Unusual photoluminescence properties of the 3D mixed-lanthanide-organic frameworks induced by dimeric structures: a theoretical and experimental approach. 2014

Carime V Rodrigues, and Leonis L Luz, and José Diogo L Dutra, and Severino A Junior, and Oscar L Malta, and Claudia C Gatto, and Huayna C Streit, and Ricardo O Freire, and Claudia Wickleder, and Marcelo Oliveira Rodrigues
LIMA-Laboratório de Inorgânica e Materiais, Instituto de Química, Campus Universitário Darcy Ribeiro, CEP 70904970, P.O. Box 4478, Brasilia-DF, Brazil. marcelozohio@unb.br.

The present work describes a complementary experimental and theoretical investigation of the spectroscopic properties of the four isostructural 3D Ln-MOFs (wherein PDC = pyrazole-3,5-dicarboxylate, [La2(PDC)3(H2O)4]·2H2O (1), [(La0.9Eu0.1)2(PDC)3(H2O)4]·2H2O (2), [(La0.9Tb0.1)2(PDC)3(H2O)4]·2H2O (3) and [(La0.9Eu0.5Tb0.5)2(PDC)3(H2O)4]·2H2O (4)). The experimental data and theoretical calculations show that the singular photophysical properties presented by these Ln-MOFs are induced by strong interaction between the Ln(3+) ions.

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