NDLI: Two series of reactant's ratio-dependent lanthanide organic frameworks derived from nicotinic acid N-oxide and oxalate: synthesis, crystal structures and luminescence properties

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zhang, Lijuan Yu, Yanyan Zuhra, Zareen Zhou, Yunshan
Description	Author Affiliation: Yu Y ( State Key Laboratory of Chemical Resource Engineering, Institute of Science, Beijing University of Chemical Technology, Beijing 100029, P. R. China. zhouys@mail.buct.edu.cn.)
Abstract	Two series of lanthanide(III)–organic frameworks with the molecular formula $[Ln_{2}(NNO)_{2}(OX)_{2}(H_{2}O)_{4}]_{n}$ (Ln = Eu 1, Tb 2, Sm 3, Dy 4, Gd 5) and $[Ln_{2}(NNO)_{4}(OX)(H_{2}O)_{2}]_{n}$ (Ln = Eu 6, Tb 7, Sm 8, Dy 9, Gd 10) were synthesized successfully under the same hydrothermal conditions with nicotinic N-oxide (HNNO) and oxalic acid $(H_{2}OX)$ as the mixed ligands merely through varying the molar ratio of the reactants. The compounds were characterized by IR, elemental analysis, UV, TG-DTA and powder X-ray diffraction (XRD). X-ray single-crystal diffraction analyses of compounds 1 and 7 selected as representatives and powder XRD analysis of the compounds revealed that both the series of compounds feature three-dimensional (3-D) open frameworks, and crystallize in the triclinic P space group while with different unit cell parameters. In compound 1, pairs of $Eu^{3+}$ ions and pairs of $NNO^{−}$ ligands connect with each other alternately to form a 1-D infinite Eu-NNO double chain, the adjacent 1-D double-chains are then joined together through $OX^{2−}$ ligands leading to a 2D layer, the 2-D layers are further ‘pillared’ by $OX^{2−}$ ligands resulting in a 3-D framework. In compound 7, the 1-D Tb-NNO infinite chain and its 2-D layer are formed in an almost similar fashion to that in compound 1. The difference between the structures of the two compounds 1 and 7 is that the adjacent 2-D layers in compound 7 are further connected by $NNO^{−}$ ligands resulting in a 3-D framework. The photoluminescence properties and energy transfer mechanism of the compounds were studied systematically. The energy level of the lowest triplet states of the HNNO ligand (23148 $cm^{−1})$ was determined based on the phosphorescence spectrum of compound 5 at 77 K. The $^{5}D_{0}$ $(Eu^{3+})$ and $^{5}D_{4}$ $(Tb^{3+})$ emission lifetimes are 0.46 ms, 0.83 ms, 0.69 ms and 0.89 ms and overall quantum yields are 1.03%, 3.29%, 2.58% and 3.78% for the compounds 1, 2, 6 and 7, respectively.
ISSN	14779226
Issue Number	10
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-03-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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