Tautomerism of pyrazolidine-3,5-diones. II. Infrared spectra

1977 ◽  
Vol 30 (2) ◽  
pp. 421 ◽  
Author(s):  
M Woodruff ◽  
JB Polya
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectroscopy ◽  
Solid State ◽  
Infrared Spectra ◽  
Chloroform Solution ◽  
Predominant Form

The tautomerism of a number of N1- and N1,N2-substituted monotriazolylpyrazolidine-3,5-diones and their phenyl analogues has been examined by infrared spectroscopy. The diketo tautomer is the predominant form, both in the solid state and in chloroform solution. Monosodium salts of 4,4-dialkyl-1-triazolylpyrazolidinediones show unusual absorption which indicates strong hydrogen bonding in the compounds; a three-centre hydogen bond is proposed to explain the observed spectra.

Low-temperature infrared studies of some acid–base reactions

1983 ◽  
Vol 61 (9) ◽  
pp. 2077-2088 ◽  
Author(s):  
Theresa Huston ◽  
I. C. Hisatsune ◽  
Julian Heicklen
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectroscopy ◽  
Low Temperature ◽  
Infrared Spectra ◽  
Acid Base ◽  
Reaction Systems ◽  
Solid States ◽  
Infrared Studies

Low-temperature infrared spectroscopy has been used to examine the systems NH3 + H2O, NH3 + HCl, H2O + HCl, NH3 + HNO3, and NH2OH + HNO3. Hydrogen-bonding in the solid states greatly reduces the reactivities in these systems. Temperatures where reactions initiated in the systems NH3(s) + HCl(g), HNO3(s) + NH3(g), H2O(s) + HCl(g), and NH2OH(s) + HNO3(s) were, respectively, −145, −130, −127, and −125 °C. Infrared spectra of 2NH3•H2O, NH3•H2O, NH4Cl•3NH3, NH4NO3•3NH3, NH4NO3•2HNO3, NH2OH2+NO3−, NH3OH+NO3−, H3O+Cl−, H5O2+Cl−, and H5O2+Cl−•H2O have been identified in these reaction systems.

The influence of hydrogen bonding on the character of N—H and C=O stretching modes in 2-thiopyrrole-1,2-dicarboximide

1984 ◽  
Vol 62 (9) ◽  
pp. 1845-1849 ◽  
Author(s):  
Shanker Ram
Keyword(s):  
Hydrogen Bonding ◽  
Transition Temperature ◽  
Solid State ◽  
Hydrogen Bonds ◽  
Spectral Data ◽  
Infrared Spectra ◽  
Cyclic Dimer ◽  
Dilute Solutions ◽  
Two Phases ◽  
Thermodynamical Functions

The infrared spectra (200–4000 cm−1) of 2-thiopyrrole-1,2-dicarboximide (TPH) in solid and solution forms have been measured as a function of temperature, and a direct correlation has been obtained between the two phases and the type and extent of hydrogen bonding. It is suggested that TPH exists as cyclic dimer in the solid state (below 310 K) and in dilute solutions by the formation of two equivalent hydrogen bonds. At the transition temperature, ~310 K, the cyclic dimer undergoes to the open-cyclic dimer and persists in this structure till 410 K. In addition, the thermodynamical functions ΔH0, and ΔS0 have been estimated using the spectral data in solution.

Organoantimony compounds. II. Studies on tetraphenylantimony(V) derivatives

1969 ◽  
Vol 47 (24) ◽  
pp. 4607-4612 ◽  
Author(s):  
R. G. Goel
Keyword(s):  
Solid State ◽  
Infrared Spectra ◽  
Chloroform Solution ◽  
The Other ◽  
Molecular Weights ◽  
Electrical Conductances ◽  
Electrical Conductivities ◽  
Chemical Constitution ◽  
Coordinate Structures

Tetraphenylantimony halides, pseudohalides, carboxylates, nitrate, sulfate, selenate, and chromate have been synthesized. The infrared spectra, molecular weights, and electrical conductances of these compounds have been investigated to elucidate the chemical constitution. The compounds have molecular, monomeric constitution in benzene solutions. Infrared results indicate that with the exception of the acetate and the oxalate, all the compounds have 5-coordinate structures. The acetate is 6-coordinate in the solid state and 5-coordinate in bromoform or chloroform solution. The oxalate is indicated to be 6-coordinate in the solid state as well as in chloroform solution. The electrical conductivities of the bromide, chloride, thiocyanate, trifluoroacetate, and the nitrate in nitromethane correspond to those of 1:1 electrolyte. The conductivities of the other compounds indicate little dissociation in this solvent.

