Synthesis, Crystal Structure, and Photoluminescent Properties of Two Porous Pillared-layer Metal-organic Frameworks Constructed by Benzene-1,3,5-tricarboxylic Acid and Bisimidazole Ligands

Abstract

Two pillared layer metal organic frameworks, namely {[Co₃(Btc)₂(Bib)₃(H₂O)₂] · 7H₂O}_n(I) and {[Cd₂(Btc)(Bib)₂(Fma)(H₂O)] · H₂O}_n (II), where H₃Btc is benzene-1,3,5-tricarboxylic acid, Fma is formate anion and Bib is 1,4-bis(1-imidazolyl)benzene, have been successfully synthesized by solvothermal method and structurally characterized by element analysis, IR spectroscopy, as well as single crystal X-ray diffractionand power X-ray diffraction (СIF files CCDC nos. 1829267 (I), 1829266 (II)). In the complexes I and II, the full deprotonated aromatic polycarboxylate take the same coordination mode to bridging four metal ions but result in different 2D network, which are further pillared by bib ligands to form 3D architectures with piont symbol of (4².6⁴)₂(4².6⁷.8)₂(6⁴.8²) and (4².6³.8)(4².6⁴)(4².6⁷.8), respectively. The photoluminescent property of complex II is also reported.