Infrared and Raman Spectra of C60 and C70 Solid Films at Room Temperature

1991 ◽  
Author(s):  
R. J. Meilunas ◽  
R. P. Chang ◽  
S. Liu ◽  
M. M. Kappes
Keyword(s):  
Raman Spectra ◽  
Room Temperature ◽  
Infrared And Raman Spectra ◽  
Solid Films

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.

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.

scholarly journals Infrared and Raman spectra of cubic form of magnesium caesium arsenate hexahydrate

2018 ◽  
Vol 37 (2) ◽  
Author(s):  
Viktor Stefov ◽  
Violeta Koleva ◽  
Metodija Najdoski ◽  
Adnan Cahil ◽  
Zuldjevat Abdija
Keyword(s):  
Raman Spectra ◽  
Room Temperature ◽  
Spectral Characteristics ◽  
Normal Modes ◽  
Water Molecules ◽  
Infrared And Raman Spectra ◽  
Cubic Form ◽  
The Matrix ◽  
Deuterated Sample ◽  
Ft Ir

Fourier transform infrared (FT-IR) spectra recorded at room temperature (RT) and at the boiling temperature of liquid nitrogen (LNT), as well as Raman spectra recorded at room temperature for the cubic polymorph of magnesium cesium arsenate hexahydrate (MgCsAsO4·6H2O) and its partially deuterated analogues, were interpreted with respect to the normal modes of the water molecules and the arsenate ions and water librations. The spectral characteristics of MgCsAsO4·6H2O were compared to the cubic form of the phosphate analogue. A spectral similarity between the two isostructural salts was established, except for the obvious differences due to the nature of the anions (AsO43– vs PO43–). The spectroscopic data for the uncoupled OD stretching mode of the matrix-isolated HDO molecules revealed that the hydrogen bonds formed in the arsenate salt were stronger than those in the phosphate. In the Raman spectrum of the protiated compound, only one very intensive band at 811 cm–1 was observed in the region of the stretching vibrations of the AsO43– ion, which was insensitive to deuteration. In accordance with the expectation, one band appeared in the same spectral range in the infrared spectra of the protiated and highly deuterated sample at 792 cm–1 and 810 cm–1, respectively, which can be attributed with certainty to the asymmetric stretching ν3(AsO4) modes.

Synthetic, Structural and Vibrational Spectroscopic Studies in Bismuth(III) Halide/N,N′-Aromatic Bidentate Base Systems. II Bipyridinium (2,2' Bipyridine) tetraholobismuthate (III) (Halogen = Chloride or Bromide)

1998 ◽  
Vol 51 (4) ◽  
pp. 311 ◽  
Author(s):  
Graham A. Bowmaker ◽  
Jack M. Harrowfield ◽  
Aaron M. Lee ◽  
Brian W. Skelton ◽  
Allan H. White
Keyword(s):  
Single Crystal ◽  
Raman Spectra ◽  
Room Temperature ◽  
Far Infrared ◽  
Spectroscopic Studies ◽  
Infrared And Raman Spectra ◽  
X Ray ◽  
Structure Determinations ◽  
Anionic Species

Syntheses and room-temperature single-crystal X-ray structure determinations are recorded for the title compounds, [bpyH]+[(bpy)BiX4]-, X = Cl, Br, the chloride being obtained in a second acetonitrile- sesquisolvated form. [bpyH]+[(bpy)BiX4]-, X = Cl, Br, are isomorphous, monoclinic C2/c, a ≈ 15·3, b ≈ 9·6, c ≈ 16·8 Å, β 109°, Z = 4, conventional R on |F| being 0·056, 0·059 for No 1456, 769 independent ‘observed’ (I > 3σ(I)) reflections respectively. [bpyH] [(bpy)BiCl4].1½MeCN is monoclinic, P21/m, a 9·572(2), b 34·521(8) c 8·218(2) Å, β 102·13(2)°, Z = 4, R 0·043 for No 2635. All anionic species are mononuclear, the bismuth being quasi-octahedral. Bands in the far-infrared and Raman spectra due to the vibrations of the N2BiCl4 core in [(bpy)BiCl4]- are assigned, and their relationship to the vibrations of [BiCl6]3- is discussed.

