Networks of hydrogen bonds between pyridones ‐ structure breaking effects by organic solvents and sensor applications

Abstract

Pyridone shows self-assembling properties via hydrogen bonds as can be shown by IR-spectroscopy. In this way networks are formed by intermolecular interaction of tris-(2-pyridone-5-carbonacid)-glycerol ester, each molecule containing three units of pyridone. The structure breaking effect of organic solvents leads to a reduced ordering of this material and can be observed directly by hyperchromic changes of the UV-absorbance. This process is traced by capacity measurements as the unpaired structures of pyridone possess a strong dipole moment. For this purpose the permittivity of an interdigital capacitor (IDC) coated with a thin solid film of the network-forming material is measured in an atmosphere of organic solvent vapours.

Array of Molecularly Mediated Thin Film Assemblies of Nanoparticles: Correlation of Vapor Sensing with Interparticle Spatial Properties

“…Such interparticle-linked thin film nanostructures were recently shown to be viable for constructing a sensing array when the array is coupled to a pattern recognition engine. , Core−shell type nanoparticles, which are broadly defined as a nanocrystal core and molecular shell of different matters in close interaction or narrowly defined as metal nanocrystal cores capped by an alkanethiolate monolayer shell in this work, are intriguing building blocks to sensing array materials because the ability to tune size, composition, functional group, and interparticle spatial properties provides effective ways to enhance sensitivity, selectivity, detection limit, and response time. − Such an enhancement stems from several important attributes of the nanoparticle assemblies, including the enrichment of ligands or voids in the high surface area-to-volume ratio nanoporous framework for signal amplifications, and the tunability of weak chemical interactions within the molecular linking/capping structures such as hydrogen bonding, ligand coordination, and van der Waals attractive forces. Some elements of these attributes have been demonstrated in our earlier work on nanostructured ion-gating channels with biomimetic specificity, which parallels synthetic or biological receptors . The coupling of these attributes to the semiconductive character of the inked nanoparticle thin film assembly provides a novel pathway to design sensing array materials, which can be implemented with a chemiresistive platform with easy array integration and low power-driven capability.…”

“…Some elements of these attributes have been demonstrated in our earlier work on nanostructured ion-gating channels with biomimetic specificity, 23 which parallels synthetic or biological receptors. 24 The coupling of these attributes to the semiconductive character of the inked nanoparticle thin film assembly provides a novel pathway to design sensing array materials, which can be implemented with a chemiresistive platform with easy array integration and low power-driven capability.…”

Nonlinear Structure−Affinity Relationships for Vapor Guest Inclusion by Solid Calixarenes

“…3,4,[10][11][12] Another related parameter is the difference between the guest boiling temperature and the decomposition temperature of the inclusion compounds. 13 Estimation of the guest binding energy is not a simple problem for the inclusion process due to its high cooperativity, [14][15][16][17] sensitivity to temperature, [18][19][20] and the presence of other components. 15,[21][22][23][24][25] These effects, if not controlled, can considerably distort the relationship between the obtained inclusion parameters and the host and guest molecular structure.…”

“…This approach was realized consistently only for the stoichiometry of the inclusion compounds. ,,− The ability of the inclusion compound to crystallize from the host solution in liquid guest is often used as a qualitative host−guest affinity parameter. ,,− Another related parameter is the difference between the guest boiling temperature and the decomposition temperature of the inclusion compounds − sensitivity to temperature, − and the presence of other components. ,− These effects, if not controlled, can considerably distort the relationship between the obtained inclusion parameters and the host and guest molecular structure.

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Influence of the guest molecular size on the thermodynamic parameters of host–guest complexes between solid tert-butylcalix[4]arene and vapours of organic compounds

“…Analogous threshold phenomena were observed previously for the formation of solid host-guest complexes. [12][13][14][15] At a guest activity 0.6 < P/P 0 < 0.8 the saturation of the isotherms obtained takes place. The methanol isotherm with a very large threshold activity reaches saturation at the upper end of the activity interval studied.…”