Co(II) complexes with 2-pyrrolidinone

1969 ◽  
Vol 47 (10) ◽  
pp. 1689-1693 ◽  
Author(s):  
O. Bohunovsky ◽  
S. C. Jain ◽  
R. Rivest
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Infrared Spectra ◽  
Electronic Spectra ◽  
Cobalt Complexes ◽  
Acetone Solution ◽  
Probable Structure ◽  
Conductivity Measurements ◽  
Infrared Study ◽  
Boron Trichloride

For the known complexes CoL3X2 (X = Cl, Br, and L = 2-pyrrolidinone) a more detailed infrared study was made. Together with the electronic spectra this study indicates dissociation of CoL2X3 into CoL2X2 + L in chloroform and acetone solution. The conductivity measurements and the molecular weight determinations also support dissociation. The probable structure in the solid state is [CoL3X]X. The new 1:1 compound of 2-pyrrolidinone with boron trichloride was prepared to confirm the conclusions made from the infrared spectra of the cobalt complexes.

AN INFRARED STUDY OF TRIMETHYLAMINE OXIDE, ITS HYDRATE, AND ITS HYDROCHLORIDE

1961 ◽  
Vol 39 (6) ◽  
pp. 1214-1220 ◽  
Author(s):  
Paul A. Giguère ◽  
David Chin
Keyword(s):  
Solid State ◽  
Electron Diffraction ◽  
Hydrogen Bonds ◽  
Infrared Spectra ◽  
Diffraction Data ◽  
Electron Diffraction Data ◽  
Infrared Study ◽  
X Ray ◽  
Trimethylamine Oxide ◽  
Molecular Compounds

The infrared spectra of trimethylamine oxide, its hydrate, and its hydrochloride in the solid state were measured over the range 300 to 3500 cm−1 to ascertain the nature of the bonds in these compounds. From the observed stretching frequencies, 937 cm−1 for N—O and 945 cm−1 for C—N, the corresponding bond lengths are calculated to be 1.44 and 1.50 Å in agreement with X-ray and electron diffraction data. Both these frequencies remain unchanged in the hydrate and the hydrochloride as could be expected for molecular compounds. However, in the hydrochloride most of the evidence points to an ionic constitution. In both the hydrate and the hydrochloride the hydrogen bonds are particularly strong presumably because of the formal charges.

scholarly journals Low-temperature infrared study of ammonium carbamate formation

1984 ◽  
Vol 62 (5) ◽  
pp. 945-948 ◽  
Author(s):  
C. Hisatsune
Keyword(s):  
Solid State ◽  
Low Temperature ◽  
Infrared Spectra ◽  
Low Temperatures ◽  
Hydrogen Ion ◽  
Ion Transfer ◽  
Infrared Study ◽  
Ammonium Carbamate

Two types of infrared spectra observed during the formation of ammonium carbamate [Formula: see text] from the reaction of NH3 and CO2 in the solid state at low temperatures have been re-examined. These spectra had been assigned previously to amorphous and crystalline ammonium carbamate but the present data suggest their origins to be [Formula: see text] and its unstable precursor (NH3)2CO2 in which CO2 is bent. Spectra of amorphous and crystalline ammonium carbamate have been distinguished by comparing the systems NH3/CO2 and NH3/CO2/H2O. Hydrogen ion transfer in the diammoniates occurred at about −80 °C for NH3/CO2 and about −40 °C for ND3/CO2.

Synthesis and Characterisation of Bis(η5-methylcyclopentadienyl) N-Aryl-dithiocarbamato Chloro Titanium(IV) Compounds

1979 ◽  
Vol 34 (7) ◽  
pp. 949-951 ◽  
Author(s):  
N. K. Kaushik ◽  
B. Bhushan ◽  
G. R. Chhatwal
Keyword(s):  
Molecular Weight ◽  
Magnetic Susceptibility ◽  
General Formula ◽  
Elemental Analysis ◽  
Electronic Spectra ◽  
Probable Structure ◽  
Ammonium N

Abstract Some bis(η5-methylcyclopentadienyl) N-aryl-dithiocarbamato chloro titanium(IV) compounds of the general formula η5-(Mecp)2Ti(S2CNRH)Cl (R = phenyl; o-, m- and p-tolyl; p-methoxy phenyl; o- and p-ethoxy phenyl; o-, m- and p-chlorophenyl; p-bromophenyl and p-iodophenyl groups) have been prepared by the reaction of bis(η5-methylcyclopentadienyl) titanium(IV) dichloride with ammonium N-aryl-dithiocarbamates. A study of the molecular weight, conductance, infrared and electronic spectra, and magnetic susceptibility in addition to elemental analysis has been carried out to throw some light on the probable structure of these derivatives

