Synthesis of novel isophorone-based dyes for dye-sensitized solar cells

Abstract

Four organic dyes containing isophorone as the π-bridge unit were synthesised and their photophysical and electrochemical properties were characterised.

Prediction of Absorption Spectrum Shifts in Dyes Adsorbed on Titania

“…( A ) The “misc” category includes various dyes based on pyrazoline, naphthoquinone, N,N-dialkylaniline 105 , julolidine 106 , bithiazole 107 , cyclohexadiene 108 etc. ( B ) The “misc” category includes dyes with anchoring groups that include thiazolidine 73 , aldehyde, hydantoin 109 , isophorone 71 , phosphonic acid and pyrimidine 110 . Numbers on the right are the counts of cases found in each category.…”

“…The particularly large red shifts in the catechol group are attributable to their ability to strongly adsorb on to the TiO 2 surface 70 as well as the increased dipole moment of the surface-bound metal-ligand complex 26,27 . For some of the other groups such as isophorone 71 , malononitrile 72 , thiazolidine 73 and benzoic acid 74 , a majority of the cases are blue-shifted. The impact of multiple anchoring groups 75 was also studied (see Fig.…”

Aldol condensation of refluxing acetone on CaC2 achieves efficient coproduction of diacetone alcohol, mesityl oxide and isophorone

“…5 Similarly, IP is a good solvent for inks, lacquers, gums and coating materials, 6 as well as a reactant for polyurethanes, pharmaceuticals, fragrances and other commercial chemicals. [7][8][9] Currently, NaOH or KOH is used as a catalyst for the liquid phase condensation of acetone, 10 which is confronted with great challenges such as corrosiveness, hard recycling and low catalytic activity. In order to overcome these problems, a better catalyst needs to be developed.…”

Single-Molecule Observations Provide Mechanistic Insights into Bimolecular Knoevenagel Amino Catalysis

“…The Knoevenagel condensation reaction, employing a basic catalyst, is a classical organic synthesis method that is used in applications including dyes for solar cells and organic light-emitting diodes, pharmaceuticals, as well as for the modification of food and personal care products. − Here, we study Knoevenagel amino catalysis involving the reaction between an aromatic aldehyde and an active methylene compound forming a fluorescent dye product in the presence of a surface bound amino catalyst. Using SM fluorescence methods based on super-resolution TIRF microscopy combined with the stochastic analysis of fluorescence time series employing Hidden Markov modeling, we found the kinetics of Knoevenagel amino catalysis to be a multistep process where reactants and intermediates have a complex interplay with the catalyst.…”