The effects of N-alkyl and heterocycloalkyl substituents on the light absorption properties of a range of novel dyes based on the 1-naphthyl analogue of Crystal Violet, Victoria Blue, have been investigated. Interaction between the N-terminal group and the peri-hydrogen atom on the naphthyl residue can result in deconjugation of the former, whereupon the dyes exhibit Malachite Green character. Such steric influences are correlated with 1H NMR data.

The effects of cyclic terminal groups in di- and tri-arylmethane dyes. Part 2.1 Steric and electronic effects in derivatives of Victoria Blue

Synthesis and spectroscopic properties of some merocyanine dyes

A novel and efficient procedure was developed for the preparation of diaminotriarylmethanes through the Baeyer condensation of aromatic aldehydes and N,N-dimethylaniline or N,N-diethylaniline in the presence of niobium chloride under solvent-free conditions. This approach offers several advantages, such as short reaction time, high yields, low cost, and mild reaction conditions.

An efficient and convenient protocol for the synthesis of diaminotriarylmethanes

https://dr.ntu.edu.sg/bitstream/10356/80594/1/Organic%20additives%20stabilize%20RNA%20aptamer%20binding%20of%20malachite%20green.pdf

Organic additives stabilize RNA aptamer binding of malachite green

Halogen-Free Room-Temperature Brønsted Acidic Ionic Liquid [Hmim]+ HSO4 − as a Recyclable Green “Dual Reagent” Catalysis for the Synthesis of Triarylmethanes (TRAMs)

A comprehensive series of mono- and di-substituted derivatives of Brilliant Green has been prepared and the various electronic absorption spectra have been determined. Substituents in the 3- or 4-position have little effect on the intensity of the first band, but the wavelength of maximum absorption is shifted to an extent which is linearly related to the appropriate Hammett substituent constant. Substitution in the 2-position leads to a pronounced increase in the intensity of the long-wavelength band.

Steric and Electronic Effects in Basic Dyes VI — Electronic Absorption Spectra of Derivatives of Brilliant Green Containing Substituents in the Phenyl Ring

The hydrolysis of Brilliant Green has been studied over the pH range 6–11. In neutral aqueous solution and in the absence of light, the system reaches equilibrium. In alkaline solution, complete conversion into the dye base occurs. Rate constants and activation parameters have been obtained for the hydrolysis and a reaction scheme is proposed.

Brenda M. Fox

Papers

Steric and Electronic Effects in Basic Dyes VI — Electronic Absorption Spectra of Derivatives of Brilliant Green Containing Substituents in the Phenyl Ring

The hydrolysis of brilliant green and some derivatives. I. A kinetic and equilibrium study of the hydrolysis of brilliant green

The hydrolysis of Brilliant Green and some derivatives. Part 2. The kinetics of the hydrolysis of 3- and 4-substituted derivatives of Brilliant Green