THE ELECTRONIC SPECTRA OF CRYSTALLINE TOLUENE, DIBENZYL, DIPHENYLMETHANE, AND BIPHENYL IN THE NEAR ULTRAVIOLET

1958 ◽  
Vol 36 (1) ◽  
pp. 48-58 ◽  
Author(s):  
Robert Coffman ◽  
Donald S. McClure
Keyword(s):  
Single Crystals ◽  
Excited States ◽  
Electronic Absorption ◽  
Electronic Spectra ◽  
Weak Coupling ◽  
Electronic Absorption Spectra ◽  
Polarized Light ◽  
Near Ultraviolet ◽  
Benzene Rings ◽  
First Time

The electronic absorption spectra of single crystals of toluene, dibenzyl, diphenylmethane, and biphenyl have been photographed at 20 °K. using polarized light in the range 3000 to 2500 Å. The fluorescence spectrum of biphenyl has also been examined. This is the first time that the excited states of biphenyl analogous to the B2u state of benzene have been observed. The main features of the spectra are similar for all four compounds, and the differences may be understood in terms of the weak coupling between the benzene rings of the "double molecules".

Optical Spectroscopy of Mixed Metamagnetic FexCo1-xCl2 Crystals

1980 ◽  
Vol 35 (10) ◽  
pp. 1013-1019 ◽  
Author(s):  
Friedrich Seitz ◽  
Terence E. Wood ◽  
Peter Day
Keyword(s):  
Charge Transfer ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Absorption Spectra ◽  
Optical Spectroscopy ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Broad Band ◽  
Mixed Crystals ◽  
Magnetic Exchange

Abstract Electronic absorption spectra are reported for single crystals of composition FexCo1-xCl2 as a function of temperature from 300 K to 4 K. A broad band at 436 nm is assigned to Fe (II) → Co (II) charge transfer and the temperature dependence of its intensity is related to the magnetic exchange between the ions. The 2T1g(2H) excitation of Co (II) in the mixed crystals has an unusual temperature dependence which correlates with the Néel temperature.

Spectroscopic characterization of C7H3+ and C7H3˙: electronic absorption and fluorescence in 6 K neon matrices

2014 ◽  
Vol 16 (15) ◽  
pp. 7023-7030 ◽  
Author(s):  
Arghya Chakraborty ◽  
Jan Fulara ◽  
Rainer Dietsche ◽  
John P. Maier
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Spectroscopic Characterization ◽  
First Time

Electronic absorption spectra of mass-selected C7H3+ and C7H3˙ isomers in a neon matrix have been identified for the first time.

Synthesis and photophysical properties of zinc phthalocyanines substituted with quinolinoxy group

2009 ◽  
Vol 13 (12) ◽  
pp. 1206-1213 ◽  
Author(s):  
Jinping Xue ◽  
Lixuan Cai ◽  
Naisheng Chen ◽  
Jinling Huang
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Elemental Analysis ◽  
Fluorescence Spectra ◽  
Electronic Absorption Spectra ◽  
Photophysical Properties ◽  
Electronic Spectroscopy ◽  
Zinc Phthalocyanines ◽  
New Compounds ◽  
First Time

The synthesis of tetrasubstituted zinc phthalocyanines bearing quinolinoxy groups are reported for the first time. The new compounds have been characterized by elemental analysis, IR, MS and electronic spectroscopy. The photophysical properties, such as the electronic absorption spectra and fluorescence spectra, have also been investigated and discussed together with the influence of substituent position and organic solvents on these properties. The introduction of quinolinoxy group to the Pc ring was found to affect these photophysical properties to some extent.

LCAO MO Investigations on Lignin Model Compounds VI. CNDO/CI Calculations of Electronic Spectra of Cinnamaldehyde Structures

1978 ◽  
Vol 33 (1) ◽  
pp. 59-65 ◽  
Author(s):  
Milan Remko ◽  
Jan Polčin
Keyword(s):  
Electronic Absorption ◽  
Electronic Spectra ◽  
Electronic Absorption Spectra ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Transition Energies ◽  
Lignin Model ◽  
Ci Calculations ◽  
Good Agreement ◽  
Lcao Mo

The electronic absorption spectra of cinnamaldehyde, o-, m-, p-hydroxycinnamaldehyde and 3-methoxy-4-hydroxy cinnamaldehyde were theoretically and experimentally studied, by means of the semiempirical CNDO/CI method. The calculated and observed transition energies were in good agreement.

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.

Excited State Polarizability of Some Polycyclic Polyenes

2017 ◽  
Vol 68 (2) ◽  
pp. 307-310 ◽  
Author(s):  
Ana Maria Ciubara ◽  
Andreea Celia Benchea ◽  
Carmen Beatrice Zelinschi ◽  
Dana Ortansa Dorohoi
Keyword(s):  
Excited State ◽  
Absorption Spectra ◽  
Excited States ◽  
Electronic Absorption ◽  
Ground State ◽  
Electronic Absorption Spectra ◽  
Photon Absorption ◽  
Absorption Process ◽  
Polar Solvents ◽  
Molecular Parameters

The electronic absorption spectra of five polycyclic polyenes were recorded in non-polar solvents in order to determine their polarizability in excited states from the strength of the dispersive interactions in their diluted solutions. The bathochromic shifts of p-p* vibronic bands prove the increase of the molecular polarizabilty in the photon absorption process. Some molecular parameters of the analyzed polyenes in their ground state were computed by using the programs from Spartan�14.

Discotic liquid crystals of transition metal complexes 34: spectroscopic properties of bis[octakis(3,4-dialkoxy-phenoxy)phthalocyaninato]lutetium(III) complexes

2003 ◽  
Vol 07 (02) ◽  
pp. 105-111 ◽  
Author(s):  
Kazuaki Hatsusaka ◽  
Kazuchika Ohta
Keyword(s):  
Thin Film ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Liquid Crystalline ◽  
Electronic Absorption Spectra ◽  
Solvent Polarity ◽  
Spectroscopic Properties ◽  
Temperature Dependent ◽  
First Time ◽  
Hexane Solution

Spectroscopic properties of discotic liquid crystalline bis[octakis(3,4-dialkoxyphenoxy)-phthalocyaninato]lutetium(III) complexes, {[( C n O )2 PhO ]8 Pc }2 Lu (n = 12: 2a and n = 13: 2b), were investigated by recording electronic absorption spectra in the region of 250-2600 nm under three different conditions; solution, mixed solvent solutions, and a thin film at various temperatures. An intermolecular charge transfer (CT) band was found at about 2000-2100 nm both for the n-hexane solution and the thin film. It was established for the first time from the solvent-polarity-dependent and temperature-dependent electronic absorption spectra that the intermolecular CT band is attributable to molecular aggregation.

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.

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