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Abstract
Polythiacalix[4]amides as a novel category of polyamides, with high sorption capability towards some environmentally hazardous metal cations, especially Hg2+, have been synthesized via direct polycondensation protocol using a thiacalix[4] arene dicarboxylic acid and commercial diamines. The polyamides were obtained in high yields and possess inherent viscosities in the range of 0.55-0.75 dl/g. The photophysical characteristic was studied by looking for the maximum absorption wavelength of each polymer using UV absorption spectroscopy. Thermogravimetric analysis displayed high thermal stability for these polyamides in range of 337 to 346 °C at the point of 10% weight loss, and their char yields were about 32.9-58.5% at 600 °C. Also, glass transition temperatures were between 157 and 178 °C. To survey on possible sorption capability of these polythiacalixamides, solid-liquid extraction of some toxic transition metal cations, such as Cu2+, Co2+, Cd2+, Pb2+ and Hg2+ from wastewater was performed. Antibacterial evaluation was conducted using Gram positive and Gram negative bacteria strains and some reliable results have been obtained. The results showed some promising features of their ability for being employed as possible ingredients of industrial antibacterial membranes.
Highlights
In the last decade, scientists in the field of supramolecular chemistry have designed novel architectures of host molecules with which area of receptor chemistry has been developed.[1,2,3,4] Supramolecules, such as cyclodextrins and crown ethers, calixarene and theirs derivatives including polycalixarenes have been employed widely in catalysis,[5,6,7,8] molecular recognition or ion separation[9,10] and as sensors[11,12,13] during recent years
Thiacalixarene and its derivatives having sulfur as an excellent auxiliary chelating agent in their structure have an effective interaction with transition metal cations
We have taken the advantage of these structures for preparation of ion-selective as well as antibacterial polymers to suggest novel formulations for producing antibacterial membranes
Summary
Scientists in the field of supramolecular chemistry have designed novel architectures of host molecules with which area of receptor chemistry has been developed.[1,2,3,4] Supramolecules, such as cyclodextrins and crown ethers, calixarene and theirs derivatives including polycalixarenes have been employed widely in catalysis,[5,6,7,8] molecular recognition or ion separation[9,10] and as sensors[11,12,13] during recent years. Smart functionalization at the both upper and/or lower rim with specific complexing groups as well as replacement of CH2 bridge by oxygen or sulfur, can improve the ionic and molecular binding properties. Novel bioactive compounds with significant antibacterial and antifungal characteristics have emerged
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