Geranium lake pigments: The role of the synthesis on the structure and composition

Eosin Y has an extraordinary capacity to form complexes with metallic elements, that have applications in many different fields, from photovoltaics and photocatalysis historical artists’ pigments. To unravel the reactivity, it is essential a precise knowledge of their structure composition, as well how these can be affected by synthesis protocol, often underestimated factor. This manuscript presents thorough investigation composition eosin based on Al Pb, FTIR , XRPD Raman spectroscopy, particular focus effect conditions. Results clearly show change coordination mode Pb depending while remains stable. In both cases, formation by-products was observed. Additionally, detailed band assignment spectra described, providing interesting details such interaction between ion xanthene moiety (chromophore). extremely important for analysis paintings where bonded ions, other materials dye-sensitized solar cells, wastewater treatment or photocatalysis. • The conditions influence geranium lakes. lakes identified specific markers. Traditional methods lead by-products. Geranium may also present impurities.