The structural features leading to the intense quenching free luminescence exhibited by europium oxalate nanocrystals, poly[[hexaaquatri-2 -oxalatodieuropium] 4.34-hydrate], {[Eu 2 (C 2 O 4 ) 3 (H 2 O) 6 ]Á4.34H 2 O} n , is the focal point of this report. Europium oxalate nanocrystals were synthesized by a simple microwave-assisted co-precipitation method. Powder X-ray diffraction analysis revealed the monoclinic structure of the nanocrystals and the phase purity. The morphology and particle size were examined by transmission electron microscopy (TEM) analysis. Luminescence measurements on a series of samples of La 2-x Eu x (C 2 O 4 ) 3 Á10H 2 O, with x varying in the range 0.1 to 2, established the quenching free nature exhibited by the europium oxalate nanocrystals. A singlecrystal structure analysis was carried out and the quenching free luminescence is explained on the basis of the crystal structure. A detailed photoluminescence characterization was carried out using excitation and emission studies, decay analysis, and CIE coordinate and colour purity evaluation. The various spectroscopic parameters were evaluated by Judd-Ofelt theoretical analysis and the results are discussed on the basis of the crystal structure analysis. research papers Acta Cryst. (2019). C75, 589-597 Alexander et al. Quenching free luminescence of europium oxalate nanocrystals 597

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Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008