Spectral and photochromic properties of two long-chain spiropyranindoline monolayers at the air–solid interface

1980 ◽  
Vol 58 (19) ◽  
pp. 2038-2043 ◽  
Author(s):  
Marcel Morin ◽  
Roger M. Leblanc ◽  
Ilona Gruda
Keyword(s):  
Absorption Band ◽  
Surface Pressure ◽  
Spectroscopic Properties ◽  
Photochromic Properties ◽  
Solid Interface ◽  
Pressure Area ◽  
Solid Film ◽  
Uv Visible ◽  
Long Chain

Some long-chain spiropyranindolines have been studied at the air–water and the air–solid interfaces. We have measured the surface pressure–area isotherms of these compounds and two of them are characterized by a solid film. We have also investigated the spectroscopic properties (uv–visible) of these spiropyranindolines in monolayer and in solution. The deposition of monolayers on quartz slides allowed the study of the photochromic properties of these compounds at the air–solid interface. The 3′,3′-dimethyl-1′-hexadecyl-6-nitrospiro(2H-1-benzopyran-2,2′-indoline), irradiated at 253.7 nm, showed the appearance of a new absorption band at 570 nm which varied in intensity when the number of monolayers and the time of irradiation were changed.

scholarly journals Synthesis of long-chain coumarines and 2H-chromenes. Spectral and monolayer properties

1979 ◽  
Vol 57 (11) ◽  
pp. 1377-1383 ◽  
Author(s):  
H. P. Pommier ◽  
J. Baril ◽  
I. Gruda ◽  
R. M. Leblanc
Keyword(s):  
Molecular Structure ◽  
Spectroscopic Properties ◽  
Water Interface ◽  
Air Water Interface ◽  
Pressure Area ◽  
Long Chain

Several coumarines and 2H-chromenes containing one or two long-chain substituents were synthesized and their spectroscopic properties (uv, nmr) were investigated. All compounds were studied at the air–water interface. Five of them give a monolayer which is characterized by the pressure–area isotherm. An interpretation of the isotherms is discussed in relation to the molecular structure.

The Molecular Orientation in Monomolecular Layer of Synthesized Porphines-ZnTPP and Copper (II) Phthalocyanine

2014 ◽  
Vol 636 ◽  
pp. 101-104
Author(s):  
Feng Ling Bian ◽  
Yong Jian Chen ◽  
Hai Ning Cui ◽  
Hai Shui Wang ◽  
Shi Quan Xi
Keyword(s):  
Electron Micrographs ◽  
Surface Pressure ◽  
Molecular Orientation ◽  
Transmission Electron Micrographs ◽  
Systematic Research ◽  
Monomolecular Layer ◽  
Transmission Electron ◽  
Visible Spectra ◽  
Pressure Area ◽  
Uv Visible

Systematic research on Monomolecular Layer of Copper (II) Phthalocyanine (CuPc) and porphyrin (Por) derivatives bas been done. In this paper an attention is focused upon the molecular orientation in monomolecular layer of some symmetrically and asymmetrically substituted CuPc and Por by means of the surface pressure-area (π-A) isotherm method, the transmission electron micrographs (TEM) , polarized UV-visible spectra.

The Molecular Orientation in Monomolecular Layer of Phthalocyanine and Porphyrin Derivatives

2014 ◽  
Vol 989-994 ◽  
pp. 680-683
Author(s):  
Chun Peng Zhang ◽  
Hui Miao Guo ◽  
Hai Ning Cui ◽  
Hai Shui Wang ◽  
Shi Quan Xi
Keyword(s):  
Surface Pressure ◽  
Molecular Orientation ◽  
Systematic Research ◽  
Monomolecular Layer ◽  
Porphyrin Derivatives ◽  
Visible Spectra ◽  
Pressure Area ◽  
Uv Visible

Systematic research on monomolecular layer of copper (II) phthalocyanine (CuPc) and porphyrin derivatives bas been done. In this paper an attention is focused upon the molecular orientation in monomolecular layer of some symmetrically substituted porphyrin and asymmetrically substituted CuPc derivatives by means of the surface pressure-area (π-A) isotherm method, polarized UV-visible spectra.

