LIGHT ABSORPTION STUDIES: PART XI ELECTRONIC ABSORPTION SPECTRA OF NITROBENZENES

1958 ◽  
Vol 36 (10) ◽  
pp. 1350-1361 ◽  
Author(s):  
W. F. Forbes
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Light Absorption ◽  
Electronic Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Electronic Interactions ◽  
Absorption Studies

The spectra of nitrobenzenes are discussed in terms of previously proposed hypotheses relating electronic interactions and ultraviolet absorption spectra.

LIGHT ABSORPTION STUDIES: PART XIII. THE ELECTRONIC ABSORPTION SPECTRA OF RING-SUBSTITUTED ANILINES

1958 ◽  
Vol 36 (10) ◽  
pp. 1371-1380 ◽  
Author(s):  
W. F. Forbes ◽  
I. R. Leckie
Keyword(s):  
Spectral Analysis ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Light Absorption ◽  
Electronic Absorption Spectra ◽  
Benzene Derivatives ◽  
Substituted Anilines ◽  
Electronic Interactions ◽  
Absorption Studies

A spectral analysis of benzene derivatives in terms of steric and electronic interactions is extended to ring-substituted anilines.

LIGHT ABSORPTION STUDIES: PART XV. THE ULTRAVIOLET ABSORPTION SPECTRA OF ANISOLES

1959 ◽  
Vol 37 (8) ◽  
pp. 1305-1314 ◽  
Author(s):  
J. C. Dearden ◽  
W. F. Forbes
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Atom ◽  
Absorption Spectra ◽  
Hydroxy Group ◽  
Light Absorption ◽  
Spectral Properties ◽  
Ultraviolet Absorption ◽  
Steric Interactions ◽  
Absorption Studies ◽  
Methoxy Groups

Anisoles, compared with phenols, possess similar spectral properties, except that properties determined mainly by the hydrogen atom of the hydroxy group are modified. In this way, comparison of the ultraviolet absorption spectra of phenols and anisoles permits, for example, the study of the spectral effects of hydrogen bonding and the study of steric interactions involving the hydroxy and methoxy groups.

LIGHT ABSORPTION STUDIES: PART II. ULTRAVIOLET ABSORPTION SPECTRA OF SUBSTITUTED BENZOIC ACIDS AND PHENYL BENZOATES

1955 ◽  
Vol 33 (12) ◽  
pp. 1829-1839 ◽  
Author(s):  
W. F. Forbes ◽  
M. B. Sheratte
Keyword(s):  
Absorption Spectra ◽  
Light Absorption ◽  
Ultraviolet Absorption ◽  
Steric Effects ◽  
Benzoic Acids ◽  
Absorption Studies ◽  
Substituted Benzoic Acids ◽  
Electronic And Steric Effects

The spectra of a number of substituted benzoic acids, acetanilides, and phenyl benzoates are discussed in terms of the electronic and steric effects of substituents.

LIGHT ABSORPTION STUDIES: PART XII. ULTRAVIOLET ABSORPTION SPECTRA OF BENZALDEHYDES

1958 ◽  
Vol 36 (10) ◽  
pp. 1362-1370 ◽  
Author(s):  
J. C. Dearden ◽  
W. F. Forbes
Keyword(s):  
Absorption Spectra ◽  
Light Absorption ◽  
Electronic Spectra ◽  
Spectral Properties ◽  
Ultraviolet Absorption ◽  
Benzene Derivatives ◽  
Formyl Group ◽  
Steric Interactions ◽  
Absorption Studies ◽  
Acetyl Group

The electronic spectra of benzaldehydes in the region 220–360 mμ are recorded and discussed in terms of previously stated hypotheses. The formyl group is shown to endow benzene derivatives with spectral properties similar to those of the acetyl group in acetophenones, except that steric interactions are slightly modified.

LIGHT ABSORPTION STUDIES: PART XVIII. THE ULTRAVIOLET ABSORPTION SPECTRA OF BROMOBENZENES

1961 ◽  
Vol 39 (5) ◽  
pp. 1131-1142 ◽  
Author(s):  
W. F. Forbes
Keyword(s):  
Spectral Data ◽  
Absorption Spectra ◽  
Light Absorption ◽  
Bromine Atom ◽  
Ultraviolet Absorption ◽  
Steric Effects ◽  
Benzene Derivative ◽  
Previous Part ◽  
Absorption Studies ◽  
Band Spectra

The ultraviolet absorption spectra of bromobenzene in various solvents, and the spectra of a series of substituted bromobenzenes in cyclohexane solution, are reported. The B-band spectral data confirm the hypotheses postulated for the B-band spectra of chlorobenzenes in the previous part of this series of papers. That is, the bromine atom usually gives rise to greater steric effects than the chlorine atom and the apparent mesomeric interaction as judged from these spectra increases with the size of the halogen substituent.Both bromobenzene and chlorobenzene C-band intensities are unusually small, and this is assumed to account for the frequent C-band similarity between the spectrum of a mono-substituted benzene derivative PhX, where X = OH, OCH3, NH2, and the spectrum of the corresponding chloro- or bromo-substituted PhX derivative.

