Thermochromism of Organic Compounds

Samat, A.; Lokshin, Vladimir

doi:10.1007/0-306-46912-x_11

Cited by 34 publications

(42 citation statements)

References 83 publications

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“…[4][5][6] The thermocolorability can be defined at each temperature as the absorbance at the maximum of the PM band in the visible region, A PM , relative to the total concentration, C 0 . By rearranging Equation (5), Equation (9) is obtained, which relates the thermocolorability to the equilibrium constant and molar absorption coefficient of PM.…”

Section: Thermochromic Behaviormentioning

confidence: 99%

“…Both spirooxazines and naphthopyrans can exhibit thermochromism, especially in polar solvents, which stabilize the polar transition state and thus lower the energy barrier to the thermal coloration reaction. [4][5][6] Even though the presence of thermochromism can affect the performance of such systems as photochromes, arising from incomplete decoloration at high temperature and/or high concentration, they can find use in windows that allow sunlight to pass into buildings when the ambient temperature is low and block solar radiation at high ambient temperature. Different specific applications of photochromic systems, such as optical filters, smart windows, temporary or permanent memories, optical switches, coating materials, and temperature indicators, require different thermal and photochemical properties.…”

Section: Introductionmentioning

confidence: 99%

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Photochromic, Thermochromic, and Fluorescent Spirooxazines and Naphthopyrans: A Spectrokinetic and Thermodynamic Study

et al. 2008

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The photochromic and thermochromic behavior of four commercially available Reversacol dyes are presented. The compounds studied belong to the class of spirooxazines and naphthopyrans, which are typically thermoreversible photochromic molecules. On stimulation with UV light, these compounds become colored and exhibit spectra which extend over the whole visible region. Increasing the temperature causes spontaneous coloration (thermochromism). Herein, absorption and fluorescence spectra, molar absorption coefficients of the colorless and colored forms, fluorescence and photochemical quantum yields, and kinetic parameters of thermal bleaching (rate constant, frequency factor, and activation energy) are determined in acetonitrile solution. The thermal ground-state reaction is exhaustively described in terms of thermodynamic parameters (equilibrium constant, free energy, enthalpy, and entropy). Temperature effects on photochemical and thermal colorabilities are evaluated. The results indicate that the two spirooxazines are good photochromes below room temperature, whereas they are efficient thermochromic compounds above room temperature. Naphthopyrans are better photochromes but worse thermochromic compounds than spirooxazines.

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Section: Thermochromic Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photochromic, Thermochromic, and Fluorescent Spirooxazines and Naphthopyrans: A Spectrokinetic and Thermodynamic Study

et al. 2008

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“…(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005) (thermochromism): [12] the so-called multistate molecules.…”

Section: Introductionmentioning

confidence: 99%

Bio‐Inspired Multistate Networks Responsive to Light, pH and Thermal Inputs – An Example of a Multistate System Operating Through Different Algorithms

Giestas¹,

Folgosa²,

Lima³

et al. 2005

Eur J Org Chem

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Two multistate networks based on 4Ј-acetamidoflavylium and 4Ј-aminoflavylium, possessing six-and sevenfold multistates, respectively, and that can be reversibly interchanged by inputs of light, pH jumps and heat, are characterized. The two networks are connected irreversibly, the 4Ј-acetamidoflavylium being transformable into the 4Ј-aminoflavylium by means of a heat input in extremely acidic solutions. The possibility of performing several different write-

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“…The latter is quite uncommon, 2 but it has been already described in our group for 2-aryl-2-methyl-[2H]benzopyrans. 3 Generally, these two processes are concomitant, their relative importance depending on the structures and the temperature.…”

Section: Introductionmentioning

confidence: 92%

Short communication: A thermochromism study in the ferrocenyl‐benzopyran series

Anguille

Brun

Guglielmetti

2004

Applied Organom Chemis

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The synthesis and the photochromic behaviour of a series of benzopyrans (otherwise called 2H-chromenes), substituted in the 2-position by a metallocene, have been previously described. Some of these compounds also present thermochromic properties. As the thermochromism has been scarcely studied in the benzopyran series, we describe here a study of the thermochromic properties of ferrocenyl benzopyrans. The correlations between the structure of the compounds investigated and their thermochromic properties are discussed.

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Thermochromism of Organic Compounds

Cited by 34 publications

References 83 publications

Photochromic, Thermochromic, and Fluorescent Spirooxazines and Naphthopyrans: A Spectrokinetic and Thermodynamic Study

Photochromic, Thermochromic, and Fluorescent Spirooxazines and Naphthopyrans: A Spectrokinetic and Thermodynamic Study

Bio‐Inspired Multistate Networks Responsive to Light, pH and Thermal Inputs – An Example of a Multistate System Operating Through Different Algorithms

Short communication: A thermochromism study in the ferrocenyl‐benzopyran series

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