Diethyl lead dinitrate

1969 ◽  
Vol 47 (10) ◽  
pp. 1621-1626 ◽  
Author(s):  
D. Potts ◽  
A. Walker
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Thermogravimetric Analysis ◽  
Infrared Spectrum ◽  
Dimethyl Sulfoxide ◽  
Diethyl Ether ◽  
Lead Nitrate ◽  
Ultraviolet Spectroscopy ◽  
Conductivity Measurements ◽  
Dinitrogen Tetroxide

The reaction, at 0 °C, between tetra-ethyl lead and dinitrogen tetroxide in both nitromethane and diethyl ether as solvents has been studied. The product in both solvents is always diethyl lead dinitrate, the properties of which have been investigated and compared with both dimethyl tin dinitrate and triethyl lead nitrate. The infrared spectrum is consistent with covalent unidentate nitrate groups, while molecular weight and conductivity measurements indicate that the compound behaves essentially as a 1:2 electrolyte in water and dimethyl sulfoxide. Decomposition of diethyl lead dinitrate in solution and in the solid state is discussed with the aid of ultraviolet spectroscopy and thermogravimetric analysis.

The Collagenic Molecular Structural Unit of Solid State Complexes

1971 ◽  
Vol 29 ◽  
pp. 478-479
Author(s):  
Kenneth M. Richter ◽  
John A. Schilling
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Structural Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Naoh Treatment

The structural unit of solid state collagen complexes has been reported by Porter and Vanamee via EM and by Cowan, North and Randall via x-ray diffraction to be an ellipsoidal unit of 210-270 A. length by 50-100 A. diameter. It subsequently was independently demonstrated by us in dog tendon, dermis, and induced complexes. Its detailed morphologic, dimensional and molecular weight (MW) aspects have now been determined. It is pear-shaped in long profile with m diameters of 57 and 108 A. and m length of 263 A. (Fig. 1, tendon, KMnO4 fixation, Na-tungstate; Fig. 2a, schematic of unit in long, C, and x-sectional profiles of its thin, xB, and bulbous, xA portions; Fig. 2b, tendon essentially unmodified by ether and 0.4 N NaOH treatment, Na-tungstate). The unit consists of a uniquely coild cable, c, of ṁ 22.9 A. diameter and length of 2580-3316 A. The cable consists of three 2nd-strands, s, each of m 10.6 A.

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.

Circular dichroism and infrared study of β-turn formation in repeat peptides of elastin

1987 ◽  
Vol 52 (5) ◽  
pp. 1356-1361
Author(s):  
S. Abdel Rahman ◽  
M. Elsafty ◽  
A. Hattaba
Keyword(s):  
Circular Dichroism ◽  
Solid State ◽  
Ir Spectra ◽  
Chain Length ◽  
Room Temperature ◽  
Infrared Study ◽  
Feature Characteristic ◽  
C 50 ◽  
The Stability ◽  
Circular Dichroïsm

The conformation of elastin-like peptides Boc-Ala-Pro-Gly-Val-APEGM, Boc-Ala-Pro-Gly-Val-Gly-Val-APEGM, Boc-Ala-Pro-Gly-Val-Ala-Pro-Gly-Val-Gly-Val-APEGM, Boc-Ala-Pro-Gly-Val-Gly-Val-Ala-Pro-Gly-Val-Gly-Val-APEGM were examined in solution using circular dichroism at 30 °C, 50 °C, and 70 °C and in solid state by IR at room temperature. The studies show that the β-turn is a significant conformational feature for peptides under investigation in solution at 30 °C and 50 °C, but at 70 °C the tetra, hexa, and decapeptides show the CD feature characteristic of the β-structure while the dodecapeptide spectra show the presence of β-turn which indicates the stability of the β-turn at this chain length. The IR spectra show that in the solid state at room temperature all investigated peptides assume essentially a β-turn except the tetrapeptide which present evidence of antiparallel β-structure. The β-turn contribution in the IR spectra increases with the increase of the chain length of the peptide.

scholarly journals Paramagnetic solid-state NMR assignment and novel chemical conversion of the aldehyde group to dihydrogen ortho ester and hemiacetal moieties in copper(ii)- and cobalt(ii)-pyridinecarboxaldehyde complexes

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20216-20231
Author(s):  
Ayelén F. Crespi ◽  
Verónica M. Sánchez ◽  
Daniel Vega ◽  
Ana L. Pérez ◽  
Carlos D. Brondino ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Assignment ◽  
Cobalt Complexes ◽  
Chemical Conversion ◽  
Aldehyde Group ◽  
Ortho Ester ◽  
Complex Chemical ◽  
Chemical Functionalization

The complex chemical functionalization of the aldehyde group was elucidated in copper and cobalt complexes for 4- and 3-pyridinecarboxaldehyde ligands.

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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