Synthesis of Copillar[5]arene by Co-oligomerization of Different Monomers and Its Application to Supramolecular Polymer Gel

A copillar[5]arene derivative with different repeating units was synthesized by co-oligomerization of different alkyl ethers.Copillar[5]arene-based supramolecular polymer gel was formed by a self-inclusion complexing in acetonitrile.The supramolecular polymer gel was driven by the C-H•πinteractions,and presented two phases as time went on,and finally,constructed the supramolecular organic framework.Notably,the supramolecular polymer gel showed reversible gel-sol phase transitions upon heating and cooling.Meanwhile,the transparent films formed by the supramloecular gel show the potential application in the field of anti-acid rain materials.

A Rational Designed Dual-channel Chemosensor for Mercury Ions Based on Hydrolysis of Schiff Base

A bilateral Schiff base is reported for the colorimetric and fluorometric dual-channel sensing of Hg^(2+)ions by taking advantage of the hydrolysis of carbon-nitrogen double bond,altering an ICT state mechanism and then Hg^(2+) ions coordinating with amino moieties of 1,5-DAN and leading to the aggregation of 1,5-DAN.Meanwhile,it formed a stable neutral complex of amino-Hg-amino.In addition,test strips based on L were fabricated,which also exhibited a good selectivity to Hg^(2+) as in solution.This work provides a novel approach for the selective recognition of mercury ions.Notably,the color changes are very significant and all the recognition processes can be observed by the naked eyes.We believe the test strips can act as a convenient and efficient Hg^(2+) test kit.

A Fluorescent Chemosensor for Dihydrogen Phosphate Ion Based on 2-[2-Hydroxy-4-(diethylamino)phenyl]-1Himidazo[4,5-b]phenazine-Fe^(3+)Ensemble

A long wavelength emission fluorescent(612 nm)chemosensor with high selectivity for H_(2)PO_(4)^(−)ions was designed and synthesized according to the excited state intramolecular proton transfer(ESIPT).The sensor can exist in two tautomeric forms(‘keto’and‘enol’)in the presence of Fe^(3+)ion,Fe^(3+)may bind with the‘keto’form of the sensor.Furthermore,the in situ generated GY-Fe^(3+)ensemble could recover the quenched fluorescence upon the addition of H_(2)PO_(4)^(−)anion resulting in an off-on-type sensing with a detection limit of micromolar range in the same medium,and other anions,including F^(−),Cl^(−),Br^(−),I^(−),AcO^(−),HSO^(−)_(4),ClO^(−)_(4)and CN−had nearly no influence on the probing behavior.The test strips based on 2-[2-hydroxy-4-(diethylamino)phenyl]-1H-imidazo[4,5-b]phenazine and Fe^(3+)metal complex(GY-Fe^(3+))were fabricated,which could act as convenient and efficient H_(2)PO_(4)^(−)test kits.