Anisotropic molecules forming a monomolecular layer on a strongly adhesive substrate: a scaled particle treatment

1983 ◽  
Vol 61 (12) ◽  
pp. 1592-1598
Author(s):  
M. Banville ◽  
A. Caillé
Keyword(s):  
Fatty Acids ◽  
Surface Pressure ◽  
Adjustable Parameter ◽  
Scaled Particle Theory ◽  
Long Chain Fatty Acids ◽  
Monomolecular Layer ◽  
Aromatic Molecules ◽  
Simplifying Assumptions ◽  
Long Chain ◽  
Chain Fatty Acids

Long chain fatty acids and large, rigid, aromatic molecules form a monomolecular layer on the surface of clean mercury. The surface pressure isotherms of these systems have been measured previously. In this paper, the scaled particle theory is applied to such monolayers with a number of simplifying assumptions. With a single adjustable parameter, the interaction of the molecules with the substrate and the general features of the surface pressure isotherms of the long chain fatty acids, anthracene, naphthalene, and cholesterol at intermediate liquid densities are fairly well reproduced.

Molecular Organization of Nonlinear Organic Films Laminated by Langmuir-Blodgett Method

2005 ◽  
Vol 492-493 ◽  
pp. 115-122 ◽  
Author(s):  
Saburo Uchida ◽  
Vijay T. Chitnis ◽  
Hideo Furuhashi ◽  
Toshio Yoshikawa ◽  
Akinori Maeda ◽  
...  
Keyword(s):  
Surface Pressure ◽  
Nonlinear Optical ◽  
Epitaxial Films ◽  
Operating Conditions ◽  
Molecular Organization ◽  
Optimum Operating ◽  
Monolayer Formation ◽  
Langmuir Blodgett ◽  
Molecular Arrangement ◽  
Pressure Area

In the 21st century, the optical computation is likely to be the basic technology for processing lots of information at high speed. The aim of the present research work is to develop optical logic gates or memory chips. For this purpose, we have examined the suitability of organic nonlinear optical dye material Vanadyl-phthalocyanine (VOPc). Large single crystals of this material have been fabricated by using Molecular Beam Epitaxy (MBE) technique. The epitaxial films were formed on the substrate under optimum operating conditions. However, the epitixial growth is observed only up to a limited thickness. Above this thickness, the films become non-epitaxial, which can be improved by annealing. The reformation of the epitaxial films has been confirmed. We have also reported the effects of the environment of high temperature on the multilayered tetra-tert-butyl-Vanadyl-phthalocyanine ((t-bu)4VOPc) films, formed by Langmuir-Blodgett (LB) method. The solvent used to dissolve ((t-bu)4VOPc) was 1,2-dichloroethane. The monolayer on the surface of the water was transferred to a glass substrate by the vertical dipping method. If the multilayered stack is too thick, the molecular arrangement of the film may get disturbed. The improvement in the molecular arrangement of the LB films was examined and confirmed by measuring it’s nonlinear optical susceptibility, using Maker Fringe Method. Monolayer formation on water surface depends on the surface pressure-area isotherm. If this monolayer formation is not perfect, multiplayer stacks cannot be formed. The molecular films were aligned almost perpendicular to the substrate, as estimated from the limiting molecular area of surface pressure-area isotherm. The molecular organization of the monolayer on the substrate and the molecular structure of the multilayered ((t-bu)4VOPc) films are discussed.

scholarly journals New photochromic salt spiropyrans of indoline series

2019 ◽  
Vol 484 (6) ◽  
pp. 698-702
Author(s):  
A. D. Pugachev ◽  
M. B. Lukyanova ◽  
V. V. Tkachev ◽  
B. S. Lukyanov ◽  
N. I. Makarova ◽  
...  
Keyword(s):  
Absorption Band ◽  
Diffraction Analysis ◽  
Hypsochromic Shift ◽  
X Ray Diffraction ◽  
Photochromic Properties ◽  
Photoinduced Form ◽  
X Ray ◽  
Long Wavelength

The synthesis and study of the structure and photochromic properties of the new salt spiropyrans of the indoline series containing chlorine and bromine atoms as a substituent at the 6' position in 2H-chromene moiety are presented. The structure of the obtained compounds was confirmed by NMR 1H spectroscopy and X-ray diffraction analysis. The compounds are photochromic; the long-wavelength maximum of the absorption band of their open photoinduced form has a significant hypsochromic shift, and the lifetime substantially increases in comparison with the fluorine analog.

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