The polyfluorinated title compounds, [MBr(CHFNO)] or [4,4'-(HCFCFCHOCH)-2,2'-bpy]MBr, (1) (M = Pd and bpy is bipyridine) and (2) (M = Pt), have -CHOCHCFCFH side chains with methylene H-atom donors at the α and β sites, and methine H-atom donors at the terminal sites, in addition to aromatic H-atom donors. In contrast to the original expectation of isomorphous structures, (1) crystallizes in the space group C2/c and (2) in P2/n, with similar unit-cell volumes and Z = 4. The asymmetric unit of (1) is one half of the molecule, which resides on a crystallographic twofold axis. Both (1) and (2) display stacking of the molecules, indicating a planar (bpy)MBr skeleton in each case. The structure of (1) exhibits columns with C-H...Br hydrogen bonds between consecutive layers which conforms to a static (β,β) linkage between layers. In the molecular plane, (1) shows double C-H...Br hydrogen bonds self-repeating along the b axis, the planar molecules being connected into infinite belts. Compound (2) has no crystallographic symmetry and forms π-dimer pairs as supermolecules, which then stack parallel to the a axis. The π-dimer-pair supermolecules exhibit (Pt-)Br...Br(-Pt) contacts [3.6937 (7) Å] to neighbouring π-dimer pairs crosslinking the columns. The structure of (2) reveals many C-H...F(-C) interactions between F atoms and aromatic C-H groups, in addition to those between F atoms and methylene C-H groups.
The paper made a research on synergetic effect of gaseous toluene decomposition using dielectric barrier discharge plasma and adsorption. A systematic investigation on toluene removal efficiency and ozone byproduct generation was done using different types of fillers. The mixed fillers were found to be promising as ideal fillers. In terms of toluene removal efficiency, mixed fillers of zeolite and ceramic rings was the highest, around 97%, next is zeolite, then followed by ceramic rings and no filler-packed. Among the tested fillers, mixed fillers showed the least amount of ozone generation. For practical use of mixed fillers, it’s preferable to operate at 18kV than 20 kV, avoiding forming more undesirable O3byproduct on achieving the same toluene removal effect.
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