Characterization of the Chromophore Orientation of Rhodamine B Amphiphiles in Langmuir–Blodgett Monolayers

Microscopic Organization of Long-Chain Rhodamine Molecules in Monolayers at the Air/Water Interface

“…3,30,35 The value of θ ) 54°obtained for the RhC 18 chromophore at the air/water interface in the present study is thus in good agreement with the previously reported data. In fact, the value of the average tilt angle θ of 54°agrees well with what is expected from the bond length and angle value of the RhC 18 chromophore moiety structure and typical bond distances to describe the interactions between the RhC 18 molecule and the water surface.…”

“…A complete description of the orientation distribution also depends on which components of the nonlinear polarizability tensor contribute to the total chromophore polarizability. 49 As discussed previously, 11,30,35 there are two dominant elements of rhodamine chromophore nonlinear polarizability, z′x′x′ and x′x′z′ . Then, calculating eq 2 accordingly, a condition defining the chromophore orientation in terms of the tilt angle θ with respect to the surface normal, or Euler angles δ and , Figure 4.…”

Fluorescent Cyclohexyl‐Based Chemosensors for Selective Sensing of TMA Malonate in DMSO/Water

“…The same orientation is expected for those complexes formed with adipate, glutarate and succinate; however, with malonate another geometry, one with both fluorophores in almost orthogonal planes (Figure 6), seems to be more favourable 19. By taking into acount that the S 0 → S 1 transition moments of both fluorescein20 and rhodamine B21 derivatives are parallel to the long axis of the xanthene ring system, it is expected that these transition moments are in orthogonal planes in the complex with malonate.…”

Orientation and conformation of octadecyl rhodamine B in hybrid Langmuir–Blodgett monolayers containing clay minerals

“…RhB18 consists of 51 non-H atoms (118 atoms including H) and this corresponds to 348 IR-or Raman-active bands (3N-6). From an experimental perspective, vibrational assignments require IR data collected from isotopic derivatives (i.e., RhB18 synthesized using 13 C, 2 H, 18 O, and/or 15 N) and these compounds have not been synthesized. However, the following three bands have been assigned unambiguously.…”

“…The surfaces that have been investigated regarding the orientational organization comprise intercalation compounds (e.g., interlamellar regions of clay minerals, [3][4][5][6][7][8][9] K 4 Nb 6 O 17, 10 aluminium oxide 11 ) and flat substrates (e.g., external surfaces of clay minerals, 12,13 gold, 14 water, 15,16 glass/quartz [17][18][19][20] ). The orientation of dye molecules adsorbed on surfaces has been determined using one or a combination of the following techniques: X-ray diffraction, [5][6][7]9,10 polarized ultraviolet-visible (UV-Vis) spectroscopy, 6,10,12,17,19,20 fluorescence spectroscopy, 16 molecular modeling, 9 scanning tunneling microscopy, 14 second harmonic generation, 13,[15][16][17][18] near edge X-ray absorption fine structure spectroscopy 21 and polarized transmission infrared spectroscopy. [6][7][8] Smectite clay minerals are silicate materials that consist of ca.…”