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.

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.

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.

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.

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.

Hypercoordinate Diorganosilanes Featuring an 〈ONO〉 Tridentate Ligand. A Surprising EquilibriumBetween Penta- and Tetracoordination

2007 ◽  
Vol 62 (2) ◽  
pp. 225-234 ◽  
Author(s):  
Jörg Wagler ◽  
Erica Brendler
Keyword(s):  
Solid State ◽  
Chloroform Solution ◽  
Tridentate Ligand ◽  
Precursor Molecule ◽  
Pentacoordinate Silicon ◽  
Shift Reaction

The reaction of the tridentate ligand-precursor molecule 1, o-HO-p-MeO-C6H3-C(Ph)=N-(o-C6H4)-OH, with diorganodichlorosilanes Me2SiCl2, Ph2SiCl2 and PhAllSiCl2 yields pentacoordinate silicon complexes R,R′Si[o-O-p-MeO-C6H3-C(Ph)=N-(o-C6H4)-O] (2a′: R, R′ = Me; 2b: R, R′ = Ph; 2c: R = Ph, R′ = All). 2b and 2c have pentacoordinate silicon atoms in the solid state as well as in chloroform solution. Surprisingly, for 2a an isomer 2a′ with Si-tetracoordination is preferred in the solid state, while the Si-pentacoordinated isomer 2a may dominate in solution. The hypercoordinate allylsilane 2c with a C=X→Si moiety is stable in solution and does not undergo a 1,3-allyl-shift-reaction.

scholarly journals Far infrared spectra of solid state aliphatic amino acids in different protonation states

2010 ◽  
Vol 132 (11) ◽  
pp. 115105 ◽  
Author(s):  
Aurélien Trivella ◽  
Thomas Gaillard ◽  
Roland H. Stote ◽  
Petra Hellwig
Keyword(s):  
Amino Acids ◽  
Solid State ◽  
Infrared Spectra ◽  
Far Infrared ◽  
Far Infrared Spectra

scholarly journals Synthesis of a One-Dimensional Coordination Polymer of Nickel(II) Complex with a β-Oxodithioester Ligand

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Ricardo Rosas-Reyes ◽  
Yasmi Reyes-Ortega ◽  
T. Jesus Morales-Juarez ◽  
Virginia Gómez-Vidales ◽  
Ivan García-Orozco
Keyword(s):  
Solid State ◽  
Coordination Polymer ◽  
Elemental Analysis ◽  
Chloroform Solution ◽  
Magnetization Measurements ◽  
One Dimensional ◽  
H Nmr

Bis-[methyl-1-hydroxy-1-cyclopentene-2-dithiocarboxylate-O,S]nickel(II) 1 was prepared starting from methyl 2-hydroxycyclopent-1-encarbodithioate ligand (CPDT) and Ni(II), and catena-[(μ2-4,4′-Bipyril)-bis-(methyl-2-hydroxy-1-cyclopentene-2-dithiocarboxylate-O,S)]nickel(ΙΙ) 2 was prepared in good yields from 1 plus 4,4′-bipyridyl (bpy) by shish-kebab methodology. The structure of 1 was confirmed by FTIR, elemental analysis, 1H NMR, UV–vis in chloroform solution and in solid, XPS, and PXRD. Compound 2 was characterized by FTIR, elemental analysis, UV–vis in chloroform solution, and in solid, XPS, PXRD, ESR, and solid state magnetization measurements. The structure of the polymer was established mostly by PXRD, ESR, and magnetization.

Spectroscopic Studies with N-Chloroarylsulphonamides: IR and 1H, 13C and 23Na Nmr Spectra of Sodium Salts of N-Chloro-Mono- and Di-Substituted-Benzenesulphonamides, 4-X-C6H4SO2NANCl (X = H; CH3; C2H5; F; Cl; Br; I or NO2) and i-X, j-YC6H3SO2NANCl (i-X, j-Y = 2,3-(CH3)2; 2,4-(CH3)2; 2,5-(CH3)2; 2-CH3, 4-Cl; 2-CH3, 5-Cl; 3-CH3, 4-Cl; 2,4-Cl2 or 3,4-Cl2)

2003 ◽  
Vol 58 (1) ◽  
pp. 51-56 ◽  
Author(s):  
◽  
J. D. D’Souza ◽  
B. H. Arun Kumar
Keyword(s):  
Solid State ◽  
Chemical Shift ◽  
Infrared Spectra ◽  
Phenyl Ring ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Spectroscopic Studies ◽  
Sodium Salts ◽  
Experimental Chemical Shift ◽  
23Na Nmr

In an effort to introduce N-chloroarylsulphonamides of different oxydising strengths, sixteen sodium salts of N-chloro-mono- and di-substituted benzenesulphonamides of the configuration, 4- X-C6H4SO2NaNCl (where X = H; CH3; C2H5; F; Cl; Br; I or NO2) and i-X, j-YC6H3SO2NaNCl (where i-X, j-Y = 2,3-(CH3)2; 2,4-(CH3)2; 2,5-(CH3)2; 2-CH3,4-Cl; 2-CH3,5-Cl; 3-CH3,4-Cl; 2,4- Cl2 or 3,4-Cl2) are prepared, characterized through their infrared spectra in the solid state and NMR spectra in solution. The υN-Cl frequencies vary in the range 950 - 927 cm−1. Effects of substitution in the benzene ring in terms of electron donating and electron withdrawing groups have been considered, and conclusions drawn. The chemical shifts of aromatic protons and carbon-13 in all the N-chloroarylsulphonamides have been calculated by adding substituent contributions to the shift of benzene. Considering the approximation employed the agreement between the calculated and experimental chemical shift values for different protons or carbon-13 is quite good. Effects of phenyl ring substitution on chemical shift values of both 1H and 13C are also graphically represented in terms of line diagrams.

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