Complex hydrogen bonded cations. The benzimidazole benzimidazolium cation

1976 ◽  
Vol 54 (15) ◽  
pp. 2470-2481 ◽  
Author(s):  
B. Borah ◽  
J L. Wood
Keyword(s):  
Raman Spectra ◽  
Asymmetric Structure ◽  
Infrared And Raman Spectra ◽  
X Ray ◽  
Proton Potential ◽  
Complex Salts ◽  
Structure In Solution ◽  
Hydrogen Bonded

The complex salts (Bz2H)+Y−, Bz = benzimidazole, Y = PF6− or BF4− have been identified in solution, and the molecularity of the fluoroborate, which has been crystallised, confirmed gravimetrically. Infrared and Raman spectra, together with those of the deuterated systems, indicate a similar structure in solution and the crystal, viz., an asymmetric single minimum bridging proton potential, in conformity with the X-ray structure, proving that the pronounced doublet observed in the vs band of the H bridged system is not due to proton tunnelling. The origin of the asymmetric structure is discussed.

Schwingungsspektren und Kraftkonstanten der Hexacyano-Komplexe des Mangan(I), Technetium(I) und Rhenium(I) / Vibrational Spectra and Force Constants of the Hexacyano Complexes of Mangan(l), Technicium(I) and Rhenium(l)

1972 ◽  
Vol 27 (8-9) ◽  
pp. 1193-1196 ◽  
Author(s):  
W. Krasser ◽  
K. Schwochau
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Point Group ◽  
Force Constants ◽  
Irreducible Representations ◽  
Infrared And Raman Spectra ◽  
Valence Force ◽  
Valence Force Field ◽  
Complex Salts

The infrared and Raman spectra of the complex salts K5[Mn(CN)6], K5[Tc(CN)6] and K5[Re(CN)s] have been recorded in the range from 4000 to 40 cm-1. All expected fundamental vibrations have been observed and could be assigned to the irreducible representations of the sym­metry point group Oh . The calculation of the force constants is based on the concept of the generalized valence force field. The low CN-valence force constants indicate the relatively strong Π-bonding character of the metal carbon bond, which is especially pronounced for K5[Tc(CN)6).

scholarly journals Darstellung, Kristallstruktur und Schwingungsspektren von cyclo-Undekaschwefel (S11) und von cyclo-Tridekaschwefel (S13) / Preparation, Crystal Structure, and Vibrational Spectra of cyclo-Undecasulfur (S11) and of cyclo-Tridecasulfur (S13)

1986 ◽  
Vol 41 (8) ◽  
pp. 958-970 ◽  
Author(s):  
Ralf Steudel ◽  
Jürgen Steidel ◽  
Torsten Sandow
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Infrared And Raman Spectra ◽  
X Ray ◽  
Bond Angles ◽  
Torsional Angles

AbstractThe homocyclic S11 and S13 molecules have been synthesized from titanocenepentasulfide and S6Cl2 or S8Cl2, respectively, and obtained as yellow crystals which are metastable for several days at 20 °C. X-Ray structural analyses of single crystals at -105± 5 °C exhibited molecules of approximately C2 symmetry with bond distances (d), bond angles (a) and torsional angles (r) in the following ranges: S11 : d = 203.2 -211.0 pm, α = 103.3-108.6°, τ = 69.3 - 140.5°; S13: d = 197.8 - 211.3 pm, α = 102.8-111.1°, τ = 29.5 - 116.3°. Infrared and Raman spectra of S11 and S13 are reported. In addition, the synthesis of S6Cl2 and S8Cl2 from S6 or S8, respectively, and chlorine is described.

The Vibrational Spectra and Crystal Structure of Acenaphthylene

1973 ◽  
Vol 51 (3) ◽  
pp. 402-404 ◽  
Author(s):  
A. Bree ◽  
R. A. Kydd ◽  
V. V. B. Vilkos ◽  
R. S. Williams
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Room Temperature ◽  
Infrared And Raman Spectra ◽  
Depolarization Ratio ◽  
X Ray

A study of the polarized infrared and Raman spectra of acenaphthylene single crystals has been made. These results, together with Gordon and Yang's preliminary X-ray work, suggest that the molecules pack in some disordered arrangement in the solid at room temperature. Most of the A1 fundamentals were identified in the Raman solution spectrum from their low depolarization ratio, and a few tentative assignments of nontotally symmetric fundamentals were made.

