S1 Upconverted photosensitization of Tb visible emission by NIR Yb excitation in discrete supramolecular heteropolynuclear complexes Nabila Souri, Pingping Tian, Carlos Platas-Iglesias, Ka-Leung Wong, Aline Nonat and Loïc J. Charbonnière Supplementary material Materials and Methods. Column chromatography and flash column chromatography were performed with silica (0.00630.200 mm, MachereyNagel) or silica gel (4063) µm, MachereyNagel). Solvents were used as purchased. 1 H, 13 C and 31 P NMR spectra were recorded at room temperature on Bruker Avance 300 and Avance 400 spectrometers operating resp. at 300 and 400 MHz for 1 H. Chemical shifts are reported in ppm and were referenced internally to the residual protiated solvents. 1 The abbreviations used to described the multiplicity of the NMR signals are: s (singlet), d (doublet), dd (doublet of doublet), t (triplet), q (quadruplet) and m (multiplet). IR spectra were recorded on a Perkin Elmer Spectrum One Spectrophotometer as solid samples and only the most significant absorption bands are given in cm 1 . Elemental analysis were performed by the service commun d'analyse of the University of Strasbourg. For deuterated compounds, the H content provided were obtained as %H + 0.5%D.