Syntheses, Structures and Vibrational Spectra of Some Dimethyl Sulfoxide Solvates of Bismuth(III) Bromide and Iodide

1998 ◽  
Vol 51 (4) ◽  
pp. 285 ◽  
Author(s):  
Graham A. Bowmaker ◽  
Jack M. Harrowfield ◽  
Peter C. Junk ◽  
Brian W. Skelton ◽  
Allan H. White
Keyword(s):  
Single Crystal ◽  
Dimethyl Sulfoxide ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Room Temperature ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
X Ray

Room-temperature single-crystal X-ray studies are recorded for some dimethyl sulfoxide (dmso) solvates of bismuth(III) bromide and iodide. Colourless BiBr3.3dmso is triclinic, P-1, a 8·467(4), b 9·109(4), c 13·901(4) Å, α 76·34(4), β 76·95(4), γ 64·56(4)°, Z = 2; conventional R on |F| was 0·050 for No 2306 independent ‘observed’ (I > 3σ(I)) reflections. The complex is mononuclear with a quasi-octahedral fac-bismuth environment, [(dmso-O)3BiBr3], isomorphous with the previously determined chloride. Orange BiI3-2dmso is triclinic, P-1, a 12·558(2), b 8·962(2), c 8·342(1) Å, α 61·85(1), β 78·27(1), γ 76·89(2)°, Z = 2 f.u., R 0·048 for No 1953. The complex is binuclear, a pair of iodide atoms bridging the two bismuth atoms, [(dmso-O)2I2Bi(µ-I)2BiI2(O-dmso)2]; the two O-dmso ligands about each six-coordinate bismuth lie trans. Red BiI3.2 ⅔ dmso is triclinic, P-1, a 16·435(6), b 14·926(2), c 12·396(3) Å, α 74·89(2), β 73·24(2), γ 79·18(2)°, Z = 6, R 0·059 for No 5858. The complex is [Bi(O-dmso)8] [Bi2I9], the eight-coordinate metal environment of the cation being, unusually, dodecahedral; in the anion a pair of quasi-octahedral six-coordinate bismuth atoms are bridged by three iodides, [I3Bi(µ-I)3BiI3]3-. Bands in the far-infrared and Raman spectra due to the v(BiX) modes are assigned and discussed in relation to the structures of the complexes. The assignment of the v(BiO) modes is discussed.

Crystalline-field effects on the infrared and Raman spectra of powdered alkali-metal, silver, and thallous nitrates

1970 ◽  
Vol 48 (8) ◽  
pp. 1183-1197 ◽  
Author(s):  
M. H. Brooker ◽  
D. E. Irish
Keyword(s):  
Alkali Metal ◽  
Raman Spectra ◽  
Room Temperature ◽  
Temperature Phase ◽  
Infrared And Raman Spectra ◽  
Crystalline Field ◽  
Correlation Field ◽  
Field Effects ◽  
Internal Reflectance

Infrared and Raman spectra have been recorded for room-temperature-phase, powdered samples of LiNO3, NaNO3, KNO3, RbNO3, CsNO3, AgNO3, and TlNO3. For the trigonal systems, the nitrate pairs LiNO3, NaNO3 and RbNO3, CsNO3 give almost identical spectra. For the orthorhombic systems, AgNO3 and TlNO3 give similar spectra, whereas that of KNO3 is significantly different. Site and correlation field perturbations are considerably more pronounced in the antisymmetric stretching region (ν3 ca. 1400 cm−1) than in the antisymmetric bending region (ν4 ca. 700 cm−1). Although lifting of the degeneracy of E′ modes was frequently observed, the reported split of the ν4(E′) mode (ca. 716 cm−1) of the aragonite form of KNO3 could not be confirmed. Multiple internal reflectance techniques have been employed to observe the extremely intense ν3(E′) infrared fundamental ca. 1400 cm−1.

