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  • 1. Ng, Chun Hin
    et al.
    Ohlin, C. Andre
    Winther-Jensen, Bjorn
    Characterisation of a series of triarylmethane dyes as light harvesters for photo-electrochemical systems2015In: Dyes and pigments, ISSN 0143-7208, E-ISSN 1873-3743, Vol. 115, p. 96-101Article in journal (Refereed)
    Abstract [en]

    A series of commercially available dyes were characterised by electrochemical, spectroscopic and computational methods. Several dyes, including Fuchsin Basic and Malachite Green were found to have properties that make them potential candidates for use in photo-electrochemical systems. The risks of combining different characterisation methods are also highlighted, namely the combination of thermodynamic reactions (electrochemical redox reactions), electronic transitions (optical spectroscopy) and the use of computational techniques to describe them.

  • 2.
    Revoju, Srikanth
    et al.
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Biswas, Subhayan
    Eliasson, Bertil
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Sharma, Ganesh D.
    Effect of acceptor strength on optical, electrochemical and photovoltaic properties of phenothiazine-based small molecule for bulk heterojunction organic solar cells2018In: Dyes and pigments, ISSN 0143-7208, E-ISSN 1873-3743, Vol. 149, p. 830-842Article in journal (Refereed)
    Abstract [en]

    Two new acceptor–π(donor)–donor–π(donor)-acceptor small molecules SM1 and SM2 with benzodithiophene (BDT) donor core unit linked via phenothiazine (PTZ) donor units with 1,3–indanedione and malononitrile end capping units, respectively, have been designed and synthesized and used as electron donor along with PC71BM as acceptor for solution-processed bulk heterojunction organic solar cells. The influence of these end-capping groups on their thermal, optical, electrochemical properties and photovoltaic performance was investigated. After the optimization of the donor to acceptor weight ratio and solvent vapor annealing, the organic solar cells based on SM1:PC71BM and SM2:PC71BM active layers showed the power conversion efficiency (PCE) of 6.20% and 7.45%, respectively. Hence, the end-capping acceptor units for the two small molecules revealed a significant influence on the PCE of the organic solar cells, which resulted from differences in film absorption, molecular packing and charge transport properties.

  • 3.
    Surowiec, Izabella
    et al.
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Nowik, Witold
    Moritz, Thomas
    Mass spectrometric identification of new minor indigoids in shellfish purple dye from Hexaplex trunculus2012In: Dyes and pigments, ISSN 0143-7208, E-ISSN 1873-3743, Vol. 94, no 2, p. 363-369Article in journal (Refereed)
    Abstract [en]

    Analysis of natural dyes in historical objects is important for both conservation purposes and to determine the origin and culture that produced it. Identification of a particular dye is usually made based on the presence of its main components, while consideration of minor components is important for differentiating between dyes originating from closely related species. Tyrian purple is one of the oldest dyes known to man and derives from different species of marine molluscs. In all of these species, indigotin, indirubin and their brominated analogues are the main colouring compounds. Here, we describe the identification of minor indigoids found in extracts of the pigment obtained from one of the Tyrian purple species, Hexaplex trunculus. Identification of these compounds was made based on isotopic patterns and accurate mass measurements of protonated molecular ions and their high collision energy fragments obtained in LC-MS/MS experiments. The unknown compounds appeared to be analogues of indirubin and its mono- and dibrominated derivatives with one CO group in the indirubin backbone substituted by a CNH group. Identification of these compounds facilitates the detection of dyestuffs from H. trunculus in historical objects and increases our knowledge about the dye biosynthesis and technology of Tyrian purple production. (C) 2012 Elsevier Ltd. All rights reserved.

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