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After 50 years from the discovery of crown-ethers, macrocyclic hosts continue to play a pivotal role in supramolecular chemistry. The presence of a cavity makes them ideal candidates to perform supramolecular functions such as catalysis, molecular and biomolecular recognition, sensing, self-assembly, and synthesis of interpenetrated architectures. In addition, thanks to their synthetic versatility, the macrocycles are considered useful platforms for the design of more elaborated structures for the self-assembly of supramolecular polymers and for applications in biomimetic chemistry. These aspects have stimulated the creativeness of the scientists that in this way started imagining novel macrocyclic structures with the aim to perform ever more advanced supramolecular functions and properties. Thus, in the last years, in addition to the most innovative aspects regarding the "old" macrocycles, much attention has also been focused on the synthesis of new macrocycles. These studies have led to the discovery of novel classes of molecules such as pillararenes, biphenarenes, calixnaphthalenes, large resorcinarenes and a wide class of heteracalixarenes, coronarenes, which have found application in several areas of supramolecular chemistry. The aim of this Research Topic is to outline the most innovative researches regarding the chemistry of macrocyclic compounds and their supramolecular properties.

Science: general issues --- biomimetic systems --- biomedical applications --- supramolecular catalysis --- cucurbiturils --- cycloparaphenylenes --- carbon-nanohoops --- pillararene --- chiral recognition

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After 50 years from the discovery of crown-ethers, macrocyclic hosts continue to play a pivotal role in supramolecular chemistry. The presence of a cavity makes them ideal candidates to perform supramolecular functions such as catalysis, molecular and biomolecular recognition, sensing, self-assembly, and synthesis of interpenetrated architectures. In addition, thanks to their synthetic versatility, the macrocycles are considered useful platforms for the design of more elaborated structures for the self-assembly of supramolecular polymers and for applications in biomimetic chemistry. These aspects have stimulated the creativeness of the scientists that in this way started imagining novel macrocyclic structures with the aim to perform ever more advanced supramolecular functions and properties. Thus, in the last years, in addition to the most innovative aspects regarding the "old" macrocycles, much attention has also been focused on the synthesis of new macrocycles. These studies have led to the discovery of novel classes of molecules such as pillararenes, biphenarenes, calixnaphthalenes, large resorcinarenes and a wide class of heteracalixarenes, coronarenes, which have found application in several areas of supramolecular chemistry. The aim of this Research Topic is to outline the most innovative researches regarding the chemistry of macrocyclic compounds and their supramolecular properties.

Science: general issues --- biomimetic systems --- biomedical applications --- supramolecular catalysis --- cucurbiturils --- cycloparaphenylenes --- carbon-nanohoops --- pillararene --- chiral recognition --- biomimetic systems --- biomedical applications --- supramolecular catalysis --- cucurbiturils --- cycloparaphenylenes --- carbon-nanohoops --- pillararene --- chiral recognition

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This volume covers a variety of topics in the rapidly developing field of chemical sensors. The purpose of this volume is to explain and illustrate the use of multifunctional materials such as polymers, calixarenes, ion conductors, biological systems, and novel semiconductors in chemical sensors. These materials differ fundamentally from standard metal oxides and metals, so their application provides opportunities to design sensors based on entirely different mechanisms of sensing. As a result, new trends in the elaboration of sensors with different functional attributes and for building instruments with previously unavailable capabilities demanded by new applications have opened up. Therefore, this book is intended to be a primary source for both fundamental and practical information related to these multifunctional materials, which will be necessary for future development.

Chemical detectors. --- Polymers. --- Polymere --- Polymeride --- Polymers and polymerization --- Macromolecules --- Chemical sensors --- Chemical apparatus --- Detectors --- Biomimetic systems --- Calixarenes --- Conductometric sensors --- Electrochemical sensors --- Gas sensors --- Ion-conducting sensors --- Molecular imprinting --- Polymers --- Semiconductors --- chemical sensors --- sensing materials --- properties --- selection --- development --- synthesis --- deposition --- modification --- Nanostructured materials. --- Nanotechnology. --- Molecular technology --- Nanoscale technology --- High technology --- Nanomaterials --- Nanometer materials --- Nanophase materials --- Nanostructure controlled materials --- Nanostructure materials --- Ultra-fine microstructure materials --- Microstructure --- Nanotechnology --- nanostructured materials --- nanomaterials --- nanotechnology --- quasi-one-dimensional metal oxide structures --- carbon nanotubes --- fullerenes --- monolayer-capped metallic nanoparticles --- porous semiconductors --- ordered mesoporous films --- zeolites --- nanocomposites --- Electrochemical sencors. --- Optical detectors.