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Kryptofix®, Crown Ethers

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Kryptofix and Crown Ethers

EMD Millipore's crown ethers and Kryptofix® compounds offer remarkable opportunities for both synthesis and analysis. From chemical reactions involving ions, to the separation or identification of ions, you can rely on our high-quality portfolio of monocyclic and macrobicyclic complexing agents to solve your challenges.

Kryptofix®— macrobicyclic neutral ligands

  • Kryptofix® compounds are cryptands, a Nobel Prize winning subject in chemistry in 1987.
  • EMD Millipore produces all Kryptofix® compounds in its own production plant in Darmstadt, Germany.
  • Kryptofix® compounds are preferred ligands for the complexation of alkali and alkaline earth metal ions.

Application

  • Separation of cation mixtures.
  • Development of cation exchangers.
  • Selective extraction of particular ions from salt solutions or for body detoxification (e.g. the decorporation of traces of heavy metals).

Crown ethers — monocyclic complexing agents

  • Crown ethers form complexes with numerous cations, especially with alkali and alkaline earth ions including the ammonium ion.
  • The stability of the complex is solvent-dependent.
  • If water is used instead of organic solvents, water molecules participate in complex formation.

Applications

  • Used in phase transfer catalysis.
  • Wittig reactions may be carried out under mild conditions in the presence of crown ethers.

Kryptofix®is a registered trademark of Merck KGaA, Darmstadt, Germany.

ArticleProductOrd. NoPack SizeSpecial Ion selectivityDiameterStructure
813714 Crown ether / 12-Crown-4 8137140006 5 ml Li+ 1.2 - 1.5 Å
813715 Crown ether / 15-Crown-5 8137150006 5 ml Na+ > K+ 1.7 - 2.2 Å
813715 Crown ether / 15-Crown-5 8137150025 25 ml Na+ > K+ 1.7 - 2.2 Å
813718 Crown ether / Benzo-15-crown-5 8137180005 5 g Na+ > K+ > Cs+ 1.7 - 2.2 Å
813885 Crown ether / N-Phenylaza-15-crown-5 8138850005 5 g Na+ > K+ > Cs+ ./.
811684 Crown ether / 18-Crown-6 8116840002 2 g K+ > Na+ > Li+ 2.6 - 3.2 Å
811684 Crown ether / 18-Crown-6 8116840005 5 g K+ > Na+ > Li+ 2.6 - 3.2 Å
811684 Crown ether / 18-Crown-6 8116840025 25 g K+ > Na+ > Li+ 2.6 - 3.2 Å
814316 Crown ether / Benzo-18-crown-6 8143160001 1 g K+ >Cs+ > Na+ 2.6 - 3.2 Å
824438 Crown ether / Decyl-18-crown-6 8244380500 500 mg K+ > Na+ > Li+ ~2.9 Å
811731 Crown ether / Dibenzo-18-crown-6 8117310005 5 g K+ > Na+ > Li+ 2.6 - 3.2 Å
811731 Crown ether / Dibenzo-18-crown-6 8117310050 50 g K+ > Na+ > Li+ 2.6 - 3.2 Å
811866 Crown ether / Dicyclohexyl-18-crown-6 8118660001 1 g K+ > Na+ > Li+ 2.6 - 3.2 Å
811866 Crown ether / Dicyclohexyl-18-crown-6 8118660005 5 g K+ > Na+ > Li+ 2.6 - 3.2 Å
813755 Crown ether / Dibenzo-24-crown-8 8137550001 1 g ./. ./.
813755 Crown ether / Dibenzo-24-crown-8 8137550005 5 g ./. ./.
811689 Kryptofix® 5 8116890005 5 g ./. ./.
811720 Kryptofix® 21 8117200001 1 g ./. ./.
811720 Kryptofix® 21 8117200005 5 g ./. ./.
810953 Kryptofix® 22 8109530001 1 g ./. ./.
810953 Kryptofix® 22 8109530005 5 g ./. ./.
810646 Kryptofix® 221 8106468250 250 μl Sr2+ > Ca2+ > Ba2+ > Na+ > K+ > Li+ > Mg2+ 1.15 ÅÅ
810646 Kryptofix® 221 8106460001 1 ml Sr2+ > Ca2+ > Ba2+ > Na+ > K+ > Li+ > Mg2+ 1.15 Å
810647 Kryptofix® 222 810647850 250 mg Ba2+ > Sr2+ > K+ > Ca2+ > Na+ > Li+, Mg2+ 1.4 Å
810647 Kryptofix® 222 8106470001 1 g Ba2+ > Sr2+ > K+ > Ca2+ > Na+ > Li+, Mg2+ 1.4 Å
810647 Kryptofix® 222 8106470005 5 g Ba2+ > Sr2+ > K++ > Ca2+ > Na+ > Li+, Mg2++ 1.4 Å
814925 Kryptofix® 222 (special quality) 8149250001 1 g Ba2+ > Sr2+ > K+ > Ca2+ > Na+ > Li+, Mg2+ 1.4 Å