly soluble in water; commercial specifications report approximately 1,430 g/L at 25°C.
A: Yes. KI is used as an additive in perovskite solar-cell and perovskite LED research, where K⁺ and I⁻ can contribute to defect passivation and material stabilization.
A: Yes. Iodide ions can act as collisional fluorescence quenchers, and Potassium Iodide is used for fluorescence quenching studies.
A: Depending on the application, Potassium Iodide is available in ACS reagent, biochemical, trace-metal, and ultra-high-purity grades, including ≥99.0%, ≥99.99%, and 99.995% grades.