scholarly journals Wasserstoffbrückenbindungen im 7-Azaindol und im 1-Azacarbazol / Hydrogen Bonding in 7-Azaindole and 1-Azacarbazole

1976 ◽  
Vol 31 (11) ◽  
pp. 1391-1393 ◽  
Author(s):  
P. Stäglich ◽  
M. Zander
Keyword(s):  
Hydrogen Bonding ◽  
Solid State ◽  
Infrared Spectra ◽  
Fermi Resonance ◽  
Band Splitting ◽  
Stretching Vibrations

Abstract Hydrogen Bonding in 7-Azaindole and 1-Azacarbazole Infrared spectra of 7-azaindole, 1-azacarbazole, and their N-deuterated species have been measured in the solid state and in solution. Complicated band splitting observed in the region of 3000 cm-1 is explained by interaction of the N-H stretching vibrations of the cyclic dimers with different overtone and combination vibrations due to Fermi resonance.

THE INFRARED SPECTRA OF SOME CYCLIC MALONATES

1959 ◽  
Vol 37 (2) ◽  
pp. 361-365 ◽  
Author(s):  
R. A. Abramovitch
Keyword(s):  
Solid State ◽  
Infrared Spectra ◽  
Chloroform Solution ◽  
Cyclic Ester ◽  
Carbonyl Groups ◽  
Open Chain ◽  
Vibrational Coupling ◽  
Enolic Form ◽  
Cyclic Esters ◽  
Isopropylidene Malonate

The infrared spectra of isopropylidene malonate and some of its derivatives have been examined and compared with those of open-chain malonate esters and of 5,5-dimethylcyclohexane-1,3-dione. Two bands in the carbonyl stretching region are attributed to vibrational coupling of the carbonyl groups in the cyclic esters. There is no evidence that isopropylidene malonate exists in the enolic form either in the solid state or in chloroform solution. This cyclic ester structure for "Meldrum's acid" is thus confirmed.

X-ray Structure Refinement and Vibrational Spectroscopy of Ca8Gd2 (PO4)6 O2

2013 ◽  
Vol 12 (10) ◽  
pp. 719-726
Author(s):  
R. Ayadi ◽  
Mohamed Boujelbene ◽  
T. Mhiri
Keyword(s):  
Solid State ◽  
General Formula ◽  
Vibrational Spectroscopy ◽  
Powder Diffraction ◽  
Infrared Spectra ◽  
Solid State Reaction ◽  
Structure Refinement ◽  
Unit Cell ◽  
Cell Group ◽  
X Ray

The present paper is interested in the study of compounds from the apatite family with the general formula Ca10 (PO4)6A2. It particularly brings to light the exploitation of the distinctive stereochemistries of two Ca positions in apatite. In fact, Gd-Bearing oxyapatiteCa8 Gd2 (PO4)6O2 has been synthesized by solid state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents is0.3333 in Gd and 0.3333 for Ca in the Ca(1) position and 0. 5 for Gd in the Ca (2) position.  Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit-cell group analyses.

scholarly journals Probing the Hydrogen-Bonding Environment of Individual Bases in DNA Duplexes with Isotope-Edited Infrared Spectroscopy

2021 ◽  
Author(s):  
Robert J. Fick ◽  
Amy Y. Liu ◽  
Felix Nussbaumer ◽  
Christoph Kreutz ◽  
Atul Rangadurai ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectroscopy ◽  
Dna Duplexes

Transition metal acetates

1968 ◽  
Vol 46 (22) ◽  
pp. 3443-3446 ◽  
Author(s):  
D. A. Edwards ◽  
R. N. Hayward
Keyword(s):  
Solid State ◽  
Thermogravimetric Analysis ◽  
Transition Metal ◽  
Infrared Spectra ◽  
Magnetic Moments ◽  
Acetate Group ◽  
Visible Spectra

Some anhydrous transition metal acetates (Mn(II), Co(II), Cu(II), Ni(II), Zn(II), Ag(I), Mo(II), Ce(III), La(III)) have been prepared and their infrared spectra measured in the solid state. The infrared spectra have been related to established modes of bonding of the acetate group to metals. Thermal decompositions of the anhydrous acetates have been investigated by thermogravimetric analysis; magnetic moments and visible spectra have been measured.

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