ABSORPTION SPECTRA OF 2,5-DIMERCAPTO-1,3,4-THIADIAZOLE AND ITS METHYL DERIVATIVES

1960 ◽  
Vol 38 (9) ◽  
pp. 1439-1444 ◽  
Author(s):  
G. D. Thorn
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Region ◽  
Hypsochromic Shift ◽  
Tautomeric Forms ◽  
Methyl Derivatives

The absorption spectra of the three tautomeric forms of 2,5-dimercapto-1,3,4-thiadiazole have been determined by using the N- and S-methyl derivatives. In the ultraviolet region, a hypsochromic shift in absorption maxima is shown in the change from the dithionic to the thionic–thiolic and to the dithiolic forms. Strong bands in the infrared at 1508–1475 cm−1 and 1435–1415 cm−1 have been assigned to [Formula: see text]respectively.

The interactions of tensides with calconalide I

1991 ◽  
Vol 56 (10) ◽  
pp. 2100-2106
Author(s):  
Irena Němcová ◽  
Oldřich Valcl ◽  
Jiří Makovička
Keyword(s):  
Dissociation Constant ◽  
Absorption Spectra ◽  
Tautomeric Forms

A study was made of the effect of cationogenic, anionogenic and nonionogenic tensides on the absorption spectra and dissociation constant of calconalide I. It was found that the changes in the absorption spectra are a result of influences on the dissociation of the dye and a shift in the equilibrium between the tautomeric forms. The mechanism of the effect of the tenside on dye dissociation was also discussed.

The synthesis of the isomeric N-methyl derivatives of murexine

1981 ◽  
Vol 34 (8) ◽  
pp. 1739 ◽  
Author(s):  
CC Duke ◽  
JV Eichholzer ◽  
JK Macleod
Keyword(s):  
Imidazole Ring ◽  
The Other ◽  
Pharmacological Activities ◽  
Tautomeric Forms ◽  
Methyl Derivatives ◽  
Paramagnetic Ions ◽  
Nucella Emarginata ◽  
Derivatives Of

The two isomeric N-methyl derivatives of murexine have been synthesised by independent routes and shown to be different from an 'N- methylmurexine' reportedly isolated from the mollusc Nucella emarginata. 1H n.m.r. studies have shown a marked difference in the extent of binding to paramagnetic ions of the two N-methyl derivatives of murexine in water while pharmacological results show substantially different pharmacological activities of the two isomers. Both results can be rationalized in terms of the observed activities being associated with the presence of one or the other of the tautomeric forms of the imidazole ring.

Absorption spectra of volatile aromatic hydrocarbon films in the vacuum ultraviolet region

1982 ◽  
Vol 71 (1) ◽  
pp. 135-144 ◽  
Author(s):  
Shojun Hino ◽  
Tamás Veszprémi ◽  
Koichi Ohno ◽  
Hiroo Inokuchi ◽  
Kazuhiko Seki
Keyword(s):  
Aromatic Hydrocarbon ◽  
Absorption Spectra ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Region ◽  
Hydrocarbon Films ◽  
Vacuum Ultraviolet Region

Absorption spectra of alkali cyanide molecules in the vacuum-ultraviolet region: transitions to dissociative and predissociative states

1994 ◽  
Vol 98 (5) ◽  
pp. 1407-1410 ◽  
Author(s):  
Hisato Yasumatsu ◽  
Tamotsu Kondow ◽  
Kaoru Suzuki ◽  
Kiyohiko Tabayashi ◽  
Kosuke Shobatake
Keyword(s):  
Absorption Spectra ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Region ◽  
Vacuum Ultraviolet Region

Polarized Crystal Absorption Spectra of Pd(II) and Pt(II) Tetrahalo and Tetrathiocyanato Complexes

1979 ◽  
Vol 34 (2) ◽  
pp. 211-219
Author(s):  
W. Tuszynski ◽  
G. Gliemann
Keyword(s):  
Single Crystal ◽  
Absorption Spectra ◽  
Theoretical Calculations ◽  
Electron Interaction ◽  
Ultraviolet Region ◽  
Ligand Field ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Near Ultraviolet ◽  
Spectral Assignment

Abstract Single crystal absorption spectra of tetrachloro, tetrabromo, and tetrathiocyanato complexes of Pd(II) and Pt(II) have been measured in the visible and near-ultraviolet region at temperatures between 10 K and 295 K. A spectral assignment of the observed d-d transitions based on ligand field theoretical calculations including electron-electron interaction and spin-orbit coupling is proposed which is consistent for all the systems investigated

Absorption spectra of SrH in the ultraviolet region

1976 ◽  
Vol 9 (13) ◽  
pp. 2313-2320 ◽  
Author(s):  
M A Khan ◽  
M Rafi ◽  
I A Khan ◽  
M A Baig
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Region

Reproduction of the UV-vis spectra of boron subphthalocyanine chloride in different solvents using time-dependent generalized Kohn–Sham density functionals with first solvation shell

2018 ◽  
Vol 22 (08) ◽  
pp. 670-678 ◽  
Author(s):  
Xue Chen ◽  
Wenlan Chen ◽  
Shaohui Zheng
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Solvation Shell ◽  
Photon Absorption ◽  
Ultraviolet Region ◽  
Density Functionals ◽  
Research Fields ◽  
Boron Subphthalocyanine ◽  
Experimental Absorption

Because of the unique physical, chemical and optical characteristics of boron subphthalocyanine chloride, it has been widely applied in different research fields and attracted global researchers. Deep insight into its UV-vis spectrum is required to understand the mechanism of the photon absorption of boron subphthalocyanine chloride in its condensed phase. In the present work, we utilize generalized Kohn–Sham density functionals with a non-equilibrium solvation model to simulate the UV-vis spectra of boron subphthalocyanine chloride in different solvents. Without considering the first solvation shell, we find that the slopes of lines drawn with [Formula: see text]B97XD and CAM-B3LYP results vs. experimental absorption wavelengths are close to 1.0 and root–mean–square deviations are less than 40 nm. We also find that the inclusion of the first solvation shell surrounding boron subphthalocyanine chloride monomers generally makes the calculated results worse. Finally, we discover that the simulated results overestimate oscillator strength of electronic absorption spectra in the ultraviolet region with respect to experimental spectra. These results imply that it may be important to consider the aggregation of solute molecules in order to understand the electronic absorption spectra of subPC in solution

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