The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform

John M Plater - One of the best experts on this subject based on the ideXlab platform.

Andrea Raab - One of the best experts on this subject based on the ideXlab platform.

Sergio Seixas J De Melo - One of the best experts on this subject based on the ideXlab platform.

  • reconstructing the historical synthesis of Mauveine from perkin and caro procedure and details
    Scientific Reports, 2017
    Co-Authors: Tânia F G G Cova, Alberto A C C Pais, Sergio Seixas J De Melo
    Abstract:

    Mauveine, an iconic dye, first synthesised in 1856 still has secrets to unveil. If nowadays one wanted to prepare the original Perkin’s Mauveine, what would be the procedure? It will be described in this work and lies on the use of a 1:2:1 (mole) ratio of aniline, p-toluidine and o-toluidine. This was found from a comparison of a series of products synthesized from different proportions of these starting materials, with a set of historical samples of Mauveine and further analysed with two unsupervised chemometrics methods.

  • perkin s and caro s Mauveine in queen victoria s lilac postage stamps a chemical analysis
    Chemistry: A European Journal, 2014
    Co-Authors: Maria Da Conceicao Oliveira, Ana Paula Soares Dias, Peter Douglas, Sergio Seixas J De Melo
    Abstract:

    Mauveine, a chemical icon, is no longer commercially available. If nowadays one wanted to have a sample of the original Perkin, or Caro, Mauveine, and see its colour, where would one find it? The answer is on UK Victorian 6d postage stamps from 1867–1880. This was found from a comparison with historical samples of Mauveine, from both William Perkin and a Heinrich Caro sample (here analysed for the first time). These have distinctly different compositions and this was used to identify the origin of Mauveine in the postage stamps, with evidence found for Mauveine made by both Perkin’s and Caro’s synthesis.

  • revisiting perkin s dye s the spectroscopy and photophysics of two new Mauveine compounds b2 and c
    Chemical Communications, 2007
    Co-Authors: Sergio Seixas J De Melo, S Takato, Micaela M Sousa, Maria Joao Melo, A J Parola
    Abstract:

    Two new components have been identified in an early sample prepared according to the original recipe of Perkin, and perhaps even by Perkin himself around 1860 – a new isomer of Perkin's Mauveine B (designated as Mauveine B2) together with a new Mauveine compound (Mauveine C) – and these compounds were synthesized again using starting materials chosen to reproduce Perkin's original synthesis and isolated by HPLC-DAD, identified by 1H NMR, MS and their spectroscopic (UV/Vis and emission) and photophysical behaviour investigated.

William T A Harrison - One of the best experts on this subject based on the ideXlab platform.

Tânia F G G Cova - One of the best experts on this subject based on the ideXlab platform.

  • reconstructing the historical synthesis of Mauveine from perkin and caro procedure and details
    Scientific Reports, 2017
    Co-Authors: Tânia F G G Cova, Alberto A C C Pais, Sergio Seixas J De Melo
    Abstract:

    Mauveine, an iconic dye, first synthesised in 1856 still has secrets to unveil. If nowadays one wanted to prepare the original Perkin’s Mauveine, what would be the procedure? It will be described in this work and lies on the use of a 1:2:1 (mole) ratio of aniline, p-toluidine and o-toluidine. This was found from a comparison of a series of products synthesized from different proportions of these starting materials, with a set of historical samples of Mauveine and further analysed with two unsupervised chemometrics methods.