Calixarenes in Action

Mandolini, Luigi; Ungaro, Rocco

doi:10.1142/p168

Cited by 415 publications

(405 citation statements)

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“…The conformation of a specific calix [4]arene sample can be easily distinguished by its characteristic 1 H-NMR patterns arising from the ArCH 2 Ar methylene protons. [44][45][46][47] Cone conformation is a preferred conformation which corresponds to the minimum energy. The cone conformer is identified by one characteristic pair of doublets of the Ar-CH 2 -Ar methylene protons (AB system, a coupling constant 2 J = 12-15 Hz is characteristic for geminal protons).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of a Series of Novel Tetra-tert-butylcalix[4]arene Linked to 1,2,4-Triazole and 1,3,4-Oxadiazole Derivatives

Dilmaghani¹,

Ghezelbash²

2016

ACSi

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A series of tetra-tert-butylcalix[4]arene linked to 1,2,4-triazole-5-thiones and 1,3,4-oxadiazole-5-thiones derivatives at lower rim were synthesized by the reaction of 1,2,4-triazole-5-thione and 1,3,4-oxadiazole-5-thione with 5,11,17,23-tetra-tert-butyl-25,27-bis(3-bromopropoxy)-26,28-dihydroxycalix[4]arene (2). The synthesized compounds were characterized by FT-IR, 1 H NMR, 13 C NMR spectral data, elemental analysis and ESI-MS.

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Section: Resultsmentioning

confidence: 99%

Synthesis of a Series of Novel Tetra-tert-butylcalix[4]arene Linked to 1,2,4-Triazole and 1,3,4-Oxadiazole Derivatives

Dilmaghani¹,

Ghezelbash²

2016

ACSi

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“…Dabestani et al also identified the presence of hydroxypyrene for pyrene in silica gel and reported the formation of pyrenediones [mass number 232 (m/z)], resulting from the oxidation of dihydroxypyrene. However, the compound in our fraction F cannot be Py(OH) 2 because the mass number of this compound is 236 (m/z) whereas the mass number of dihydroxypyrene is 234 (m/z).…”

Section: Irradiation and Photodegradation Productsmentioning

confidence: 95%

Pyrene—p-tert-butylcalixarenes inclusion complexes formation: a surface photochemistry study

Branco

Ferreira

Rego

et al. 2006

Photochem Photobiol Sci

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Diffuse reflectance and luminescence techniques were used to study the photophysics and photochemistry of pyrene within p-tert-butylcalix [n]arenes with n = 4, 6, and 8, and to study their ability to form inclusion complexes in heterogeneous media. Evidences for inclusion complex formation were found for the three hosts under study. [8]arene. This feature is particularly relevant for calix [6]arene, suggesting a very favourable situation for the hydrogen atom abstraction to occur. The analysis of the degradation products revealed the presence of hydroxypyrene as a major photodegradation product for the three hosts. Dihydro-hydroxypyrene was also formed in the case of calix[6]arene and calix [8]arene. The formation of the calixarene's phenoxyl radical and subsequent hydrogen abstraction is consistent with the formation of dihydro-dihydroxypyrene.

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“…[1][2][3][4] Functionalization of the upper rim with azo groups confers chromogenicity, or fluorogenicity that can be employed for the development of molecular diagnostics and optical sensor materials for metal cations and other important targets.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric and Electrochemical Study of Cu²⁺-Selective Azocalix[4]arene Bearing p-Carboxyl group

Kim¹,

Kim²,

Kim³

2013

Bulletin of the Korean Chemical Society

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The spectrophotometric and electrochemical properties of tetraazo(p-carboxy)phenylcalix [4]arene (p-CAC) in the presence of various metal ions were investigated by UV/Vis spectroscopy and voltammetry in CH 3 CN. p-CAC showed selective color changes to Cu 2+ over other metal ions from light orange to colorless, in accordance with hypsochromic shift in UV/Vis spectra. Voltammetric measurements also showed high selectivity for Cu 2+.

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Calixarenes in Action

Cited by 415 publications

References 0 publications

Synthesis of a Series of Novel Tetra-tert-butylcalix[4]arene Linked to 1,2,4-Triazole and 1,3,4-Oxadiazole Derivatives

Synthesis of a Series of Novel Tetra-tert-butylcalix[4]arene Linked to 1,2,4-Triazole and 1,3,4-Oxadiazole Derivatives

Pyrene—p-tert-butylcalixarenes inclusion complexes formation: a surface photochemistry study

Spectrophotometric and Electrochemical Study of Cu²⁺-Selective Azocalix[4]arene Bearing p-Carboxyl group

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Calixarenes in Action

Cited by 415 publications

References 0 publications

Synthesis of a Series of Novel Tetra-tert-butylcalix[4]arene Linked to 1,2,4-Triazole and 1,3,4-Oxadiazole Derivatives

Synthesis of a Series of Novel Tetra-tert-butylcalix[4]arene Linked to 1,2,4-Triazole and 1,3,4-Oxadiazole Derivatives

Pyrene—p-tert-butylcalixarenes inclusion complexes formation: a surface photochemistry study

Spectrophotometric and Electrochemical Study of Cu2+-Selective Azocalix[4]arene Bearing p-Carboxyl group

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Spectrophotometric and Electrochemical Study of Cu²⁺-Selective Azocalix[4]arene Bearing p-Carboxyl group