Detail of "38575-74-5"

Reference

Nonlinear Optical Characteristics of Polymethine Dyes

Nonlinear Optical Characteristics of Polymethine Dyes. Ganeev, R. A.; Tugushev, R. I.; Ishchenko, A. A.; Derevyanko, N. A.; Ryasnyanskii, A. I.; Usmanov, T. (NPO Akadempribor, Academy of Sciences of Uzbekistan, Tashkent 700125, Uzbekistan). Optics and Spectroscopy (Translation of Optika i Spektroskopiya), 95(3), 435-441 (English) 2003 MAIK Nauka/Interperiodica Publishing. CODEN: OPSUA3. ISSN: 0030-400X. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) Section cross-reference(s): 41 Nonlinear refraction, nonlinear absorption, and satd. absorption of a no. of polymethine dyes are studied and their nonlinear optical parameters are measured by the Z-scan method (l = 1064 nm). Simultaneous occurrence of several nonlinear optical processes in the case of excitation of dye solns. by picosecond pulses is analyzed. Satd. 61575-72-2 and 38575-74-5 are just another two chemicals used in this study. absorption of dye solns. is considered in terms of different models. .

Thermochromism and thermofluorochromism of merocyanines with a positive solvatochromism

All Rights Reserved. Thermochromism and thermofluorochromism of merocyanines with a positive solvatochromism. Ishchenko, A. A.; Kulinich, A. V.; Bondarev, S. L.; Knyukshto, V. N.; Turban, A. A. (Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Kiev 02094, Ukraine). Optics and Spectroscopy, 101(1), 90-97 (English) 2006 Pleiades Publishing, Inc. CODEN: OPSUA3. ISSN: 0030-400X. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Section cross-reference(s): 41, 73 The thermochromism and thermofluorochromism of ethanol solns. of di-, tetra-, and hexamethine merocyanines based on 1,3-dihydro-1,3,3-trimethyl-(2H)-indol-2-ylidene and malonodinitrile, having a pos. solvatochromism as compared to the corresponding cationic and anionic sym. dyes, are studied at T = 348, 293, and 4.2 K. Upon a decrease in the temp. 38575-74-5 which is the cas registry number of some chemical is mentioned., the absorption spectra exhibit bathochromic shifts of bands, an increase in the vinylene shifts, and a decrease in deviations, whereas the fluorescence spectra exhibit opposite changes. In this case, the differences in the shapes of the absorption and luminescence bands decrease so considerably that the bands become virtually mirror-sym. The spectral and luminescent effects obsd. arise because, at high temps., the electronic structure of the ground state of merocyanines approaches that of neutral polyenes, whereas, at low temps., this structure is similar to the structure of ideal polymethine. Such a transformation of the structure is caused by an increase in specific electrostatic interactions (nucleophilic and electrophilic solvations) with a solvent, as a result of which the alternation of the charges of a chromophore increases, while its bond orders become equalized. .