Fluorescence of p-hydroxyazobenzocrowns - Tautomeric equilibrium effect.

The spectroscopic properties of a series of para-hydroxyazobenzocrowns, including three novel compounds, were investigated using UV-Vis absorption and emission spectroscopy. This study presents, for the first time, determined quantum yield (QY) values for macrocycles of this category, ranging between 0.122 and 0.

Do Phenyl Substituents Affect the Properties of Azobenzocrown Derivatives?

New products of photo- and thermal rearrangements of 19-membered azoxybenzocrown with phenyl substituents in benzene rings in the para positions to oligooxyethylene fragments are characterized in this work. The yields of photochemical transformations depend on the solvent. Para-hydroxyazocrown is formed with yields over 50 % in propan-2-ol.

Products of Photo- and Thermochemical Rearrangement of 19-Membered di--Butyl-Azoxybenzocrown.

The preparation and characterization of products of the photochemical and thermochemical rearrangements of 19-membered azoxybenzocrowns with two, bulky, -butyl substituents in benzene rings in the positions to oligooxyethylene fragments ( positions to azoxy group, i.e., have been presented.

Novel Diazocrowns with Pyrrole Residue as Lead(II)Colorimetric Probes.

Novel 18- and 23-membered diazomacrocycles were obtained with satisfactory yields by diazocoupling of aromatic diamines with pyrrole in reactions carried under high dilution conditions. X-ray structure of macrocycle bearing five carbon atoms linkage was determined and described. Compounds were characterized as chromogenic heavy metal ions receptors.

Dipodal Tetraamide Derivatives of 1,10-Diaza-18-Crown-6 and Alkylmalonic Acids-Synthesis and Use as Ionophores in Ion Selective Membrane Electrodes.

Novel dipodal derivatives of an 18-membered diaza-crown ether with two diamide chains featuring methylmalonic or butylmalonic acid residues were obtained and tested as ionophores in ion-selective plasticized membrane electrodes. The objective of the study was to identify measurement conditions which ensure the most favorable performance for magnesium ion-selective electrodes. The relationship between the molar lipophilic anion salt-to-ionophore ratio and selectivity of electrodes was examined.

Photochemical Rearrangement of a 19-Membered Azoxybenzocrown: Products and their Properties.

The preparation and characterization of products of the chemical and photochemical rearrangements of a 19-membered o,o'-azoxybenzocrown are presented. In photochemical rearrangement, besides the expected product i. e.

Azo group(s) in selected macrocyclic compounds.

Azobenzene derivatives due to their photo- and electroactive properties are an important group of compounds finding applications in diverse fields. Due to the possibility of controlling the isomerization, azo-bearing structures are ideal building blocks for development of e.g.

Correction to: Azo group(s) in selected macrocyclic compounds.

[This corrects the article DOI: 10.1007/s10847-017-0779-4.].

New bis(azobenzocrown)s with dodecylmethylmalonyl linkers as ionophores for sodium selective potentiometric sensors.

Novel biscrowns and were synthesized from 13-membered azobenzocrown ethers containing bromoalkylenoxy chains in position relative to the azo group. The synthesized diester molecules are dodecylmethylmalonic acid derivatives differing by the linker length. The synthesized compounds have the potential of being used as sodium ionophores in ion-selective electrodes.

Synthesis of thiol derivatives of azobenzocrown ethers. The preliminary studies on recognition of alkali metal ions by gold nanoparticles functionalized with azobenzocrown and lipoic acid.

The article presents the synthesis of novel 13- and 16-membered azobenzocrown derivatives with peripheral thiol moieties and preliminary studies assessing their possible application in plasmonic sensors based on gold nanoparticles. The effect of the length of the chain connecting the macrocycle with the thiol group and the effect of the presence of the additional functional compound, i.e.