Conformational analysis of p-terphenyl by vibrational spectroscopy

Ghanem, Antoine; Bokobza, Liliane; Noël, Claudine; Marchon, B.

doi:10.1016/0022-2860(87)85006-8

Cited by 25 publications

(24 citation statements)

References 29 publications

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“…However, a parallel orientation of neighboring phenylene rings is probably prevented by steric repulsion of the atoms in the ortho positions. [33][34][35][36] The oligomers form thinner layers on gold than the polymers. This may be due to the lower content of bulky side groups or to a reduced affinity of the oligomers to the metal surface.…”

Section: Discussionmentioning

confidence: 99%

Preparation and Characterization of Ultrathin Layers of Substituted Oligo- and Poly(p-phenylene)s and Mixed Layers with Octadecanethiol on Gold and Copper

Brunner¹,

Caseri²,

Suter³

et al. 1999

Langmuir

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Substituted poly(p-phenylene)s were adsorbed from solution onto gold and copper and oligo(p-phenylene)s onto gold. The layers were investigated with IR spectroscopy at grazing incidence reflection, XPS, NEXAFS, ToF-SIMS, surface profilometry, AFM, SEM, optical microscopy, ellipsometry, and contact angle measurements to examine their formation and structure. The structure and the properties of the investigated layers depend not only on the chemical structure of the polymer but also on the type of substrate. On gold, the polymers form layers of 15-25 Å in thickness and the oligomers of ca. 5 Å in thickness. On copper, "thick" layers of up to 900 Å were also observed. The oligomers have a lower affinity to gold than the polymers. Mixed octadecanethiol-polymer layers were prepared by immersion of polymer-coated substrates in an octadecanethiol solution or by exposure of self-assembled monolayers of octadecanethiol to polymer solutions. The structure of the mixed layers depends on the sequence of the exposure of the two components and on the chemical structure of the polymer. In the mixed layers, structures that protrude above the surroundings were frequently detected at the surface.

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Section: Discussionmentioning

confidence: 99%

Preparation and Characterization of Ultrathin Layers of Substituted Oligo- and Poly(p-phenylene)s and Mixed Layers with Octadecanethiol on Gold and Copper

Brunner¹,

Caseri²,

Suter³

et al. 1999

Langmuir

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show abstract

“…In the higher-pressure monoclinic crystal phase (Z ¼ 2), the Davydov splittings collapse. Table 3 shows the correlation diagram for the vibrational mode symmetries for the isolated molecule, the site symmetry, and crystallographic space group for both monoclinic and triclinic p-terphenyl [19]. Although phonons were not a focus of this study, the hindered rotational and hindered translational phonon modes are indicated as r and t, respectively, in Table 3.…”

Section: Ir Band Doublets Observed In Triclinic P-terphenylmentioning

confidence: 99%

“…A number of structural and spectroscopic studies of para-terphenyl have been reported, including X-ray [16,17], infrared (IR) [18,19], Raman [14,20,21], and neutron scattering [22][23][24] measurements under a variety of temperature and pressure conditions. Molecular dynamics (MD) simulations have also been reported for the temperature-induced order-disorder transition [25], and pressure-induced planarization of p-terphenyl [26].…”

Section: Introductionmentioning

confidence: 99%

“…The low-pressure (0-5 kbar) low-temperature crystal structure is triclinic (pseudo-monoclinic) with space group P1 (Z ¼ 4), and a C 2h molecular symmetry in a C i symmetry site [19]. At higher temperature (T4193 K), the crystal undergoes an order-disorder phase transition to a monoclinic crystal phase.…”

Section: Introductionmentioning

confidence: 99%

“…At higher temperature (T4193 K), the crystal undergoes an order-disorder phase transition to a monoclinic crystal phase. The high-temperature (T4193 K) ambient pressure crystal structure in monoclinic with space group of P2 1 /a (Z ¼ 2), with a mean planar molecular symmetry of D 2h also in a C i symmetry site [19]. The triclinic and monoclinic crystal structures are illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-resolution FTIR study of the para-terphenyl phase transition at high pressure

Schatschneider

Chronister

2007

Journal of Luminescence

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Effects of Spatial Constraints and Brønsted Acid Site Locations on para‐Terphenyl Ionization and Charge Transfer in Zeolites

et al. 2011

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The locations of Brønsted acid sites (BAS) in the channels of medium-pore zeolites have a significant effect on the spontaneous ionization of para-terphenyl (PP(3)) insofar as spatial constraints determine the stability of transition states and charge-transfer complexes relevant to charge separation. The ionization rates and ionization yield values demonstrate that a strong synergy exists between the H(+) polarization energy and spatial constraints imposed by the channel topology. Spectroscopic and modeling results show that PP(3) incorporation, charge separation, charge transfer and charge recombination differ dramatically among zeolites with respect to channel structure (H-FER, H-MFI, H-MOR) and BAS density in the channel. Compartmentalization of ejected electrons away from the initial site of ionization decreases dramatically the propensity for charge recombination. The main mode of PP(3)(.+) decay is hole transfer to form AlO(4)H(.+) ⋅⋅⋅PP(3) charge-transfer complexes characterized by intense absorption in the visible range. According to the nonadiabatic electron-transfer theory, the small reorganization energy in constrained channels explains the slow hole-transfer rate.

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Conformational analysis of p-terphenyl by vibrational spectroscopy

Cited by 25 publications

References 29 publications

Preparation and Characterization of Ultrathin Layers of Substituted Oligo- and Poly(p-phenylene)s and Mixed Layers with Octadecanethiol on Gold and Copper

Preparation and Characterization of Ultrathin Layers of Substituted Oligo- and Poly(p-phenylene)s and Mixed Layers with Octadecanethiol on Gold and Copper

High-resolution FTIR study of the para-terphenyl phase transition at high pressure

Effects of Spatial Constraints and Brønsted Acid Site Locations on para‐Terphenyl Ionization and Charge Transfer in Zeolites

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