Determination by infrared absorption of the orientation of molecules in monomolecular layers

Synthesis of carboxyl-modified rod-like SBA-15 by rapid co-condensation

“…The strong absorbance band at 1727 cm −1 is attributed to the ν(C=O) stretching vibration [22,23]. The bands at 1557 and 1420 cm −1 are related to ν as and ν s stretching vibration of COO − groups [24][25][26]. It was reported that the asymmetrical and symmetrical IR absorbance bands of COO − were located at about 1560 and 1400-1460 cm −1 [27,28].…”

Two-Dimensional Aggregation of Crown-Phthalocyanine Ligand at Air-Water Interface

“…And IR spectroscopy techniques can be used for determination of orientation of the molecules on solid/air interface. [27][28][29] For estimation of orientation of molecules in singlelayer Langmuir-Blodgett films of H 2 R 4 Pc ligand formed from diluted chloroform solution (5•10 -6 M) and transferred onto sapphire plates at surface pressures of 20 and 40 mN/m we used two IR-spectra registration techniques: reflection spectra with variable light incidence angle and transmission spectra at various positions of rotating polarizer with subsequent geometrical results processing. Chosen values of transfer surface pressures correspond to planar (20 mN/m) and perpendicular (40 mN/m) arrangements of molecule planes with respect to the subphase surface.…”

“…Further computer processing of the spectra was carried out using standard "Spectrum" software integrated into spectrometer. [27][28][29] …”

<title>Intersubband absorption in multiple quantum wells</title>

“…The Fresnel reflection (r) and transmission (t) coefficients of this system can be written as 8,9 r= ri2+r23e12 (6) 1 +r12r23e'2 t= t12t23e' The absorptance is connected with t and r by relation…”