Structural and spectral characteristics of water molecules in aquacomplexes of uranyl nitrates

1996 ◽  
Vol 63 (5) ◽  
pp. 621-624
Author(s):  
A. P. Zazhogin ◽  
A. A. Zazhogin ◽  
A. I. Komyak ◽  
A. I. Serafimovich
Keyword(s):  
Spectral Characteristics ◽  
Water Molecules ◽  
Structural And Spectral Characteristics

scholarly journals INFRARED SPECTRA OF THIOSACCHARINATES OF CADMIUM AND LEAD COMPARISON WITH THE ANALOGOUS METAL SACCHARINATES

2017 ◽  
Vol 27 (1-2) ◽  
Author(s):  
Gligor Jovanovski ◽  
Adnan Kahil ◽  
Orhideja Grupče
Keyword(s):  
Infrared Spectra ◽  
Room Temperature ◽  
Spectral Characteristics ◽  
Crystalline Hydrate ◽  
Water Molecules ◽  
X Ray ◽  
Weak Hydrogen Bonds ◽  
Deuterated Analogue ◽  
The Fourier Transform ◽  
Cadmium And Lead

A b s t r a c t: The Fourier transform (FT) infrared spectra of thiosaccharinates of cadmium and lead in the 4000–400 cm–1 region were studied. Although the observed resemblance between the spectra recorded in KBr pellets suggests a possible similarity between their structures as well, the powder X-ray diagrams show that these two compounds are not isomorphous. The presence of broad and intense bands in the region of the HOH stretchings shows that thiosaccharinate of cadmium is a crystalline hydrate and the spectral picture in the region of the O-D stretchings of the isotopically isolated HOD molecules in the partially deuterated analogue indicates that present in its structure are at least two types of crystallographically different water molecules involved in the formation of weak hydrogen bonds. The room temperature (RT) spectrum of lead thiosaccharinate in the region of the ν(HOH) modes differs significantly from the spectrum recorded at the boiling temperature of liquid nitrogen (LNT), which may perhaps be interpreted as an indication that a phase transition is taking place on lowering the temperature. The spectrum of lead thiosaccharinate was recorded in a Nujol mull as well. While the KBr and Nujol spectra are essentially identical in the region below 1600 cm–1, no bands are observed in the HOH stretching region of the mull spectra. In fact, it was shown that the appearance of the spectra of lead thiosaccharinates depends on the emulsion preparation rate. A comparison of the spectral characteristics of the thiosaccharinates of cadmium and lead with those of the corresponding saccharinates (their crystal structures are known) was made, special attention being paid to the analysis of the SO2 stretching region in the saccharinate and thiosaccharinate compounds.

scholarly journals Morphological, structural, and spectral characteristics of amorphous iron sulfates

2015 ◽  
Vol 120 (4) ◽  
pp. 809-830 ◽  
Author(s):  
E. C. Sklute ◽  
H. B. Jensen ◽  
A. D. Rogers ◽  
R. J. Reeder
Keyword(s):  
Spectral Characteristics ◽  
Amorphous Iron ◽  
Structural And Spectral Characteristics

Structural and Spectral Characteristics of Mechanochemically Prepared CsPbBr3

2017 ◽  
Vol 53 (4) ◽  
pp. 235-243 ◽  
Author(s):  
O. Yu. Posudievsky ◽  
N. V. Konoshchuk ◽  
V. L. Karbivskyy ◽  
O. P. Boiko ◽  
V. G. Koshechko ◽  
...  
Keyword(s):  
Spectral Characteristics ◽  
Structural And Spectral Characteristics

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.

Chemistry of the Diazeniumdiolates I. Structural and Spectral Characteristics of the [N(O)NO]− Functional Group

Nitric Oxide ◽  
2001 ◽  
Vol 5 (4) ◽  
pp. 377-394 ◽  
Author(s):  
Larry K. Keefer ◽  
Judith L. Flippen-Anderson ◽  
Clifford George ◽  
Anna P. Shanklin ◽  
Tambra M. Dunams ◽  
...  
Keyword(s):  
Functional Group ◽  
Spectral Characteristics ◽  
Structural And Spectral Characteristics

A study of the structural and spectral characteristics of free and bound water in kaolinite

2016 ◽  
Vol 121 (3) ◽  
pp. 357-363 ◽  
Author(s):  
A. S. Kasprzhitskii ◽  
G. I. Lazorenko ◽  
S. N. Sulavko ◽  
V. A. Yavna ◽  
A. G. Kochur
Keyword(s):  
Spectral Characteristics ◽  
Bound Water ◽  
Free And Bound Water ◽  
Structural And Spectral Characteristics

scholarly journals STUDY OF STRUCTURAL AND SPECTRAL CHARACTERISTICS OF CRYSTAL Y3Al5O12, Al2O3 AND SrTiO3 DOPED BY 3d- OR 4f- IONS

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
Slavica Maletić ◽  
Dušan Popović ◽  
Dragana Cerović ◽  
Jablan Dojčilović
Keyword(s):  
Dielectric Permittivity ◽  
Absorption Spectra ◽  
Dielectric Spectroscopy ◽  
Structural Phase ◽  
Spectral Characteristics ◽  
Aluminum Ions ◽  
Laser Crystals ◽  
Wide Energy ◽  
The Subject ◽  
Structural And Spectral Characteristics

The subject of our research is a study of the effects of various treatments on the structural and spectral characteristics of oxides (Y3Al5O12, Al2O3 and SrTiO3) belonging to the group of ionic crystals with a wide energy band gap. We have investigated the dielectric and optical characteristics of single laser crystals of Y3Al5O12 (YAG) doped by ions from the group of iron (3d-), Al2O3 single crystal and SrTiO3 crystals doped by 3d and 4f- ions. Dielectric properties of the investigated single crystals were analyzed using dielectric spectroscopy (80 kHz – 15 MHz) in a wide temperature range (50 – 400 K). The comparison of the temperature dependence of the dielectric permittivity (εr) and dielectric loss (tanδ) at different test frequencies for undoped and doped crystals was performed. The optical properties were studied on the basis of the absorption spectra in the UV-Vis region. The experiment results showed that presence of 3d dopants in YAG crystal caused a displacement of the absorption edge and appearance of characteristic peaks. The differences observed in the absorption spectra were probably the result of the 3d ions incorporation on two possible symmetrically different positionings of aluminum ions –tetrahedrical and octahedrical– in the YAG crystal lattice. The dielectric spectroscopy measurements for samples of SrTiO3 doped by 4f ions showed anomalous behaviors of the dielectric permittivity at temperatures around the temperature of the structural phase transition 105 K.

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