Supplementary Material (ESI) for Journal of Materials Chemistry This journal is © the Royal Society of Chemistry 2009 S1 Second Harmonic Generation in nonsymmetrical squaraines: tuning of the directional charge transfer character in highly delocalized dyes Luca Beverina, Riccardo Ruffo, Giorgio Patriarca, Filippo De Angelis, Dominique Roberto, Stefania Righetto, Renato Ugo and Giorgio A. Pagani Supporting Information: 1. Synthetic details for the squaraines preparation 2. Technical details for the Cyclic Voltammetry measurements 3. Cyclic voltammetry for derivatives 13 and 15. 4. References for the Supporting Information