METALLOPORPHYRINS. ELECTRONIC SPECTRA AND NATURE OF PERTURBATIONS. III. ABSORPTION SPECTRA AND SOLUTE-SOLVENT INTERACTIONS1a

1963 ◽  
Vol 67 (12) ◽  
pp. 2675-2679 ◽  
Author(s):  
Jean B. Allison ◽  
Ralph S. Becker
Keyword(s):  
Absorption Spectra ◽  
Electronic Spectra

Intermolecular interactions and electronic properties in phosphino-(oligothiophene) palladium(II) and platinum(II) complexes

2007 ◽  
Vol 85 (5) ◽  
pp. 383-391 ◽  
Author(s):  
Tracey L Stott ◽  
Michael O Wolf ◽  
Brian O Patrick
Keyword(s):  
Solid State ◽  
Metal Complexes ◽  
Electronic Properties ◽  
Crystal Structures ◽  
Structural Properties ◽  
Absorption Spectra ◽  
Intermolecular Interactions ◽  
Electronic Spectra ◽  
X Ray ◽  
Π Stacking

A series of Pt(II) and Pd(II) complexes containing diphenylphosphino-substituted oligothiophene ligands ranging from 1 to 3 thiophene rings in length have been prepared. Crystal structures of four of these complexes were determined via single X-ray crystal diffraction and the solid-state packing arrangements found to vary with both the metal and the thiophene-containing ligand. In some cases, π-stacking between thiophene rings are found for the oligothiophene ligands. Solution and solid-state absorption spectra of these complexes are reported.Key words: oligothiophenes, metal complexes, structural properties, electronic spectra.

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.

scholarly journals THE CHARACTERISTIC FEATURES OF THE ELECTRONIC ABSORPTION SPECTRA AND ELEMENTAL COMPOSITION OF HUMIC ACIDS OF DIFFERENT TYPES AND TYPES OF PEAT KHANTY-MANSIYSK AUTONOMOUS OKRUG - YUGRA

2017 ◽  
Vol 13 (4) ◽  
pp. 7-16
Author(s):  
Evgeniy Mikhailovich Osnitsky ◽  
Oleg Stepanovich Kuzmenko ◽  
Ksenya Valeryevna Dobryakovа ◽  
Davyd Vladimirovich Boroday ◽  
Mikhail Petrovich Sartakov ◽  
...  
Keyword(s):  
Elemental Composition ◽  
Absorption Spectra ◽  
Humic Acids ◽  
Electronic Absorption ◽  
Electronic Spectra ◽  
Electronic Absorption Spectra ◽  
Middle Taiga ◽  
Taiga Zone ◽  
Extinction Coefficients ◽  
Characteristic Features

The article reveals the results of studies of the humic acids electronic spectra for various types and kinds of peat in the middle-taiga zone of Western Siberia (Khanty-Mansiysk Autonomous Okrug - Yugra). It was found that the increase in optical density is observed in samples of humic acids which were extracted from the peat with a high degree of decomposition (40-65 %). At the first approximation the interpretation of received electronic spectra gives reason to range humic acids in the order with increasing proportion of aromatic structures share in macromolecules in the following order: 1) peat humic acids having a degree of expansion from 0 to 35 % with the content of a large number of peat-forming plants, where the extinction coefficients vary from 0.039 to 0.054 or sphagnum peat with the same degree of decomposition with the sphagnum containing 95-100 %, where the extinction coefficients have values between 0.030 and 0.042; 2) humic acids of all types and kinds of peat with a degree up to 35 %, where the extinction coefficients are from 0.042 to 0.068; 3) humic acid of peats of all examined types and species with a degree of decomposition from 40 % to 65 %, where the extinction coefficients vary from 0.059 to 0.087. Although the method of electron spectroscopy is an important tool in the study of humification processes in peat, it has a limited informative value due to unresolved spectra. Thus, peat humic acids with various botanical composition and various degree of decomposition are characterized by similar absorption spectra in the visible area in the form of a monotone increasing of absorption in short wavelength interval and differ from each other only by the absorption intensity. Based on the obtained values of the electronic absorption spectra of the GK and the magnitudes of their degree of benzoindole (α), which are calculated by the results of elemental analysis, the obtained information about the ratio of aromatic and aliphatic fragments in the molecules of humic acids, i.e. the information about the structural organization of the molecule . For the conditions of the Khanty-Mansi Autonomous Okrug - Yugra in all samples of peat humic acids did not reveal the dependence of their elemental composition from the types of source of peat, from the peculiarities of their species caused by the location and the specifics of peat formation.

Electronic absorption spectra and dipole moments of diazafluoren-9-ones studied by the MIM, PPP, and CNDO/2 methods

1976 ◽  
Vol 54 (12) ◽  
pp. 1870-1874 ◽  
Author(s):  
Concetta Gandolfo ◽  
Giuseppe Buemi ◽  
Domenico Grasso ◽  
Salvatore Fasone
Keyword(s):  
Absorption Spectra ◽  
Satisfactory Agreement ◽  
Electronic Absorption ◽  
Electronic Spectra ◽  
Benzene Solution ◽  
Electronic Absorption Spectra ◽  
Dipole Moments ◽  
Theoretical Data ◽  
Uv Spectra

The electronic spectra of three diazafluoren-9-one isomers have been measured in cyclohexane solution and the results compared with those of 'molecules in molecules'(MIM) and PPP calculations. A satisfactory agreement between experimental and theoretical data has been found, and five π → π* transitions can be assigned to their uv spectra. For two compounds dipole moments in benzene solution have been measured and results are compared with theoretical values obtained by MIM and CNDO/2 calculations.

UV absorption spectra of DNA bases in the 350–190 nm range: assignment and state specific analysis of solvation effects

2019 ◽  
Vol 21 (41) ◽  
pp. 22782-22793 ◽  
Author(s):  
Marin Sapunar ◽  
Wolfgang Domcke ◽  
Nađa Došlić
Keyword(s):  
Absorption Spectra ◽  
Electronic Spectra ◽  
Electronic States ◽  
Polyatomic Molecules ◽  
Uv Absorption ◽  
Dna Bases ◽  
Challenging Problem ◽  
Uv Absorption Spectra ◽  
Specific Analysis ◽  
Nm Range

The theoretical assignment of electronic spectra of polyatomic molecules is a challenging problem that requires the specification of the character of a large number of electronic states.

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