LIGHT ABSORPTION STUDIES: PART XVI. THE ULTRAVIOLET ABSORPTION SPECTRA OF FLUOROBENZENES

1959 ◽  
Vol 37 (12) ◽  
pp. 1977-1985 ◽  
Author(s):  
W. F. Forbes
Keyword(s):  
Absorption Spectra ◽  
Light Absorption ◽  
Fluorine Atom ◽  
Ultraviolet Absorption ◽  
Mesomeric Effect ◽  
First Approximation ◽  
Absorption Studies

The ultraviolet absorption spectra of a series of fluorobenzenes are determined. It is found that as a first approximation a fluoro substituent does not appreciably affect the benzenoid absorption. The spectra are discussed on the assumption that the mesomeric effect of the fluorine atom is small.

Electronic absorption spectra for copper(II) polyamine complexes

1970 ◽  
Vol 23 (5) ◽  
pp. 981 ◽  
Author(s):  
GR Hedwig ◽  
JL Love ◽  
HKJ Powell
Keyword(s):  
Aqueous Solution ◽  
Field Strength ◽  
Absorption Spectra ◽  
Chain Length ◽  
Electronic Absorption ◽  
Thermodynamic Stability ◽  
Electronic Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Ligand Field ◽  
Nitrogen Donor

The preparations and visible and ultraviolet absorption spectra are reported for a series of copper(11) complexes with linear and cyclic aliphatic ligands which each have four nitrogen donor atoms. Data are compared with that for 16 analogous complexes. For linear polyamines of different chain length the ligand field strength, as denoted by vmax (visible), is found to increase with increasing thermodynamic stability of the copper(11) complex in aqueous solution. For linear and cyclic ligands the ligand field strength is a maximum for complexes containing a combination of five- and six-membered chelate rings.

LIGHT ABSORPTION STUDIES: PART XVII. THE ULTRAVIOLET ABSORPTION SPECTRA OF CHLOROBENZENES

1960 ◽  
Vol 38 (7) ◽  
pp. 1104-1112 ◽  
Author(s):  
W. F. Forbes
Keyword(s):  
Absorption Spectra ◽  
Chlorine Atom ◽  
Light Absorption ◽  
Fluorine Atom ◽  
Ultraviolet Absorption ◽  
Electronic Interaction ◽  
Mesomeric Effect ◽  
Spectral Changes ◽  
Absorption Studies ◽  
Solute Interactions

The ultraviolet absorption spectra of a series of chlorobenzenes are determined. The spectral data suggest that the apparent mesomeric effect of the chlorine atom is greater than that of the fluorine atom, that solvent–solute interactions are generally less important in chlorobenzenes than in fluorobenzenes, and that, as expected, the effective interference radius of the chlorine atom is large. Moreover, spectral changes in o-substituted chlorobenzenes are consistent with the assumption that maximum electronic interaction requires the chlorine atom to be in the same plane as the benzene ring. The conformations of o-chloroacetophenone and o-chlorophenol are briefly discussed.

LIGHT ABSORPTION STUDIES: PART XIX. THE ULTRAVIOLET ABSORPTION SPECTRA OF IODOBENZENES

1961 ◽  
Vol 39 (11) ◽  
pp. 2295-2305 ◽  
Author(s):  
W. F. Forbes
Keyword(s):  
Absorption Spectra ◽  
Light Absorption ◽  
Iodine Atom ◽  
Ultraviolet Absorption ◽  
The Other ◽  
Mesomeric Effect ◽  
Resonance Theory ◽  
Substituted Benzenes ◽  
Halogen Atoms ◽  
Absorption Studies

As a sequel to previous studies on the ultraviolet absorption spectra of halogen-substituted benzenes the spectra of iodobenzene in various solvents, and the spectra of a series of substituted iodobenzenes in cyclohexane solution, are reported. It is shown that these spectra can be rationalized qualitatively in terms of simple resonance theory, if the apparent mesomeric effect of the iodine atom is assumed to be greater for iodine than for the other halogen atoms.

Electronic Absorption Spectra of Benzylchloride Vapor

1969 ◽  
Vol 23 (6) ◽  
pp. 616-617 ◽  
Author(s):  
R. Ammini Amma ◽  
K. P. R. Nair ◽  
D. K. Rai
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Ultraviolet Absorption ◽  
The Other ◽  
Electronic Transitions ◽  
Near Ultraviolet ◽  
Two Systems ◽  
Quartz Spectrograph

The near-ultraviolet absorption spectra of benzylchloride vapor have been photographed on a medium quartz spectrograph. Two systems of bands have been observed, one at 37 115 cm−1 and the other at 41 748 cm−1, which correspond to B2 ↓ A1 and A1 ↓ A1 electronic transitions. The observed spectra have been analysed in terms of fundamentals and overtones.

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