Characterization of Fermi resonances in adsorbate vibrational spectra using cluster calculations: Methoxy adsorption on Al(111) and Cu(111)

1999 ◽  
Vol 75 (4-5) ◽  
pp. 815-820 ◽  
Author(s):  
John D. Head ◽  
Yu Shi
Keyword(s):  
Vibrational Spectra ◽  
Cluster Calculations ◽  
Fermi Resonances

scholarly journals Darstellung und Charakterisierung von Tetrabutylammonium-Tetraiodooxotechnetat(V), (TBA) [TcOI4] / Preparation and Characterization of Tetrabutylammonium Tetraiodooxotechnetate(V), (TBA)[TcOI4]

1981 ◽  
Vol 36 (2) ◽  
pp. 138-140 ◽  
Author(s):  
G. Peters ◽  
W. Preetz
Keyword(s):  
Raman Spectrum ◽  
Exchange Reaction ◽  
Vibrational Spectra ◽  
Ligand Exchange ◽  
Resonance Raman ◽  
The Other ◽  
Resonance Raman Spectrum ◽  
Ligand Exchange Reaction ◽  
Complex Ion

Abstract Pure (TBA)[TcOI4] is prepared from (TBA)[TcOCl4] by ligand exchange reaction with Nal in acetone. The vibrational spectra indicate C4v symmetry for the complex ion. On excitation with the 514.5 nm line of an Ar-laser a resonance Raman spectrum is obtained showing v(TcO) = 996 cm-1 and four of its overtones, symmetrically surrounded by groups of bands arising as well from the sums as from the differences of frequencies with the other fundamentals. In contrast to the ligand exchange reaction the reduction of Tc04- with conc. HI yields products always contaminated with polyiodides. The extremely strong Raman scatterer (TBA)l3 is detected by a characteristic doublet at 111 and 116 cm-1 and even small amounts of it cover the Raman spectrum of (TBA)[TcOI4].

The Isolation and Characterization of Square Planar, Square Pyramidal, and Octahedral Copper(II) Complexes with Mixed Ligands

1978 ◽  
Vol 33 (8) ◽  
pp. 906-910 ◽  
Author(s):  
M. M. Aly
Keyword(s):  
Vibrational Spectra ◽  
Dichloroacetic Acid ◽  
Chemical Analyses ◽  
Cleavage Reaction ◽  
Mixed Ligands ◽  
Isolation And Characterization ◽  
Square Planar ◽  
Electronic And Vibrational Spectra ◽  
Heterocyclic Bases

Substitution of an acetylacetonate by a carboxylate in the neutral (acac)2Cu(II) was achieved by its reaction with tri- and dichloroacetic acid in benzene (HCO2R where R = CCl3 or CHCl2; Hacac = acetylacctone) which led to the formation of the mixed chelate square planar complex (acac)Cu(OCOR). The later complex, R = CCl3, reacted with heterocyclic bases to produce the square pyramidal complexes (acac)Cu(OCOR) (base), (base = 2- methylpyridine or quinoline); with ethylenediamine (en) to give the octahedral [(en)2Cu(OCOR)]Cl, and with methanol and piperidine or boiling methanol alone to give the methoxo-bridged (acac)Cu(OCH3)2Cu(acac). The reaction of acetylacetonate-carboxy- late-copper(II) complex (R = CHCl2) with heterocyclic bases led to the cleavage of the acetylacetonate ligand and the formation of the octahedral Cu(OCOCHCl2) · 2 base (base = pyridine, 2-, 3- or 4-methylpyridine). The same cleavage reaction took place, and also with R = CCl3, in their reaction with 8-hydroxyquinoline to form the mixed chelates (ROCO)Cu(Oxinate). These formulations are based on chemical analyses, electronic and vibrational spectra, and on conductance measurements.

A complete characterization of the vibrational spectra of sucrose

2012 ◽  
Vol 361 ◽  
pp. 212-218 ◽  
Author(s):  
Alicia Beatriz Brizuela ◽  
Laura Cecilia Bichara ◽  
Elida Romano ◽  
Alisia Yurquina ◽  
Silvano Locatelli ◽  
...  
Keyword(s):  
Vibrational Spectra ◽  
Complete Characterization

Understanding Fermi resonances in the complex vibrational spectra of the methyl groups in methylamines

2021 ◽  
Vol 23 (6) ◽  
pp. 3739-3747
Author(s):  
Qian-Rui Huang ◽  
Tomoya Endo ◽  
Saurabh Mishra ◽  
Bingbing Zhang ◽  
Li-Wei Chen ◽  
...  
Keyword(s):  
Vibrational Spectra ◽  
Fermi Resonance ◽  
Methyl Groups ◽  
Spectral Features ◽  
Fermi Resonances

Vibrational spectra of the methyl groups in mono-methylamine (MMA), dimethylamine (DMA), and trimethylamine (TMA) monomers and their clusters were measured to capture their spectral features as a result of bend/umbrella-stretch Fermi resonance (FR).

Darstellung und Charakterisierung der Tetrabutylammoniumsalze von [Tc2Cl8]2-, [Tc2Cl8]3- und [Tc2Br8]2- Preparation and Characterization of the Tetrabutylammonium Salts of [Tc2Cl8]2-, [Tc2Cl8]3- und [Tc2Br8]2-

1980 ◽  
Vol 35 (7) ◽  
pp. 797-801 ◽  
Author(s):  
W. Preetz ◽  
G. Peters
Keyword(s):  
Electronic Spectrum ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
High Extent ◽  
First Time

The reduction of [TcCl6]2- with Zn in conc. HCl after evaporation and extraction of ZnCl2 by diethylether yields a red-brown product from which after dissolving in dilute HCl by a solution of (TBA)Cl in CH2Cl2 (TBA)2[Tc2Cl8] and (TBA)3[Tc2Cl8] can be extracted. The separation is achieved by the much better solubility of the green (TBA)2[Tc2Cl8] in acetone compared with that of the grey-blue (TBA)3[Tc2Cl8]. On treatment of (TBA)2[Tc2Cl8] dissolved in acetone with bromine-free conc. HBr carmine red (TBA)2[Tc2Br8] is obtained for the first time. The vibrational spectra are similar and can be assigned according to the assumed D4h-symmetry. In the Raman spectra of both octachloroditechnetates the intensive Tc-Tc-vibration (A1g) is observed at 307 cm-1, for (TBA)2[Tc2Br8] it is found at 323 cm-1 . The electronic spectrum of (TBA)2[Tc2Cl8] agrees to a high extent with that of the corresponding Re compound

Synthesis, crystal structure and vibrational spectra characterization of CeP5O14

2012 ◽  
Vol 1028 ◽  
pp. 196-199 ◽  
Author(s):  
Mouna Mesfar ◽  
Mohamed Abdelhedi ◽  
Mohamed Dammak ◽  
Mokhtar Ferid
Keyword(s):  
Crystal Structure ◽  
Vibrational Spectra
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