Dimethylgermanium Dinitrate

1971 ◽  
Vol 49 (2) ◽  
pp. 202-206 ◽  
Author(s):  
D. Potts ◽  
A. Walker
Keyword(s):  
Carbon Tetrachloride ◽  
Ethyl Acetate ◽  
Dimethyl Sulfoxide ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Conductivity Measurements ◽  
Alkyl Nitrates ◽  
Methyl Cyanide ◽  
Nitrogen Pentoxide ◽  
Group Iva

Dimethylgermanium dinitrate has been prepared by the reaction of dimethylgermanium dichloride and nitrogen pentoxide in carbon tetrachloride. The properties of this compound have been investigated and compared with those of other known Group IVA alkyl nitrates. The vibrational spectra show that the nitrato groups are covalently bound to the germanium in a unidentate manner. Ultraviolet spectra and conductivity measurements indicate that the compound behaves as a 1:2 electrolyte in water and dimethyl sulfoxide but is a non-electrolyte in methyl cyanide, nitromethane, and ethyl acetate. The complexes Me2Ge(NO3)2•py and Me2Ge(NO3)2•2,2′dipy have been prepared and the infrared spectra of these compounds indicate considerable weakening of the germanium-nitrato bonds.

Trimethylgermanium Nitrate

1971 ◽  
Vol 49 (12) ◽  
pp. 2171-2175 ◽  
Author(s):  
D. Potts ◽  
A. Walker
Keyword(s):  
Ethyl Acetate ◽  
Vibrational Spectra ◽  
Group Iv ◽  
Germanium Atom ◽  
Solution Properties ◽  
Conductivity Measurements ◽  
Alkyl Nitrates ◽  
Methyl Cyanide ◽  
Ultraviolet Spectra ◽  
Covalently Bound

The spectroscopic and solution properties of trimethylgermanium nitrate have been determined and compared with those of other known Group IV alkyl nitrates. The vibrational spectra show that the nitrato group is covalently bound to the germanium atom in a unidentate manner. Ultraviolet spectra and conductivity measurements indicate that the compound behaves as a 1:1 electrolyte in water and dimethylsulfoxide, but is a non-electrolyte in methyl cyanide, nitromethane, and ethyl acetate. Attempts to prepare methylgermanium trinitrate are also described.

Preparation and characterization of some methyl cyanide complexes of Cu(I), Cu(II), and Zn(II) fluorosulfates

1970 ◽  
Vol 48 (1) ◽  
pp. 75-79 ◽  
Author(s):  
J. B. Milne
Keyword(s):  
Infrared Spectrum ◽  
Infrared Spectra ◽  
Strong Interaction ◽  
Strong Association ◽  
Conductivity Measurements ◽  
Methyl Cyanide ◽  
Cyanide Complexes

Tetrakis(methyl cyanide) complexes of Cu(I), Cu(II), and Zn(II) fluorosulfates have been prepared by reactions of anhydrous Cu(II) and Zn(II) fluorosulfates in methyl cyanide. The infrared spectra indicate a strong interaction between the fluorosulfate anion and the complex Cu(II) and Zn(II) cations. Conductivity measurements in methyl cyanide show strong association between the fluorosulfate anion and the dipositive cations. The Cu(I) compound is completely dissociated in methyl cyanide and, according to the infrared spectrum, shows no strong interaction with fluorosulfate anion.

The structures and vibrational spectra of methyl chloroformate and dimethyl carbonate

1966 ◽  
Vol 19 (9) ◽  
pp. 1637 ◽  
Author(s):  
B Collingwood ◽  
H Lee ◽  
JK Wilmshurst
Keyword(s):  
Carbon Tetrachloride ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Dimethyl Carbonate ◽  
Carbon Disulphide ◽  
Vapour Phase ◽  
Carboxylate Group ◽  
Infrared Band

The infrared spectra of methyl chloroformate and dimethyl carbonate in the vapour phase and as solutions in carbon disulphide and carbon tetrachloride have been obtained from 4000 to 400 cm-1 together with the Raman spectra of the liquids. The infrared band contours for both molecules are consistent with a cis configuration of the carboxylate group and the spectra may be interpreted satisfactorily on this basis.

Enthalpies of solution of naphthalene, N,N-dimethyl-1-naphthylamine, and 1,8-bis(dimethylamino)naphthalene in 16 organic solvents

1992 ◽  
Vol 70 (6) ◽  
pp. 1586-1589 ◽  
Author(s):  
Daniel Figeys ◽  
Maegorzata Koschmidder ◽  
Robert L. Benoit
Keyword(s):  
Carbon Tetrachloride ◽  
Ethyl Acetate ◽  
Dimethyl Sulfoxide ◽  
Organic Solvents ◽  
Enthalpies Of Solution ◽  
Proton Sponge ◽  
Solvent Interactions ◽  
Linear Relationships

The enthalpies of solution of naphthalene, N,N-dimethyl-1-naphthylamine, and 1,8-bis(dimethylamino)naphthalene (proton sponge) were determined at 298.15 K in 16 organic solvents (n-hexane, cyclohexane, carbon tetrachloride, chloroform, 1,2-dichloroethane, benzene, chlorobenzene, dimethyl sulfoxide, N,N-dimethylformamide, ethyl acetate, 1,4-dioxane, anisole, nitrobenzene, benzonitrile, methanol, ethanol). Additional determinations were made with benzene. Useful linear relationships are observed between the molar enthalpies of solution of the four compounds in the solvents. The molar enthalpies of solution were correlated with the solvatochromic parameter of the solvents. The presence of N(CH3)2 groups on naphthalene does not significantly contribute to the solute–solvent interactions.

