Structure of donor-acceptor complexes. X. Complexes of cyanoacetamide with Lewis acids

1969 ◽  
Vol 22 (7) ◽  
pp. 1381 ◽  
Author(s):  
RC Paul ◽  
SL Chadha
Keyword(s):  
Oxygen Atom ◽  
Spectral Data ◽  
Infrared Spectra ◽  
Lewis Acids ◽  
Far Infrared ◽  
Carbonyl Oxygen ◽  
Aluminium Chloride ◽  
Infrared Spectral ◽  
Donor Acceptor ◽  
Ionic Nature

Complexes of cyanoacetamide with aluminium chloride and bromide, anti- mony(V) chloride, boron(III) bromide, tin(IV) chloride and bromide, titanium(IV) chloride and bromide, and zirconium(IV) chloride have been prepared. The molar conductances of the complexes in nitrobenzene indicate their non-ionic nature. The infrared spectra indicate bonding of the metal halides to the carbonyl oxygen atom of the ligand. Metal- to-oxygen bonding also gets support from the far-infrared spectral data.

2-Aminothiazole, acetylaminothiazole, dimethylhydantoin and thiohydantoin complexes of tin(IV) and titanium(IV) halides

1974 ◽  
Vol 27 (8) ◽  
pp. 1827 ◽  
Author(s):  
PP Singh ◽  
UP Shukla
Keyword(s):  
Infrared Spectra ◽  
Donor Site ◽  
Far Infrared ◽  
Carbonyl Oxygen ◽  
Spectral Studies ◽  
Infrared Spectral ◽  
Far Infrared Spectra

Complexes of the type MX4L2 (M = Sn, Ti; X = Cl, Br, I; L = dimethylhydantoin, thiohydantoin, 2-aminothiazole and 2-acetylaminothiazole) have been prepared and characterized. Infrared spectral studies indicate exocyclic nitrogen of 2:aminothiazole and carbonyl oxygen of all other ligands as the donor site. Far-infrared spectra suggest that dimethylhydantoin and 2-acetylaminothiazole complexes are trans, and 2-aminothiazole and thiohydantoin complexes are cis octahedral.

INFRARED SPECTRA OF 2,6-DIMETHYL-4-PYRONE COMPLEXES

1961 ◽  
Vol 39 (6) ◽  
pp. 1184-1189 ◽  
Author(s):  
Denys Cook
Keyword(s):  
Complex Formation ◽  
Oxygen Atom ◽  
Carbonyl Group ◽  
Lewis Acid ◽  
Frequency Band ◽  
Infrared Spectra ◽  
Donor Site ◽  
Carbonyl Oxygen ◽  
Acid Strength ◽  
Group A

The infrared spectra of 2,6-dimethyl-4-pyrone in solution, and in complexes with HgCl2, ZnCl2, BF3, SbCl5, and HBr have been recorded. A band at 1639 cm−1 in the free pyrone moves to progressively lower frequencies in the complexes as the Lewis acid strength increases, identifying this band as the carbonyl stretching frequency and the donor site as the carbonyl group. A higher-frequency band, at 1678 cm−1 in the free pyrone, moves to lower frequency on complex formation, but to a much smaller extent, and is to be identified with a stretching mode of the ring. The site of protonation in 2,6-dimethyl-4-pyrone salts has been unequivocally shown to be the carbonyl oxygen atom.

Vibrational spectroscopic studies and normal coordinate analyses of TiCl4 donor-acceptor complexes

1974 ◽  
Vol 27 (9) ◽  
pp. 1855 ◽  
Author(s):  
RP Cooney ◽  
DB Fraser
Keyword(s):  
Raman Spectrum ◽  
Spectral Data ◽  
Infrared Spectra ◽  
Spectroscopic Studies ◽  
Normal Coordinate ◽  
Laser Raman ◽  
Laser Raman Spectra ◽  
Donor Acceptor ◽  
Nitrogen Heteroatom ◽  
Octahedral Configuration

Laser Raman spectra and infrared spectra are reported for TiCl4,2MeCN, TiCl4,2PhCN, TiCl4,2py, TiBr4,2MeCN. For purposes of comparison the Raman spectrum of SnC14,2Ph3P has been recorded and assigned. Analysis of data indicates that a cis octahedral configuration is adopted by the TiC14,2L complexes and a trans configuration by SnCl4,2Ph3P. In addition a new complex, 3TiC14,4cpy, has been prepared and spectral data indicate the ligand bonds through its nitrogen heteroatom. Normal coordinate analyses and Urey-Bradley force constants are reported for TiC14,2MeCN and TiCl4,- 2PhCN.

