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| Description 18-Crown-6 is an organic compound with the formula [C2H4O]6 and the IUPAC name of 1,4,7,10,13,16-hexaoxacyclooctadecane. It is a white, hygroscopic crystalline solid with a low melting point. Like other crown ethers, 18-crown-6 functions as a ligand for some metal cations with a particular affinity for potassium cations (binding constant in methanol: 106M−1). The point group of 18-crown-6 is S6. The dipole moment of 18-crown-6 varies in different solvent and under different temperature. Under 25°C, the dipole moment of 18-crown-6 is 2.76 ± 0.06 D in cyclohexane and 2.73 ± 0.02 in benzene. The synthesis of the crown ethers led to the awarding of the Nobel Prize in Chemistry to Charles J. Pedersen. Basic Info Chemical Name 18-crown-6 Synonyms 1,4,7,10,13,16-Hexaoxacyclooctadecane; [18]crown-6; 18-Crown-6; 18-Crown 6-Ether; 18-Crown ether-6; Expand CAS No. 17455-13-9 Molecular Formula C12H24O6 Molecular Weight 264.31500 PSA 55.38000 LogP 0.09960 Properties Appearance & Physical State Colorless crystals Density 0.995 g/cm3 Boiling Point 395.8ºC at 760 mmHg Melting Point 36-40ºC Flash Point >110ºC Refractive Index 1.4577 (50ºC) Water Solubility SOLUBLE Stability Stable. Incompatible with strong acids, strong oxidizing agents. Storage Condition Store at 0-5ºC Vapor Pressure 4.09E-06mmHg at 25°C |
