Vibrational spectra of calix[4]resorcinarene isomers

Self-assembly of a dithiocarbamate calix[4]arene on Ag nanoparticles and its application in the fabrication of surface-enhanced Raman scattering based nanosensors

“…Finally, the relative intensity of bands at 702 and 665 cm À1 is probably related to changes in the cavity conformation, as the intensity ratio of these two bands is sensitive to the interaction of DTCX with pyrene. 6 This is corroborated by the fact that these bands are assigned to structural motions of the aromatic moieties coupled to C-O-C deformations, 19,[22][23][24][25] and also by the fact that they were not seen in the SERS of DT. 1 Thus, the I(702)/I(665) ratio can be considered a structural marker of the intramolecular cavity conformation.…”

“…This is the case of the band at 1601 cm À1 (Fig. 2(a)), assigned to u(CQC); the band at 810 cm À1 , assigned to a ring breathing motion; and that at 572 cm À1 , attributed to skeletal in-plane modes coupled to ring-CO deformations, 19,[22][23][24][25] which is markedly weakened in the SERS spectrum (Fig. 2(b) and (c)).…”

“…Since the interaction of DTCX with the metal surface takes place through the DT group, the aromatic central groups and the tert-butyl upper rim moieties 3,[18][19][20] are placed at a relatively far position from the surface. The short-range effect of SERS 21 accounts for the weakening of bands attributed to the latter group such as that appearing in the solid (Fig.…”

Trace analysis of polycyclic aromatic hydrocarbons using calixarene layered gold colloid film as substrates for surface‐enhanced Raman scattering

“…(b). The assignment of calixarene bands had been made in published works . The influence of the Au surface on the ester group is evident.…”

Porous biomimetic membranes: fabrication, properties and future applications

“…7 In the last century, intensive research has been carried out of biomimetic tubular structures simulating natural ion channels which can be inserted into 3-5 nm thick bilayer membranes. [8][9][10][11][12][13][14][15][16][17][18][19][20][21] Notably, one of the famous channel molecules is a pore-protein called a-haemolysin (a-HL), an exotoxin secreted by Staphylococcus aureus 22,23 which is available for engineering in the assembled pores and used for analyte detection. 24 Corresponding to the three essential properties of cell membrane, all these organic biomimetic membranes formed by BLMs showed high transport rates and good selective permeability too, while some of them could even perform in response to special stimuli such as voltage 8 and light.…”