Vibrational Spectra of Cyclic Polysilanes: Dodecamethylcyclohexasilane, All-trans-Hexabenzylcyclohexasilane, All-trans-Hexaphenylcyclohexasilane, and Dodecaphenylcyclohexasilane

1993 ◽  
Vol 47 (10) ◽  
pp. 1571-1576 ◽  
Author(s):  
Hongqi Li ◽  
Ian S. Butler ◽  
John F. Harrod
Keyword(s):  
Raman Spectra ◽  
Vibrational Spectra ◽  
Room Temperature ◽  
Vibrational Band ◽  
Infrared And Raman Spectra ◽  
Vibrational Assignments ◽  
Local Symmetries

Infrared and Raman spectra have been recorded at room temperature for the following four cyclohexasilanes: dodecamethylcyclohexasilane, (SiMe2)6 (I); all- trans-hexabenzylcyclohexasilane, [Si(H)CH2Ph]6 (II); all- trans-hexaphenylcyclohexasilane, [Si(H)Ph]6(III); and dodecaphenylcyclohexasilane, (SiPh2)6 (IV). Vibrational assignments have been proposed on the basis of the local symmetries of the silicon ring skeletons ( D3 d) and the substituent groups (Me, C3 v; Ph and CH2Ph, C2 v). The four polysilane oligomers can be readily distinguished from one another by their vibrational spectra. For example, characteristic νSiH and δSiH Raman bands of II and III were observed in the 2150–2075 and 790–600 cm−1 regions, respectively, where the vibrations of III were higher in energy than were those of II. All four oligomers exhibited distinct differences in the νSiC, νSiS, and δSiC regions located below 800 cm−1. Finally, from the observed vibrational band shifts, it appears that the σ-φ hyperconjugation between the Ph groups and Si atoms in the > SiR1R2 fragments decreases in the order: IV (R1 = R2 = Ph) > III (R1 = H, R2 = Ph) > II (R1 = H, R2 = CH2Ph).

Infrared and Raman spectra of C60and C70solid films at room temperature

1991 ◽  
Vol 70 (9) ◽  
pp. 5128-5130 ◽  
Author(s):  
Ray Meilunas ◽  
R. P. H. Chang ◽  
Shengzhong Liu ◽  
Michael Jensen ◽  
Manfred M. Kappes
Keyword(s):  
Raman Spectra ◽  
Room Temperature ◽  
Infrared And Raman Spectra

Laboratory synthesis and characterization of Knasibfite K3Na4[SiF6]3[BF4] and the homologous Ge compound K3Na4[GeF6]3[BF4]

2020 ◽  
Vol 235 (8-9) ◽  
pp. 247-254
Author(s):  
Jascha Bandemehr ◽  
Josefin Klippstein ◽  
Sergei I. Ivlev ◽  
Malte Sachs ◽  
Florian Kraus
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Raman Spectra ◽  
Hydrofluoric Acid ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
Infrared And Raman Spectra ◽  
Monoclinic Structure ◽  
Laboratory Synthesis

AbstractHerein we present the synthesis, crystal structure, and the infrared and Raman spectra of K3Na4[SiF6]3[BF4]. The compound also occurs in nature as the mineral Knasibfite. We obtained it from the reaction of stoichiometric amounts of SiO2, Na[BF4], K2CO3, and Na2CO3 in hydrofluoric acid at room temperature. Hydrofluorothermal synthesis at 200 °C lead to a product of higher purity. Knasibfite is colorless and crystallizes in space group Im 2m with a = 5.546(2), b = 9.261(2), c = 17.184(4) Å, V = 882.5(4) Å3, Z = 2, at T = 400(2) K. At 342 K a phase transition to a monoclinic structure was observed (I 2, a = 5.5003(6), b = 9.0890(9), c = 17.0048(2) Å, β = 90.041(9)°, V = 852.2(2) Å3, Z = 2, T = 100(2) K). By replacing SiO2 with GeO2 as a starting material K3Na4[GeF6]3[BF4] was obtained. This compound also crystallizes in form of two polymorphs, both of which are isotypic to the respective ones of K3Na4[SiF6]3[BF4].

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