Preparation, Infrared and Raman Spectra, and Stereochemistries of Pentacoordinate Trimethylphosphine Complexes, MX4•P(CH3)3 and MX4•P(CD3)3 where M = Ge or Sn and X = Cl or Br

1973 ◽  
Vol 51 (16) ◽  
pp. 2697-2709 ◽  
Author(s):  
D. K. Frieson ◽  
G. A. Ozin
Keyword(s):  
Solid State ◽  
Raman Spectra ◽  
Axial Ligand ◽  
Axial Position ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
X Ray ◽  
Trigonal Bipyramidal ◽  
Equatorial Ligand

The 1:1 adducts MX4•PMe3 (M = Ge or Sn; X = Cl or Br) are prepared by recrystallization of the respective 1:2 complexes from excess MX4 acceptor. Solid state infrared and Raman Spectra and X-ray powder photographs suggest that these adducts are all trigonal bipyramidal with the ligand in an axial position. Normal coordinate calculations in C3v symmetry (axial ligand) and Cs symmetry (equatorial ligand) support this assignment. The rather high ν(MP) frequencies indicate unusually strong metal–phosphorus donor bonds in these compounds.

Röntgenographische und spektroskopische Untersuchung einiger gemischter Magnesium/Calcium-Fluoroapatite/X-Ray and Spectroscopic Investigation of Some Mixed Magnesium/Calcium Fluoroapatites

1984 ◽  
Vol 39 (4) ◽  
pp. 449-451 ◽  
Author(s):  
M. C. Apella ◽  
E. J. Baran
Keyword(s):  
General Formula ◽  
Raman Spectra ◽  
Spectroscopic Investigation ◽  
Unit Cell ◽  
Crystallographic Data ◽  
Negligible Effect ◽  
Magnesium Concentration ◽  
Infrared And Raman Spectra ◽  
X Ray ◽  
Hard Tissues

Crystallographic data for mixed apatites of general formula MgxCa10-x(Po4)6F2 (x = 1 - 4) have been obtained from X-ray powder data. The unit cell becomes increasingly distorted with the increase of magnesium concentration. The infrared and Raman spectra show that the magnesium incorporation has a negligible effect on the strength of the P - O bonds. The results are discussed in relation with their relevance to the properties of vertebrate hard tissues.

A vibrational study of tautomerism and associations of 2-mercaptoimidazole and 2-mercaptothiazole

1989 ◽  
Vol 54 (8) ◽  
pp. 2045-2053 ◽  
Author(s):  
Jesús Perez-Peña ◽  
Melchor Gonzalez-Davila ◽  
Miguel Suarez-Tangil ◽  
Joaquin Hernandez-Brito
Keyword(s):  
Solid State ◽  
Raman Spectra ◽  
Thermodynamic Functions ◽  
Infrared And Raman Spectra ◽  
Dilute Solutions ◽  
Vibrational Study ◽  
Combination Bands ◽  
General Assignment ◽  
Hydrogen Bonded

Infrared and Raman spectra of 2-mercaptoimidazole and 2-mercaptothiazole in solid state as well as i.r. spectra of 2-mercaptothiazole in HCCl3 and CS2 0.05M solutions have been investigated. A general assignment of all the observed bands is proposed for both fundamental vibrations and for overtone and combination bands. For 2-mercaptothiazole, the thiocarbonyl-form, intermolecularly hydrogen-bonded dimers in solid state, and unassociated molecules in dilute solutions of inert solvents have been established. Finally, based on this data, thermodynamic functions have been computed.

Infrared and Raman Spectra of Bis(Melaminium) Sulfate Dihydrate

2003 ◽  
Vol 2003 (8) ◽  
pp. 518-521 ◽  
Author(s):  
M.K. Marchewka
Keyword(s):  
Raman Spectra ◽  
Vibrational Spectra ◽  
Crystalline State ◽  
Room Temperature ◽  
Spectral Features ◽  
Infrared And Raman Spectra ◽  
X Ray ◽  
Internal Vibrations

Room temperature powder infrared and Raman measurements for the new melaminium salt, bis(2,4,6-triamino-1,3,5-triazin-1-ium) sulfate dihydrate, 2C3H7N6+·SO42-·2H2O, in the crystalline state, were carried out. The vibrational spectra in the region of internal vibrations of the ions corroborate recent X-ray data of Janczak et al. Some spectral features of this new crystal are referred to those of other crystalline melaminium salts.

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