A series of isostructural homo- and heterolanthanide coordination polymers of formula [Ln2(dcpa)3(H2O)]∞ with Ln = La–Gd have been obtained by reactions in water between the lightest lanthanide chlorides and the disodium salt of 4,5-dichlorophthalic acid (H2dcpa). They present particularly high thermal stability for coordination compounds (up to 400 °C). Their luminescent properties have been studied in detail. Interestingly an insensitivity to water coordination as well as a very strong effect of optical dilution is observed. Therefore, molecular alloys with very high lanthanum concentration have been prepared. Some of them present highly tunable and very intense luminescence. For example, to the best of our knowledge, [Sm0.04La1.96(dcpa)3(H2O)]∞ presents one of the highest overall quantum yields measured so far for a Sm3+-based coordination compound (Q Sm Ligand = 9.2%), and [Nd0.03Sm0.14Eu0.03La1.8(dcpa)3(H2O)]∞ is one of the brightest (12 Cd·m–2 under 0.75 mW·cm–2 UV flux) multiemissive visible and near-infrared lanthanide-coordination polymers reported to date.

Highly luminescent and color-tunable stable colloidal suspensions of molecular alloys are reported. They are produced via a green synthetic route in ethanol medium. The mean hydrodynamic diameter of the colloids...

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