Heterotope Wirtmoleküle zur Einlagerung von zwei verschiedenen Gästen

Reetz, Manfred T.; Niemeyer, Christoph M.; Harms, Klaus

doi:10.1002/ange.19911031124

Cited by 32 publications

(9 citation statements)

References 28 publications

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“…For example, compound 136 is capable of coordinating to potassium and fluoride ions simultaneously. Reetz et al showed that the potassium ion is bound by the crown ether moiety present in this receptor whilst the fluoride ion is held by a combination of orbital overlap with the Lewis‐acidic boron atom and electrostatic interactions with the potassium ion 152, 153. The crystal structure of the potassium fluoride complex is shown in Figure 19.…”

Section: Into the New Millennium: Templation Anion‐directed Self‐mentioning

confidence: 99%

Anion Recognition and Sensing: The State of the Art and Future Perspectives

Beer

Gale

2001

Angew. Chem. Int. Ed.

3,482

653

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Anion recognition chemistry has grown from its beginnings in the late 1960s with positively charged ammonium cryptand receptors for halide binding to, at the end of the millennium, a plethora of charged and neutral, cyclic and acyclic, inorganic and organic supramolecular host systems for the selective complexation, detection, and separation of anionic guest species. Solvation effects and pH values have been shown to play crucial roles in the overall anion recognition process. More recent developments include exciting advances in anion‐templated syntheses and directed self‐assembly, ion‐pair recognition, and the function of anions in supramolecular catalysis.

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Section: Into the New Millennium: Templation Anion‐directed Self‐mentioning

confidence: 99%

Anion Recognition and Sensing: The State of the Art and Future Perspectives

Beer

Gale

2001

Angew. Chem. Int. Ed.

3,482

653

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show abstract

“…Die Verbindung 136 koordiniert beispielsweise gleichzeitig Kalium‐ und Fluorid‐Ionen. Reetz et al fanden, dass das Kalium‐Ion von der Kronenethereinheit des Rezeptors gebunden wird, während das Fluorid‐Ion durch eine Kombination aus der Orbitalüberlappung mit dem Lewis‐sauren Boratom und der elektrostatischen Wechselwirkung mit dem Kalium‐Ion komplexiert wird 152, 153. Die Struktur des Kaliumfluorid‐Komplexes im Kristall ist in Abbildung 19 wiedergegeben.…”

Section: Auf Dem Weg Ins Neue Jahrtausend: Templatprozesse Anioneunclassified

Erkennung und Nachweis von Anionen: gegenwärtiger Stand und Perspektiven

2001

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Die Chemie der Anionenerkennung hat sich seit ihren Anfängen in den späten sechziger Jahren des 20. Jahrhunderts stark entwickelt. Anfangs waren nur positiv geladene Ammonium‐Cryptanden als Rezeptoren für Halogenid‐Ionen bekannt. Nun, am Ende des Millenniums, sind eine Vielzahl geladener und neutraler, cyclischer und acyclischer, anorganischer und organischer supramolekularer Wirte für die selektive Komplexierung, den Nachweis und die Trennung anionischer Gastmoleküle verfügbar. Bei der Anionenerkennung spielen Solvatationseffekte und der pH‐Wert eine entscheidende Rolle. In jüngerer Zeit wurden wichtige Fortschritte bei Synthesen mit anionischen Templaten, der durch Anionen gesteuerten Selbstorganisation, der Ionenpaarerkennung und der Funktion von Anionen bei der supramolekularen Katalyse erzielt.

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“…However, molecular systems that can be used for simultaneous detection of cations and anions are rather limited. [37][38][39][40][41] It may be mentioned in this context that ditopic receptors are known to exhibit cooperative effects, where binding of one ion alters the binding affinity of the other. [39,42] The design of such systems is often governed by the complexity of the target molecular structure and therefore they are difficult to synthesize.…”

Section: Introductionmentioning

confidence: 99%

Ion Interactions with a New Ditopic Naphthalimide‐Based Receptor: A Photophysical, NMR and Theoretical (DFT) Study

et al. 2012

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A new multi-component chemosensor system comprising a naphthalimide moiety as fluorophore is designed and developed to investigate receptor-analyte binding interactions in the presence of metal and non-metal ions. A dimethylamino moiety is utilized as receptor for metal ions and a thiourea receptor, having acidic protons, for binding anions. The system is characterized by conventional analytical methods. The absorption and fluorescence spectra of the system consist of a broad band typical for an intramolecular charge transfer (ICT). The effects of various metal-ion additives on the spectral behavior of the present sensor system are examined in acetonitrile. It is found that among the metal ions studied, alkali/alkaline earth-metal ions and transition-metal ions modulate the absorption and fluorescence spectra of the system. As an additional feature, the anion signaling behavior of the system in acetonitrile is studied. A decrease in fluorescence efficiency of the system is observed upon addition of fluoride and acetate anions. Fluorescence quenching is most effective in the case of fluoride ions. This is attributed to the enhancement of the photoinduced electron transfer from the anion receptor to the fluorophore moiety. Hydrogen-bond interactions between the acidic NH protons of the thiourea moiety and the F(-) anions are primarily attributed to the fluoride-selective signaling behavior. Interestingly, a negative cooperativity for the binding event is observed when the interactions of the system are studied in the presence of both Zn(2+) and F(-) ions. NMR spectroscopy and theoretical calculations are also carried out to better understand the receptor-analyte binding.

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Heterotope Wirtmoleküle zur Einlagerung von zwei verschiedenen Gästen

Cited by 32 publications

References 28 publications

Anion Recognition and Sensing: The State of the Art and Future Perspectives

Anion Recognition and Sensing: The State of the Art and Future Perspectives

Erkennung und Nachweis von Anionen: gegenwärtiger Stand und Perspektiven

Ion Interactions with a New Ditopic Naphthalimide‐Based Receptor: A Photophysical, NMR and Theoretical (DFT) Study

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