123796-82-7Relevant academic research and scientific papers
The synthesis and characterization of azocalix[4]arene based chemosensors and investigation of their properties
El?in, Serkan,?ilgi, Gülbanu Koyundereli,Bayrakdar, Alpaslan,Delig?z, Hasalettin
, p. 178 - 187 (2015/03/04)
In the present study, azocalix[4]arenes were prepared by linking 4-methoxy, 4-methyl, 4-ethyl, 4-chloro, 4-bromo and 4-nitroaniline to calix[4]arene through a diazo-coupling reaction. A new family of azocalix[4]arene tetraester derivatives, (4a-f), have been prepared with the incorporation of ethyl ester units to azocalix[4]arene. Characterization of the synthesized azocalix[4]arenes was carried using elemental analyses, UV-vis, FT-IR and 1H NMR spectroscopic techniques. The effect of varying pH levels and solvent types on the absorption ability of azocalix[n]arenes substituted with electron-donating and electron-withdrawing groups was examined. Thermal decomposition of azocalix[4]arene derivatives (4a-f) was investigated by means of thermogravimetry (TG), differential thermogravimetry (DTG) and differential thermal analysis (DTA) analyses. In conclusion of the examination of the extraction we found a selectivity characteristic of these compounds toward Ag+, Hg+ and Hg2+ cations.
A versatile approach toward chemosensor for Hg2+ based on para-substituted phenylazocalix[4]arene containing mono ethyl ester unit
El?in, Serkan,Delig?z, Hasalettin
, p. 166 - 173 (2014/05/06)
In the present study, six new azocalix[4]arenes have been synthesized by reacting calix[4]arene with p-substituted aniline and ethyl bromoacetate. Characterization of these compounds has been used by elemental analyses, UV-Vis, FT-IR and 1H NMR spectroscopic studies. Their phase transfer studies have been performed by using liquid-liquid extraction procedure. With respect to the chromogenic behavior of hosts upon metal ion complexation, mono ethyl ester azocalix[4]arene derivatives have shown a significant selectivity toward Hg2+ and Hg+ over many other cations. It has been deduced that these new compounds are selective ionophores toward metal cations (Na +, K+, Sr2+, Ag+, Hg+, Hg2+, Co2+, Ni2+, Cu2+, Zn 2+, Cr3+, Al3+ and La3+).
Autoaccelerative Diazo Coupling with Calixarene: Substituent Effects on the Unusual Co-operativity of the OH Groups
Shinkai, Seiji,Araki, Koji,Shibata, Jiro,Tsugawa, Daisuke,Manabe, Osamu
, p. 3333 - 3337 (2007/10/02)
Diazo coupling between calixarene and five substituted benzenediazonium ions in tetrahydrofuran at 5 deg C in the presence of pyridine afforded the tetrasubstituted calixarenes as main products and small amounts of mono-, di- and tri-substituted cal
Diazo-Coupling Reactions with Calixarene. pKa Determination with Chromophoric Azocalixarenes
Shinkai, Seiji,Araki, Koji,Shibata, Jiro,Tsugawa, Daisuke,Manabe, Osamu
, p. 931 - 934 (2007/10/02)
Six azocalixarenes were synthesized for the first time by diazo-coupling reactions with calixarene.The products showed unusual spectral properties including an azophenol - quinine-hydrazone tautomerism.Owing to the chromophoric nature, the four pKs
Autoaccelerative Diazo Coupling with Calixarene: Unusual Co-operativity of the Calixarene Hydroxy Groups
Shinkai, Seiji,Araki, Koji,Shibata, Jiro,Manabe, Osamu
, p. 195 - 196 (2007/10/02)
Diazo coupling between calixarene and p-nitrobenzenediazonium ion selectively afforded the tetrasubstituted calixarene and almost no mono-, di-, and tri-substituted calixarenes even in the presence of unchanged calixarene: the unusual all-or-nothing substitution is attributed to the specific hydrogen-bonding effect among the calixarene OH groups.
