Normalkoordinatenanalyse der phenanthroline teil. I. Die planaren grundschwingungen

Altmann, von W.; Perkampus, H.‐H.

doi:10.1016/0584-8539(79)80144-0

Cited by 15 publications

(11 citation statements)

References 16 publications

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“…This statement is confirmed by the similarity between the phen on transition metal spectra and the corresponding [M(phen) 3 ]-Cl 2 Raman spectrum (M ) Fe, Co, or Ni) presented in Figure 2. The metal-N(phen) stretching vibrations in the 280-320 cm -1 region 23 are also observed in the SER spectra of phen on transition metals. The wavenumber difference between the bands of phen on transition metals spectra and those in the corresponding [M(phen) 3 ]Cl 2 spectrum changes from ca.…”

Section: Resultsmentioning

confidence: 92%

1,10-Phenanthroline Adsorption on Iron Electrode Monitored by Surface-Enhanced Raman Scattering (SERS). Comparison to SERS of Phen and Its Transition Metal Complex on Silver Electrode

Andrade

Temperini

2007

J. Phys. Chem. C

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The SER spectra of 1,10-phenanthroline (phen) adsorbed on Fe electrode in chloride medium as a function of applied potentials at 632.8 and 514.5 nm excitation wavelengths are presented. SERS spectra of phen on Co and Ni electrodes at 632.8 nm are also shown. The SER signatures of the surface complex indicate its similarity with the chemically prepared [M(phen) 3 ] 2+ , where M ) Fe 2+ , Co 2+ , or Ni 2+ . The same changes in relative intensities of the bands with applied potential are observed for phen on transition metals and for [M(phen) 3 ] 2+ on silver electrodes. These spectral changes at 632.8 nm excitation radiation resemble the spectral changes in the resonance Raman spectra of [M(phen) 3 ]Cl 2 at different excitation laser lines. At the potential of maximum intensity, the strongest band in phen on Ag SER spectrum is ca. 70 times higher than that in phen on Fe, while the phen on Fe SER excitation profile is ca. 5 times higher than that of phen on Ag. At 632.8 nm radiation, the band at 557 cm -1 for phen on Fe shows the highest profile in SER excitation profiles, while for phen on Ag the most enhanced band is at 1578 cm -1 . These results indicate that the CT excited states in phen on Fe and phen on Ag are different and that the SER CT mechanism in phen on Fe is more effective. The magnitude and dissimilarities in the [Fe(phen) 3 ]Cl 2 resonance Raman profiles as compared to the SER excitation profiles of [Fe(phen) 3 ] 2+ on Ag emphasize the different origins of the two enhancement processes.

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Section: Resultsmentioning

confidence: 92%

1,10-Phenanthroline Adsorption on Iron Electrode Monitored by Surface-Enhanced Raman Scattering (SERS). Comparison to SERS of Phen and Its Transition Metal Complex on Silver Electrode

Andrade

Temperini

2007

J. Phys. Chem. C

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“…The IR spectra of [Fe(bpy) 3 ]Cl 2 ‚7H 2 O, Fe 2+ -Y zeolite, and [Fe(bpy) 3 ] 2+ /zeolite are shown in Figure 7. The spectrum of [Fe(bpy) 3 ]Cl 2 ‚7H 2 O (Figure 7a) gives bands at 735 and 779 cm -1 assigned to the deformation of the pyridine ring in the ligand and the out-of-plane C-H bending around the pyridine ring, 48 respectively. In the spectrum of [Fe(bpy) 3 ] 2+ /zeolite (Figure 7b), a band coming from the deformation appears at ∼730 cm -1 and that from the C-H bending shifts to ∼ 760 cm -1 over the absorption arising from the zeolite lattice.…”

Section: Resultsmentioning

confidence: 99%

Structural Distortion of 6-Coordinated Fe(II) Complexes in Zeolite Y

1999

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Six-coordinated Fe(II) complex ions [FeL3]2+ (L = en, amp, bpy, dmbpy, phen, and dmphen), prepared in a supercage of zeolite Y, were characterized by UV−vis, XRD, Mössbauer spectroscopy, and IR. The UV−vis spectra and XRD patterns of the zeolite encapsulating the Fe(II) complex ions show that [Fe(en)3]2+, [Fe(amp)3]2+, [Fe(bpy)3]2+, and [Fe(phen)3]2+ are formed in the zeolite supercage. The Mössbauer spectra of [Fe(bpy)3]2+ and [Fe(phen)3]2+ in the supercage gave extraordinarily large values of the quadrupole splitting for low-spin Fe(II) species, indicating that these complex ions in a supercage are distorted by a strong steric interaction with the zeolite lattice. The IR spectra of [Fe(bpy)3]2+ and [Fe(phen)3]2+ in the supercage as well as their Mössbauer results reveal that the complex ion is located in the supercage; (i) the 3-fold axis of the complex is parallel to that of the supercage, (ii) each of the three bidentate-ligand molecules in the complex faces to the 12-membered ring of the supercage, and (iii) the complex is twisted around its 3-fold axis toward a trigonal prism.

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“…The vibrational spectrum of 1,10-phenanthroline was first studied by Perkampus and Rother . Then Altmann and Perkampus performed a normal coordinate analysis of this molecule, on the basis of the force fields proposed by Schettino et al . for the in-plane vibrations of phenanthrene and by Scully and Whiffen for the out-of-plane modes of aromatic molecules.…”

Section: Normal Mode Calculationsmentioning

confidence: 99%

Surface Enhanced Raman Scattering and Normal Coordinate Analysis of 1,10-Phenanthroline Adsorbed on Silver Sols

Muniz‐Miranda¹

2000

J. Phys. Chem. A

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The surface enhanced Raman scattering of 1,10-phenanthroline adsorbed on silver sol has been obtained and analyzed by using normal mode calculations based on a valence force field suitably determined for this molecule. Evidence has been found for Ag-N bond formation with the silver surface, supporting the validity of a chemisorption process. The experimental and calculated data suggest an adsorbate-substrate interaction with perpendicular or tilted orientation of the molecule with respect to the colloidal surface. The halide anion effect on the SER spectrum improves a charge-transfer enhancement process involving adsorbate and metal electronic states. The results obtained on colloids agree with those detected by measurements performed on silver electrode. The similarity between SERS and normal Raman spectra of the corresponding 1:2 Ag(I)phenanthroline complex indicates that the molecule is perturbed upon adsorption as well as upon coordination in the argentous complex.

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Normalkoordinatenanalyse der phenanthroline teil. I. Die planaren grundschwingungen

Cited by 15 publications

References 16 publications

1,10-Phenanthroline Adsorption on Iron Electrode Monitored by Surface-Enhanced Raman Scattering (SERS). Comparison to SERS of Phen and Its Transition Metal Complex on Silver Electrode

1,10-Phenanthroline Adsorption on Iron Electrode Monitored by Surface-Enhanced Raman Scattering (SERS). Comparison to SERS of Phen and Its Transition Metal Complex on Silver Electrode

Structural Distortion of 6-Coordinated Fe(II) Complexes in Zeolite Y

Surface Enhanced Raman Scattering and Normal Coordinate Analysis of 1,10-Phenanthroline Adsorbed on Silver Sols

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