Raman Spectroscopy of Biphenyl‐4,4'‐dithiol and p‐Terphenyl‐4,4″‐dithiol on Gold Surfaces^#

Abstract

We compared the adsorption behaviors of 1,4‐benzenedithiol (BDT), biphenyl‐4,4′‐dithiol (BPDT), and p‐terphenyl‐4,4″‐dithiol (TPDT) on gold (Au) surfaces. To check the surface orientations and possibility of multilayer formation, surface‐enhanced Raman scattering was employed for the three aromatic dithiols on gold nanoparticles (AuNPs). The Raman spectra of BDT and BPDT on AuNPs were examined, whereas those of TPDT could be obtained on an Au‐coated nanostructured silicon plate. Unlike BDT, BPDT and TPDT did not exhibit a ν(S–H) band at 2560 cm−1. Because of the additional benzene rings, multilayer formation is improbable for BPDT and TPDT under colloidal conditions.

SERS Monitoring Hot Electron Generation in Plasmonic Silver Nanocube Monolayers

“…The coated substrates were analyzed by SERS to determine the vibrational modes for each compound; the SERS spectra for each compound were performed in air under 568 nm laser illumination and are found in the Supporting Information, Figures S6–S8 . Peaks assigned to BPDT were determined from the literature. , …”

“…21 Peaks assigned to BPDT were determined from the literature. 22,23 The reactant and product molecules have a similar chemical structure; consequently, some of the vibrational modes overlap, which is why only the distinctive vibrational modes for each compound will be mentioned. Figure 3b shows the BTP reaction in sodium sulfite solution using a 488 nm laser; the distinctive peaks are the following: BTP has a stretching mode between the carbon and bromine atom (ν C−Br ) at 1560 cm −1 , TP has a ring stretching mode (ν ring ) at 1570 cm −1 , and BPDT has a phenol ring stretching mode associated with the C−C bond (ν CC(ring) ) at 1585 cm −1 .…”

Molecularly-induced roughness and oxidation in cobalt/organodithiol/cobalt nanolayers synthesized by sputter-deposition and molecular sublimation

“…Raman spectra from Co/BPDT/Co sandwiches (Fig. 8) exhibit the following signatures of BPDT: 24,[42][43][44] CvC stretching (1590 cm −1 ), C-C stretching (1288 cm −1 ) between, and C-H bending (1201 cm −1 ) within, the aromatic rings, and S-C stretching (1078 cm −1 ). The lack of an observable peak at 376.6 cm −1 indicates -SH moieties did not react with each other to form disulfides.…”