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Structural Diversity of Three Pyrazoyl-Carboxyl Bifunctional Ligand-Based Metal-Organic Frameworks: Luminescence and
Gao-Peng Li1, Hong-Yun Yang1, Yong-Zhi Li1
1Key Laboratory of Synthetic, and Natural Functional Molecule Chemistry, of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an, 710069, P.R. China.
Abstract:
Three metal-organic frameworks (MOFs), [Cd(Hpzbpdc)(H2 O)]⋅H2 O (1), [Mn2 (Hpzbpdc)2 (dmf)2 ] (2), and [H2 N(CH3 )2 ]0.5 [Eu(Hpzbpdc)1.5 (HCOO)0.5 (dmf)0.5 ]⋅DMF⋅0.5 H2 O (3) (H3 pzbpdc=4'-(2 H-pyrazol-3-yl)biphenyl-3,5-dicarboxylic acid), have been solvothermally synthesized from one pyrazoyl-carboxyl bifunctional ligand and characterized by single-crystal structures. The H3 pzbpdc ligand in 1-3 displays various coordination modes through the pyrazoyl and carboxyl groups. Both 1 and 3 contain dinuclear cluster building units and reveal a four-connected gismondine (gis) zeolite 3D framework and a 2D grid layer structure, respectively. Compound 1 shows blue luminescence, compound 3 reveals red luminescence that arises from efficient energy transfer from the organic ligand to the europium(III) ion, and compound 2 reveals an uncommon (3,8)-connected tfz-d; UO3 net with a rare Mn4 (COO)6 cluster and shows antiferromagnetic interactions between the manganese(II) ions.
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