Abstract
The atomic structure of crystals of the [Eu(NО3 )3 (HMPA)3 ] [hexamethylphosphotriamide (HMPA)] complex characterized by an intensive luminescence and triboluminescence was determined using X-ray structural analysis. Noncentrosymmetric crystals have a monoclinic syngony: a=16.0686 (3), b=11.0853 (2), c=20.9655Å (4), β=93.232° (1), space group P21 , Z=4, ρcalc =1.560g/cm3. The crystal structure is represented by individual С18 Н54 EuN12 O12 P3 complexes linked through van der Waals interactions with clearly expressed cleavage planes. The Eu(III) atom coordination polyhedron reflected the state of a distorted square antiprism. Structural aspects of the suggested model, including formation of triboluminescence properties, were considered and the role of the cleavage planes was discussed.
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