Crystal Structure, Luminescence and Triboluminescence of the Complex [Eu(NO)3hmpa] NO·HQuin.

The atomic structure of crystals of the complex [Eu(NO)3hmpa] NO·HQuin , (hmpa - hexamethylphosphortriamide, HQuin - quinaldic acid) characterized by intensive luminescence and triboluminescence has been determined by the X-ray method. The noncentro-symmetric crystals of the compound are rhombic : a = 16.8193(3), b = 12.2877(2), c = 27.6516(5) Å, пр. гр. Pca2(1), Z = 4, ρ  = 1.427 g/сm. The crystals have a structure of the insular type which is presented by the isolated complex molecules, outer-sphere NO - groups, and neutral molecules of quinaldic acid. Some structural aspects of formation of the luminescent and triboluminescent properties of the compound were discussed: the role of break planes in the crystal destruction was revealed.