302326-98-3Relevant academic research and scientific papers
Structure-property relationships in a series of photochromic thiophene-substituted 3H-naphtho [2,1-6]pyrans
Rebiere,Moustrou,Meyer,Samat,Guglielmetti,Micheau,Aubard
, p. 523 - 530 (2007/10/03)
The photochromic parameters of a set of 26 thiophene-substituted [3H]-naphtho[2,1-b]pyrans were studied by flash photolysis. The experimental results obtained along with molecular modelling approaches (molecular mechanics and quantum calculations) allowed us to propose structure-property relationships. From this approach, the main structural modifications able to induce large variations in electronic absorption, fading rates and coloration ability are discussed. Copyright
Direct determination of transient molar absorption coefficient by double pulse excitation
Wintgens,Valat
, p. 2703 - 2708 (2007/10/03)
A new method has been devised to determine the molar absorption coefficient of short-lived photochemical species formed by laser irradiation. The technique consists of a first pump excitation pulse that significantly modifies the concentration of the initial species in its ground state, enough that the variation of the absorbance at maximum absorption of the formed species depends on the initial species concentration. A new absorbance variation is created by a second excitation pulse occurring with a time delay after the first pulse that is small compared to the lifetime of the formed species. The molar absorption coefficient is calculated using the ratio of these two variations in absorbance, assuming that the initial species does not absorb in the spectral range where the absorption variation of the formed species is observed.
Synthesis of Thiophene-Substituted 3H-Naphtho[2,1-b]pyrans, Precursors of Photomodulated Materials
Moustrou, Corinne,Rebière, Nicole,Samat, André,Guglielmetti, Robert,Yassar, Abd Errahim,Dubest, Roger,Aubard, Jean
, p. 1293 - 1302 (2007/10/03)
The synthesis of 3H-naphtho[2,1-b]pyrans 9-21 linked to a thiophene moiety is described. Two different synthetic approaches were applied to prepare these novel functionalized compounds, and their spectrokinetic properties in solution are reported.
