Infrared Spectra, Molecular Weights, and Molecular Association of Chlorophyllsaandb,Methyl Chlorophyllides, and Pheophytins in Various Solvents

1963 ◽  
Vol 85 (23) ◽  
pp. 3801-3809 ◽  
Author(s):  
J. J. Katz ◽  
G. L. Closs ◽  
F. C. Pennington ◽  
M. R. Thomas ◽  
H. H. Strain
Keyword(s):  
Infrared Spectra ◽  
Molecular Association ◽  
Molecular Weights

The νCO absorption of ketones in cooled solution

1976 ◽  
Vol 54 (1) ◽  
pp. 31-36 ◽  
Author(s):  
J. Weinman ◽  
M. Mailloux ◽  
S. Weinman
Keyword(s):  
Infrared Spectra ◽  
Molecular Association ◽  
Lower Frequencies

The infrared spectra of diluted solutions of acetone, acetone-d6, cyclopentanone, cyclopentanone-d4, and cyclohexanone have been measured in the C=O stretching region from 290 to 90 K. As the solutions are cooled, several new bands appear at lower and lower frequencies. An interpretation of these spectra is given in terms of molecular association and anharmonic resonances.

Organobismuth compounds. I. Studies on triphenylbismuth(V) derivatives, Ph3BiX2

1970 ◽  
Vol 48 (16) ◽  
pp. 2488-2493 ◽  
Author(s):  
R. G. Goel ◽  
H. S. Prasad
Keyword(s):  
Molecular Weight ◽  
Infrared Spectra ◽  
Molecular Species ◽  
Structural Features ◽  
Molecular Weights ◽  
Electrical Conductances ◽  
Conductance Data ◽  
Chemical Constitution ◽  
Derivatives Of ◽  
Coordinate Structures

Triphenylbismuth(V) acid derivatives of the type, Ph3BiX2, where X = halide, nitrate, cyanate, acetate, haloacetate, or cyanoacetate have been prepared. Infrared spectra (4000 to 200 cm−1 region), electrical conductances, and molecular weights of these compounds have been studied to elucidate their structural features and chemical constitution. The molecular weight and conductance data show that these compounds behave as molecular species in benzene or nitromethane. The infrared spectroscopic results also indicate non-ionic five-coordinate structures. Bi—X stretching frequencies have been assigned for the difluoride, dichloride, dinitrate, dicyanate, and diacetate. These frequencies occur in the region 410–240 cm−1.

The Infrared Spectra of Some 1-(2-Thienyl)-3- and -4-Thiaalkanes

1979 ◽  
Vol 33 (6) ◽  
pp. 578-581
Author(s):  
Norman G. Foster ◽  
Bernice B. Bonner ◽  
Robert W. Higgins
Keyword(s):  
Absorption Band ◽  
Infrared Spectra ◽  
Thiophene Ring ◽  
Absorption Bands ◽  
Characteristic Absorption ◽  
Molecular Weights ◽  
Ring Compounds ◽  
Major Absorption Band

The infrared spectra of six 1-(2-thienyl)-3-thiaalkanes and seven 1-(2-thienyl)-4-thiaalkanes (molecular weights from 186 to 270) were obtained for the 4000 to 400 cm−1 range. These spectra are compared with spectra of other thiophene ring compounds substituted in the 2-position for their characteristic absorption bands. The spectra agree with other spectra as to the major absorption band around 680 cm−1 and the 2-substitution overtone pattern. A method of distinguishing between the two groups of compounds from moderate peaks in the 600 to 500 cm−1 (KBr) region is shown. Interference from the 2-alkylthiophenes and the 1-(2-thienyl)-1-thiaalkanes does not occur.

Aluminium(III) Derivatives of Monofunctional Bidentate Schiff Bases

1973 ◽  
Vol 28 (3-4) ◽  
pp. 153-157 ◽  
Author(s):  
R. N. Prasad ◽  
J. P. Tandon
Keyword(s):  
Schiff Base ◽  
Ir Spectra ◽  
General Formula ◽  
Schiff Bases ◽  
Molecular Association ◽  
Molecular Weights ◽  
Schiff Base Derivatives ◽  
Stoichiometric Ratios ◽  
Derivatives Of

Reactions of aluminium iso-propoxide with monofunctional bidentate Schiff bases having the general formula 2-HOC10H6CH:NR (where R = C2H5, n C3H7, iso-C3H7, n-C4H9, iso-C4H9, sec-C4H9, tert-C4H9 and C6H5) in different stoichiometric ratios have yielded Al(OPri)2(SB), Al(OPri)(SB)2 and Al(SB)3 type of products (where SB is the anion of the corresponding Schiff base, SBH). The ebullioscopic determination of molecular weights shows that the di-iso-propoxy mono- Schiff base derivatives are dimeric; the tris- Schiff base derivatives are monomeric and for the mono-iso-propoxy bis- Schiff base derivatives, molecular association is ~1.4. The IR spectra of a few representative derivatives have been recorded and possible structures indicated.

