X-ray powder diffraction.Iso-structurality of the prepared molecular alloys, with [Eu 2 (dcpa) 3 (H 2 O)] ∞ 1 (F1) or with [Er 2 (dcpa) 3 (H 2 O) 5 •3H 2 O] ∞ (F2), 2 respectively, was assumed on the basis of their X-ray powder diffraction diagrams (Figures S1 to S5). Diagrams were collected using a Panalytical X'Pert Pro diffractometer equipped with an X'Celerator detector. Recording conditions were: 45 kV, 40 mA for Cu K ( = 1.542 Å) in / mode between 5° and 75°. Calculated patterns were produced using PowderCell and WinPLOTR programs. [3][4][5] Electron Dispersive Spectroscopy.Relative metallic contents of the different microcrystalline powders have been estimated on the basis of ESD measurements. Results of these measurements are listed in Tables S1 to S5. EDS measurements have been performed with a Hitachi TM-1000, Tabletop Microscope version 02.11 (Hitachi High-Technologies, Corporation Tokyo Japan) with EDS analysis system (SwiftED-TM, Oxford Instruments Link INCA). Samples were deposited on carbon discs. Reproducibility of the elemental analyses has been checked by repeating the measurements several times. These experiments confirm the homogeneity of the samples.
Optical measurementsSolid-state emission and excitation spectra have been measured on a Horiba Jobin-Yvon Fluorolog III fluorescence spectrometer equipped with a Xe lamp 450 W, a UV-Vis photomultiplier (Hamamatsu R928, sensitivity 190-860 nm) and an IR-photodiode cooled by liquid nitrogen (InGaAs, sensitivity 800-1600 nm) or on a Horiba Jobin-Yvon FluoroMax 4 Plus fluorescence spectrometer equipped with a Xe lamp 150 W and a UV-Vis photomultiplier (Hamamatsu R928, sensitivity 190-860 nm). Quantum yield measurements were performed using a F-3018 Jobin-Yvon integrating sphere ( E c -E a )/(L a -L c ) with E c