КООРДИНАЦИОННАЯ ХИМИЯ, 2017, том 43, № 2, с. 112–120 УДК 541.49 TWO Pr(III)-BASED METAL-ORGANIC FRAMEWORKS CONSTRUCTED BY DICARBOXYLIC ACID LIGANDS WITH DIFFERENT BACKBONES: CRYSTAL STRUCTURES AND PROPERTIES © 2017 J. J. Wang1, *, Y. Z. Yu2 , E. N. Wang1 H. N. Huang1, Q. Q. Zhao1 , F. Jin1 , and Y. F. Shi1, **e-mail: shiyunfeng2009@gmail.com Received April 14, 2016 Two new Pr(III)-based metal-organic frameworks based on terephthalic acid (H2L1) or anthracene-9,10-dicarboxylic acid (H2L2), namely [Pr4(L1)6(H2O)6]n (I) and [Pr2(L2)3(DMF)4]n (II) (DMF = N,N-dimethylformamide), were prepared by solvothermal reactions and structurally characterized by IR, elemental analysis and X-ray diffraction analysis (CIF files CCDC nos. 1472452 (I) and 971381 (II)). <...> X-ray single crystal diffraction indicates that H2L1 adopts bis-bridging and bridging-chelating/bridging modes in complex I, whereas H2L2 adopts bis-chelating, bis-bridging and bis-chelating/bridging modes in II. <...> Moreover, solid-state UV-Vis absorption and luminescent properties of I, II were also investigated. <...> Keywords: Pr(III)-based MOFs, terephthalic acid, anthracene-9,10-dicarboxylic acid, crystal structures, luminescent properties DOI: 10.7868/S0132344X17020128 INTRODUCTION In the past decades, the rational design and synthesis of metal-organic frameworks (MOFs) have attracted considerable attention for their interesting architectures and tailor-made applications in optics, magnetism, gas storage, ion exchange, and catalysis, etc. [1–5]. <...> The formation of these MOFs mainly depends on the combination of two factors, namely, the nature of ligands and the coordination geometry of metal ions [6–10]. <...> Now the utilization of pillars as secondary building units has proven to be a versatile strategy in the construction of coordination frameworks, especially highly porous structures. <...> As typical pillars, bridging dicarboxylic acid ligands, terephthalic acid (H2L1) andanthracene-9,10-dicarboxylic acid (H2L2) can be partially or fully deprotonated to afford various coordination modes in mono-, di-, or multi-coordinated ways [16–22]. <...> Introduction of these aromatic backbones will enrich the properties and application aspects of target MOFs. <...> Differing <...>