Study of the Infrared Absorption Spectra of Some Pyridine Derivatives-Iodine Complexes

The ir absorption spectra of some pyridine derivatives-iodine complexes were measured in the region 400 to 1400 cm−1 and the results are discussed. The effect of complex formation on the intensities of some of the bands was investigated. The thermodynamic constants of these complexes were calculated. It was found that the stability of the complex depends to a large extent on the electronegativity as well as the position of the substituent on the pyridine nucleus. The structures of formed complexes are discussed.

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Infrared Spectra of Some Trivalent Earth Metal Cupferrone Complexes

Zeitschrift für Naturforschung B ◽

10.1515/znb-1974-1-210 ◽

1974 ◽

Vol 29 (1-2) ◽

pp. 24-27 ◽

Cited By ~ 1

Author(s):

A. H. Abou El Ela ◽

H. H. Afifi

Keyword(s):

Complex Formation ◽

Absorption Spectra ◽

Ammonium Salt ◽

Infrared Spectra ◽

Earth Metal ◽

Ir Absorption ◽

Absorption Bands ◽

Ir Absorption Spectra

The IR absorption spectra of the ammonium salt of cupferrone and aluminium, scandium, yttrium and lanthanum trivalent cupferrate complexes are investigated. The IR absorption bands identified in the region 400-4000 cm-1 are given and assigned. It is shown that on complex formation NO stretching frequencies are lowered and new absorption bands are observed and assigned to the M-O band.

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Infrared Absorption Spectra and Their Correlation with the Ti-O Bond Length Variations for TiO2 (Rutile), Na-Titanates, and Na-Titanosilicate (Natisite, Na2TiOSiO4)

Applied Spectroscopy ◽

10.1366/0003702953965786 ◽

1995 ◽

Vol 49 (11) ◽

pp. 1646-1651 ◽

Cited By ~ 22

Author(s):

Gow-Weng Peng ◽

Shou-Kang Chen ◽

Hok-Shing Liu

Keyword(s):

Bond Length ◽

Absorption Spectra ◽

Infrared Absorption ◽

Ir Absorption ◽

Crystalline Solids ◽

Absorption Bands ◽

Structural Units ◽

Structure Correlations ◽

Geometric Setting ◽

Infrared Absorption Spectra

The mid-infrared absorption spectra (400–1200 cm−1) of four TiO2-bearing crystalline solids, in the form of rutile (TiO2), Na-titanates (Na2Ti6O13/ Na2Ti3O7), and natisite (Na2TiOSiO4), are presented, providing a clear illustration of their differences in IR band structure (band pattern). Two sharp characteristic peaks of IR absorption bands of natisite have been noted at 725 and 624 cm−1, representing the internal vibration modes of TiO5 (normal) and SiO4 structural units, respectively, and obtainable by comparison with that of Ca-titanosilicate (CaTiOSiO4), NTS glass (Na2O-TiO2-SiO2), and low-cristobalite (SiO2). The tested series of TiO2-bearing crystalline solids has been helpful in presenting a case study in support for the generalization of IR spectra/structure correlations, showing that vibrational spectroscopy can be useful for understanding the crystal chemistry of crystalline solids in terms of the geometric setting of molecular structural units and chemical bonds. It has been qualitatively demonstrated that the Ti-O bond length variations may be broadly correlated with the complexity of IR absorption bands of four TiO2-bearing solids having great diversity in both chemical composition and crystalline structure.

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Study of some properties of dithiocarbamates derived from heterocyclic amines

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19800800 ◽

1980 ◽

Vol 45 (3) ◽

pp. 800-809 ◽

Cited By ~ 2

Author(s):

Štefan Kúdela ◽

Ján Garaj ◽

Helena Hofbauerová ◽

Viktor Kettmann

Keyword(s):

Physicochemical Properties ◽

Absorption Spectra ◽

Stability Constants ◽

Spectrophotometric Determination ◽

Heterocyclic Amines ◽

Ir Absorption ◽

Coulometric Determination ◽

Ir Absorption Spectra ◽

The Stability

Some physicochemical properties of sodium pentamethylenedithiocarbamate and complexes with Cu(II), Ni(II), and Fe(III) were studied. The bands in the electronic and IR absorption spectra were measured and characterized, and the possibility of coulometric determination of NaS2CN(CH2)5.2 H2O was examined. The conditions for spectrophotometric determination of trace quantities of Cu(II), Ni(II), and Fe(III) as dithiocarbamate complexes were established and the stability constants of the complexes were determined.

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Low Temperature Infrared Absorption Spectra of Cellulosics

Applied Spectroscopy ◽

10.1366/000370271779948538 ◽

1971 ◽

Vol 25 (2) ◽

pp. 196-200 ◽

Cited By ~ 13

Author(s):

Elizabeth R. McCall ◽

Nancy M. Morris ◽

Verne W. Tripp ◽

Robert T. O'Connor

Keyword(s):

Absorption Spectra ◽

Hydroxyl Groups ◽

Ir Absorption ◽

Absorption Bands ◽

Striking Increase ◽

Peak Intensity ◽

Ir Absorption Spectra ◽

Infrared Absorption Spectra ◽

Lower Temperature ◽

Valonia Ventricosa

The ir absorption spectra of Valonia ventricosa cellulose, hydrocellulose i, and hydrocellulose ii at ambient and liquid nitrogen temperatures have been compared. Some of the bands exhibit a striking increase in peak intensity at the lower temperature. On cooling, changes to lower frequencies occur in the OH stretching region and to higher frequencies in the 1800–300 cir−1 region. The changes which were observed on cooling are undoubtedly associated with hydrogen bonding effects since the positions of absorption bands in the spectra, obtained under the same conditions, of analogous specimens containing no hydroxyl groups are not affected by temperature.

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Infrared Absorption Study of HfO2 and HfO2/Si Interface Ranging from 200cm−1 to 2000cm−1

MRS Proceedings ◽

10.1557/proc-811-d10.9 ◽

2004 ◽

Vol 811 ◽

Cited By ~ 5

Author(s):

Kazuyuki Tomida ◽

Haruka Shimizu ◽

Koji Kita ◽

Kentaro Kyuno ◽

Akira Toriumi

Keyword(s):

Absorption Spectra ◽

Infrared Absorption ◽

Monoclinic Phase ◽

Peak Shift ◽

Amorphous Structure ◽

Intensity Change ◽

Ir Absorption ◽

Ir Absorption Spectra ◽

Xrd Patterns ◽

Middle Infrared

ABSTRACTIn this paper, we report infrared absorption studies of HfO2, HfO2/Si interface and Hf(1−x)SixOy. Both HfO2 crystallization and SiO2 formation at the interface can be clearly detected in the absorption spectra in the far and middle infrared regions, respectively. By measuring the intensity change and the peak shift of infrared absorption spectra as functions of annealing temperature and time together with XRD patterns, we discuss a difference of the amorphous structure between HfO2 and SiO2, and also show an evolution of HfO2 crystallization in the monoclinic phase up to 1000 °C. On the other hand, it is shown that the interfacial SiO2 layer is qualitatively similar to the thermally grown SiO2. Furthermore, it is demonstrated that a Si incorporation into HfO2 film significantly changes the IR absorption spectra, and that the Hf(1−x)SixOy film is phase-separated with an appearance of modified monoclinic phase by higher temperature annealing.

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