Stimulus-responsive
supramolecular organogels have been broadly
studied, but the assembly of a liquid crystalline organogel with a
thermoreversible response remains a challenge. This could be attributed
to the difficulty of designing organogelators with liquid crystalline
properties. Nucleophilic aromatic substitution (S
N
Ar) has
been utilized to produce a diversity of pentafluorobenzene-containing
aromatics, which are very regioselective to
para
positions.
Those pentafluorobenzene-functionalized aromatics have been ideal
compounds for the preparation of calamitic liquid crystals. In this
context, novel fluoroterphenyl-containing main-chain polyether (FTP@PE)
was synthesized using
in situ
S
N
Ar polymerization
as a convenient and effective synthetic strategy toward the development
of fluorescent liquid crystals bearing fluoroterphenyl and ether groups.
The fluoroterphenyl unit was synthesized by Cu(I)-supported decarboxylation
cross-coupling of potassium pentafluorobenzoate and 1,4-diiodobenzene.
The chemical structures of FTP@PE were studied with
1
H/
13
C/
19
F nuclear magnetic resonance and infrared
spectra. The liquid crystal mesophases were determined with differential
scanning calorimetry and polarizing optical microscopy. Ultraviolet–visible
absorbance and emission spectral profiles showed solvatochromic activity.
The nanofibrous morphologies were studied with a scanning electron
microscope. The organogels of FTP@PE were developed in a number of
solvents via van der Waals attraction forces of aliphatic moieties
and π stacking of fluoroterphenyl groups. They demonstrated
thermoreversible responsiveness.
Tannery industries are one of the extensive industrial activities which are the major source of chromium contamination in the environment. Chromium contamination has been an increasing threat to the environment and human health. Therefore, the removal of chromium ions is necessary to save human society. This study is oriented toward the preparation of a new triazole Schiff base derivatives for the remediation of chromium ions. 4,4’-((1E)-1,2-bis ((1H-1,2,4-triazol-3-yl) imino)ethane-1,2-diyl) diphenol was prepared by the interaction between 3-Amino-1H-1,2,4-triazole and 4,4’-Dihydroxybenzil. Then, the produced Schiff base underwent a phosphorylation reaction to produce the adsorbent (TIHP), which confirmed its structure via the different tools FTIR, TGA, 1HNMR, 13CNMR, GC-MS, and Phosphorus-31 nuclear magnetic resonance (31P-NMR). The newly synthesized adsorbent (TIHP) was used to remove chromium oxyanions (Cr(VI)) from an aqueous solution. The batch technique was used to test many controlling factors, including the pH of the working aqueous solution, the amount of adsorbent dose, the initial concentration of Cr(VI), the interaction time, and the temperature. The desorption behaviour of Cr(VI) changes when it is exposed to the suggested foreign ions. The maximum adsorption capacity for Cr(VI) adsorption on the new adsorbent was 307.07 mg/g at room temperature. Freundlich’s isotherm model fits the adsorption isotherms perfectly. The kinetic results were well-constrained by the pseudo-second-order equation. The thermodynamic studies establish that the adsorption type was exothermic and naturally spontaneous.
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