Coordination compounds of substituted 1,10-Phenanthrolines and related dipyridyls. VIII. Complexes of silver and 2,9-Dimethyl-1,10-phenanthroline

1965 ◽  
Vol 18 (9) ◽  
pp. 1345 ◽  
Author(s):  
JR Hall ◽  
RA Plowman ◽  
HS Preston
Keyword(s):  
Aqueous Solutions ◽  
Organic Solvents ◽  
Infrared Spectra ◽  
Coordination Compounds ◽  
Molecular Weights ◽  
Low Solubility ◽  
Covalently Bound

Addition of 2,9-dimethyl-1,10-phenanthroline (dmp) in organic solvents to aqueous solutions of silver(1) salts yielded mono complexes represented by AgXdmp, where X = NO3, Cl, Br, I; 2X = SO4, and bis complexes Ag(dmp),Y, where Y = NO3, Cl04. Water of crystallization was present only in the sulphate. The mono complexes were empirically three-coordinate. Low solubility prevented the determination of molecular weights. Infrared spectra indicated that the polyatomic anions were covalently bound. The 1 : 1 electrolyte [Ag(dmp)(py)]ClO4 subsequently prepared seemed to be an example of three-coordination. The bis complexes were 1 : 1 electrolytes in nitrobenzene and were most likely tetrahedral.

Organic compounds of gallium. III. Reactions of gallium alkoxides with acetylacetone, ethyl acetoacetate, methyl acetoacetate, and methyl salicylate

1969 ◽  
Vol 47 (14) ◽  
pp. 2661-2663 ◽  
Author(s):  
R. C. Mehrotra ◽  
S. R. Bindal
Keyword(s):  
Organic Compounds ◽  
Organic Solvents ◽  
Infrared Spectra ◽  
Ethyl Acetoacetate ◽  
Methyl Salicylate ◽  
Methyl Acetoacetate ◽  
Reduced Pressure ◽  
Molecular Weights ◽  
Molar Ratios ◽  
Derivatives Of

Derivatives of gallium of the type: Ga(i-C3H7O)3−xligx (x = 1, 2, or 3; and H lig = acetylacetone, methyl and ethyl acetoacetate, or methyl salicylate) have been synthesized by reacting gallium alkoxides with ligands in various molar ratios. The compounds are soluble in organic solvents and could be volatilized under reduced pressure. Their molecular weights have been determined ebullioscopically. The infrared spectra of some of the compounds have been studied.

Studies in the stereochemistry of zinc(II). IV. Complexes of zinc halides with heterocyclic bases

1966 ◽  
Vol 19 (10) ◽  
pp. 1801 ◽  
Author(s):  
DP Graddon ◽  
KB Heng ◽  
EC Watton
Keyword(s):  
Solid State ◽  
Infrared Spectra ◽  
Free Base ◽  
Nitrobenzene Solution ◽  
Molecular Weights ◽  
Heterocyclic Bases

Complexes of zinc halides with heterocyclic bases of the types ZnX2B2, ZnX2B3, and ZnX2B4 have been prepared, where X = Cl, Br, I, or NCS and B = pyridine, 4-methylpyridine, or 2-methylpyridine. Infrared spectra and isomorphous incorporation of cobalt(II) indicate that in the solid state these compounds are tetrahedral, 5-coordinate, and octahedral respectively. Molecular weights and conductivities in nitrobenzene solution show that the compounds ZnX2B3 and ZnX2B4 dissociate in solution to ZnX2B4 and free base.

Humic substances in swamps of the Myall Lakes region, N.S.W

Soil Research ◽  
1978 ◽  
Vol 16 (1) ◽  
pp. 41 ◽  
Author(s):  
DS Alderdice ◽  
BR Craven ◽  
W Creswick ◽  
WD Johnson
Keyword(s):  
Humic Substances ◽  
Humic Acids ◽  
Infrared Spectra ◽  
New South ◽  
New South Wales ◽  
Gel Permeation Chromatography ◽  
Molecular Weights ◽  
South Wales ◽  
Gel Permeation ◽  
Myall Lakes

Fulvic and humic acids have been extracted from swamp water and soil taken from the Myall Lakes area of New South Wales. Average molecular weights were estimated by gel permeation chromatography. Infrared spectra are presented.

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