DFT and IR spectroscopic analysis of p-tert-butylthiacalix[4]arene

Synthesis and Characterization of Mesoporous Silica Functionalized with Calix[4]arene Derivatives

“…In the case of MPC4 3 (Figure 3C), it can be seen that there were methyl (CH 3 ) asymmetric stretching and symmetric vibrations at 2969 and 2862 cm −1 , respectively, and bridges –CH 2 – at 1424cm −1 . The bands at 807 and 755 cm −1 are related to aromatic torsion vibrations [25]. Meanwhile, the absorption at 2275 cm −1 in the spectra of MC4 1, MC4S 2, disappeared.…”

Preparation, characterization and application of p-tert-butyl-calix[4]arene-SBA-15 mesoporous silica molecular sieves

“…The results were closely in agreement with the published data [10,19,20] and indicated that p-tert-butyl-calix [4]arene was successfully bonded on the surface of the SBA-15 material. The whole band shifts of materials are observed in Table 1 [21,22]. …”

Comparative Study of Tributyltin Adsorption onto Mesoporous Silica Functionalized with Calix[4]arene, p-tert-Butylcalix[4]arene and p-Sulfonatocalix[4]arene

“…There were two bands at 1,420 and 1,379 cm −1 , and both bands seem to belong to COH bending vibration. The medium-intensity peak and the weak intensity peaks at 1,449 cm were related to aromatic torsion vibrations [24]. The band at 487 cm −1 may be assigned to the macrocycle torsion [24].…”