Vibrational Spectra of Several Lanthanide Tris-2,2,6,6-tetramethyl-3,5-heptanedionates

1972 ◽  
Vol 26 (2) ◽  
pp. 251-256 ◽  
Author(s):  
Hsien-Yu Lee ◽  
Forrest F. Cleveland ◽  
Joseph S. Ziomek ◽  
Frank Jarke
Keyword(s):  
Group Theory ◽  
Carbon Tetrachloride ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Far Infrared ◽  
Infrared Region ◽  
Carbon Tetrachloride Solution ◽  
Powder Samples ◽  
Disk Method

The Raman spectra of La-, Pr-, and Gd(DPM)3 [Gd-tris-2,2,6,6-tetramethyl-3,5-heptanedionate] were measured at 300°K with powder samples in the region 3000–100 cm−1. An attempt also was made to obtain the Raman spectra of La-, Ce-, Pr-, Nd-, and Gd(DPM)3 in carbon tetrachloride solution, but no Raman lines for these compounds were found. The undisplaced mercury lines observed were unusually strong. This may have been caused by the photodecomposition of M (DPM)3 in carbon tetrachloride solution by exposure to the light. The infrared spectra of La-, Ce-, Pr-, Nd-, and Gd(DPM)3 were obtained in the region 4000–300 cm−1 by the KBr disk method at 300°K. For La-, Nd-, and Gd(DPM)3, the absorption spectra were measured in the far-infrared region (660–76 cm−1) by use of the polyethylene disk method at 300 and 77 °K. Assignments of the vibrational frequencies were made on the bases of the group theory selection rules and group frequencies, and these were compared with the known assignments of tris-(acetylacetonato) lanthanide (III) complexes for most of the bands.

HSCCC Separation of Three Main Compounds from the Crude Extract of Dracocephalum Tanguticum by Using Dimethyl Sulfoxide as Cosolvent

2020 ◽  
Author(s):  
Xue Yang ◽  
Yongling Liu ◽  
Tao Chen ◽  
Nana Wang ◽  
Hongmei Li ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Ethyl Acetate ◽  
Dimethyl Sulfoxide ◽  
Efficient Method ◽  
Crude Extract ◽  
High Speed ◽  
Glacial Acetic Acid ◽  
Butyl Alcohol ◽  
Preparative Hplc ◽  
Counter Current

Abstract Separation of natural compounds directly from the crude extract is a challenging work for traditional column chromatography. In the present study, an efficient method for separation of three main compounds from the crude extract of Dracocephalum tanguticum has been successfully established by high-speed counter-current chromatography (HSCCC). The crude extract was directly introduced into HSCCC by using dimethyl sulfoxide as cosolvent. Ethyl acetate/n-butyl alcohol/0.3% glacial acetic acid (4: 1: 5, v/v) system was used and three target compounds with purity higher than 80% were obtained. Preparative HPLC was used for further purification and three target compounds with purity higher than 98% were obtained. The compounds were identified as chlorogenic acid, pedaliin and pedaliin-6″-acetate.

Infrared spectra of aqueous sodium benzoates and salicylates in the carboxyl-stretching region: chelation in aqueous sodium salicylates

1969 ◽  
Vol 47 (24) ◽  
pp. 4577-4588 ◽  
Author(s):  
G. E. Dunn ◽  
R. S. McDonald
Keyword(s):  
Salicylic Acid ◽  
Carbon Tetrachloride ◽  
Infrared Spectra ◽  
Aromatic Compounds ◽  
Deuterium Oxide ◽  
Substituent Effects ◽  
Good Evidence ◽  
Frequency Region ◽  
Aqueous Sodium ◽  
Substituent Constants

Infrared spectra in the frequency region 1300–1760 cm−1 are reported for 41 substituted sodium benzoates and 10 substituted sodium salicylates in deuterium oxide solution, and for 9 substituted salicylic acids in chloroform and carbon tetrachloride solutions. Carboxylate stretching frequencies of benzoates and salicylates correlate poorly with substituent constants, but the asymmetric frequencies of benzoates and salicylates correlate well with each other, and the asymmetric frequencies of benzoates correlate well with the asymmetric frequencies of the corresponding nitrobenzenes. It is suggested that, among substituted aromatic compounds, group vibrations which couple with the ring vibrations may correlate well with similar vibrations of other groups, but not with coupled vibrations of different symmetry, uncoupled vibrations, or substituent constants. Chelation in chloroform solutions of salicylic acid dimers can be detected by its influence on substituent effects, but infrared spectra provide no good evidence for chelation in aqueous sodium salicylates.

VIBRATIONAL SPECTRA OF SOME ALKYLARSONIUM COMPOUNDS

1965 ◽  
Vol 43 (12) ◽  
pp. 3193-3200 ◽  
Author(s):  
W. R. Cullen ◽  
G. B. Deacon ◽  
J. H. S. Green
Keyword(s):  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Vibrational Assignments

The infrared spectra of some tetramethyl-, tetraethyl-, and triethylmethyl-arsonium salts, and that of tetramethylstibonium triiodomercurate(II) have been recorded in the region 4 000 to 200 cm−1. Vibrational assignments are given for the quarternary 'onium cations, and comparisons are made with the spectra of alkylorganometallic compounds of germanium and tin.

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