Influence of Pyrazine/Piperazine Based Guest Molecules in the Crystal Structures of Uranyl Thiophene Dicarboxylate Coordination Polymers: Structural Diversities and Photocatalytic Activities for the Degradation of Organic Dye

Abstract

The reaction of uranyl acetate dihydrate with 2,5thiophenedicarboxylic acid (H 2 TDC) as the main ligand and pyrazine (PYZ); piperazine (PZ); 1,4 pyridyl piperazine (PYPZ); 1,4-di(pyridin-4yl) piperazine (DPYZ); 1,2 pyrimidyl piperazine (PMPZ) as auxiliary ligand leads to the formation of five new compounds [UO 2 (TDC)-They were analyzed by IR, UV−vis, thermogravimetric analysis, X-ray diffraction analysis, powder X-ray diffraction, and fluorescence spectroscopy. Depending on the countercation, uranyl thiophene dicarboxylate is shown to crystallize as 2D layer in (I, IV), 2D layer with twofold interpenetrated (6,3) nets in (II), 1D chains in (III), and 2D layer without 2-fold interpenetrated (6,3) nets in (V). The coligand DPYZ in structures of (III and IV) had not been added to the reaction but has been formed by the N-arylation of the PYPZ ligand. Compound (IV) was obtained serendipitously while trying some mixed metal compound. Furthermore, their functional properties, photoluminescence, and photocatalytical activity for oxidation of organic dyes have also been studied. Interestingly, compounds (II and V) with uranyl organic frameworks (UOF's) and honeycomb (6,3) nets possess highest efficiency in degradation of dyes.

2,5-Thiophenedicarboxylate: An Interpenetration-Inducing Ligand in Uranyl Chemistry

“…Drawings were made with ORTEP-3 36 and VESTA, 37 and topological analyses with ToposPro. 38 9,11 Most relevant to the present work is the simple fact that 1 contains intact DMF, even after a reaction period of 24 h (Table 1). This is significant because two other complexes isolated (see ahead) have compositions reflecting the occurrence of DMF hydrolysis.…”

A new two-dimensional CoII coordination polymer based on bis[4-(2-methyl-1H-imidazol-1-yl)phenyl] ether and biphenyl-4,4′-diyldicarboxylic acid: synthesis, crystal structure and photocatalytic degradation activity

“…while the HOMO strongly demands one electron to return to its stable state (Yue et al, 2017). Therefore, electrons are captured from water molecules to produce OH active species (hydroxyl radicals), which can destroy the organic dye efficiently to complete the photocatalysis process (Jennifer et al, 2017;Wu et al, 2017). In order to confirm the proposed mechanism, radical trapping experiments were carried out to detect the main oxidative species in these reactions.…”

Beyond structural motifs: the frontier of actinide-containing metal–organic frameworks

“…, methyl orange (MO), methyl blue (MB), or rhodamine B (RhB)) which was also explored on several An-MOFs. 282–286 For example, a three-dimensional MOF, [Na(H 2 O) 4 ][(UO 2 ) 2 Na(FDA) 3 (H 2 O) 2 ] (H 2 FDA = 2,5-furandicarboxylic acid), was capable of decomposing 21.5% of MO after 1.5 hours of UV-irradiation. 284 Similarly, a heterometallic framework, Ni 2 (H 2 O) 2 (QA) 2 (BPy) 2 U 5 O 14 (H 2 O) 2 (OAc) 2 (H 2 QA = quinolinic acid; HOAc = acetic acid), constructed from polyoxouranium ribbons and nickel-based layers bridged by QA 2− ligands was employed for photocatalytic degradation of MB.…”