Metal Halide Ammines. III. Thermal Analyses and Calorimetry of Fluorosilicate Ammines and Hydrates of Bivalent Metals. Infrared Spectra of the Ammines

1975 ◽  
Vol 53 (16) ◽  
pp. 2426-2429 ◽  
Author(s):  
Kashinath C. Patil ◽  
Etalo A. Secco
Keyword(s):  
Spectral Data ◽  
Infrared Spectra ◽  
Thermal Analyses ◽  
Calorimetric Data ◽  
Ammonia Loss ◽  
Bivalent Metal ◽  
Decomposition Reactions ◽  
Infrared Spectral ◽  
Bivalent Metals ◽  
And Calorimetry

Bivalent metal fluorosilicate ammines have been prepared. The thermal analyses of the dodecammines reveal the decomposition to occur via the pentammine and/or tetrammine. The final ammonia loss is concomitant with fluorosilicate decomposition. Calorimetric data are given for the decomposition reactions. Some fluorosilicate hydrates are included for comparison purposes.The infrared spectral data of the ammines are presented with their assignments.

Metal Halide Ammines. II. Thermal Analyses, Calorimetry and Infrared Spectra of Fluoride Ammines and Hydrates of Bivalent Metals

1972 ◽  
Vol 50 (4) ◽  
pp. 567-573 ◽  
Author(s):  
K. C. Patil ◽  
E. A. Secco
Keyword(s):  
Spectral Data ◽  
Infrared Spectra ◽  
Thermal Analyses ◽  
Metal Halide ◽  
Metal Fluoride ◽  
Bivalent Metal ◽  
Calorimetric Measurements ◽  
Infrared Spectral ◽  
Bivalent Metals ◽  
Experimental Values

Thermal analyses of bivalent metal fluoride ammines reveal that decomposition occurs in two or more steps. Calorimetric measurements along with related enthalpic values of the various decomposition steps are given.The infrared spectral data of the ammines and hydrates are compared with theoretical and some experimental values already in the literature.

scholarly journals Vibrational Mode Coupling to Reverse Electron Transfer in (CN)5FeCNRu(NH3)5− in Solution

1999 ◽  
Vol 19 (1-4) ◽  
pp. 385-387
Author(s):  
Chengfei Wang ◽  
Boris Akhremitchev ◽  
Gilbert C. Walker
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Spectral Data ◽  
Infrared Spectra ◽  
High Frequency ◽  
Mode Coupling ◽  
Vibrational Mode ◽  
Time Resolved ◽  
Reverse Electron Transfer ◽  
Infrared Spectral

We present charge transfer absorption, resonance Raman and time-resolved infrared spectral data for (CN)5FeCNRu(NH3)5− in various solvents. The transient infrared spectra and anisotropies reveal both non-equilibrium vibrational populations of high frequency modes and local solvent heating.

scholarly journals Removal of Etalon Features in the Far-Infrared–Terahertz Transmittance Spectra of Thin Polymer Films

2020 ◽  
Vol 74 (12) ◽  
pp. 1530-1539
Author(s):  
Ulrich Schade ◽  
Dawei Cao ◽  
Ljiljana Puskar ◽  
Eglof Ritter ◽  
Jörg Beckmann
Keyword(s):  
Infrared Spectra ◽  
Polymer Films ◽  
Far Infrared ◽  
Thin Polymer Films ◽  
Model Calculations ◽  
Mid Infrared ◽  
Thin Polymer ◽  
Infrared Spectral ◽  
Total Transmittance ◽  
Far Infrared Spectra

Etalon features in infrared spectra of stratified samples, their influence on the interpretation, and methods to circumvent their presence in infrared spectra have been in discussion for decades. This paper focuses on the application of a method originally developed to remove interference fringes in the mid-infrared spectra for far-infrared Fourier transform spectroscopy on thin polymer films. We show that the total transmittance reflectance technique, commonly used for mid-infrared, also works successfully in the far-infrared spectral range where other approaches fail. Experimental spectra obtained by such technique are supported by model calculations and reveal the possibility and limits to obtain almost undisturbed far-infrared spectra which are suitable to determine low-energy vibrations of ionomer salts under certain sample conditions.

Sign in / Sign up

Export Citation Format

Share Document