Fullerene polymers: synthesis and properties.

Multiple-walled carbon nanotubes (MWNTs) were chemically modified by a ligand-exchange reaction of ferrocene (Cp-Fe-Cp). The modified MWNTs (Cp-Fe-MWNTs) were next monolithiated by tert-butyllithium and terminated by p-chloromethylstyrene (pMS). The pMS-terminated species (pMS-Cp-Fe-MWNTs) were then functionalized with living polystyryllithium anions via anionic polymerization. The resulting polystyrene-functionalized MWNTs exhibited as polymeric nanocomposites and were soluble in common organic solvents showing distinct colors from a neat polystyrene solution. Syntheses results and the characterization data of the functionalized MWNTs, collected from GC-MS, NMR, electron microscopy, and optical spectroscopy, are presented and discussed.

Preparing a Styrenic Polymer Composite Containing Well-Dispersed Carbon Nanotubes: Anionic Polymerization of a Nanotube-Bound p-Methylstyrene

The derivatives 6-Deoxy-6-[1-(2-amino)ethylamino]-β-Cyclodextrin (CDEn), 6-Deoxy-6-[1-(3-amino)propylamino]-β-Cyclodextrin (CDPn) and 6-Deoxy-6-[1-(4-amino)butylamino]-β-Cyclodextrin (CDBn) were assessed with a view to demonstrating that increasing the chain length of the diaminoalkane moiety can affect the chiral selectivity of the metallo-complexes of these materials. It was shown that IR and Raman spectroscopies can be used to characterise these compounds. The results obtained from the electronic absorption spectra suggested the formation of CuCDAm binary complexes and that the derivatives CDEn and CDPn act as bidentate ligands while CDBn acts as a monodentate ligand due to its longer alkane chain. This study also showed that in the ternary complexes with DOPA there is further coordination of the metal ion to the amino nitrogen atom and the hydroxyl oxygen atom of the drug. On the basis of the results of the circular dichroic spectroscopic studies it was suggested that CuCDEn is the better enantioselective material for DOPA and it acts in a multi-site recognition manner, utilising the inclusion properties of the CD cavity in cooperation with the coordination properties of the metal ion.

https://arrow.tudublin.ie/cgi/viewcontent.cgi?article=1007&context=materart

Spectroscopic Characterisation of Metallo-Cyclodextrins for Potential Chiral Separation of Amino Acids and L/D-DOPA

Synthesis and characterization of poly(p-chloromethylstyrene) nanocomposite comprising covalently bonded carbon nanocapsules: Superiority of thermal properties to a physical blend

A series of inclusion complexes between cyclodextrins (α-, β-, HP-β-, and γ-cyclodextrin, HP-β-cyclodextrin = 2-hydroxypropyl-β-cyclodextrin) and [Zn(dmit)2]2− anion (dmit = 1,3-dithiole-2-thione-4,5-dithiolate) were investigated by electronic spectra, induced circular dichroism (ICD) spectra, 1H-NMR spectra, and quantum chemistry calculations. The stoichiometry of inclusion complexes [Zn(dmit)2]2−@cyclodextrins in solution was determined by the method of continuous variation. The experimental data showed that inclusion complex [Zn(dmit)2]2−@β-cyclodextrin adopted 1:2 and 1:1 guest-to-host inclusion ratios in solution, and the inclusion constants (Kinclu) were computed to be 5.85 × 107 M−2 and 1.63 × 104 M−1, respectively. In the case of [Zn(dmit)2]2−@γ-cyclodextrin, the continuous variation method showed the inclusion complex adopted 1:1 guest-to-host ratio and Kinclu was determined to be 3.27 × 104 M−1. Moreover, inclusion complex [Zn(dmit)2]2−@HP-β-cyclodextrin showed different inclusion modes in solution as well. Time-dependent density functional theory (TD-DFT) was used to assist assignment of the ICD signals in inclusion complexes [Zn(dmit)2]2−@cyclodextrins. The p → π* transition of [Zn(dmit)2]2− chromophore, which occurred in the cavity of cyclodextrin, was calculated to be perpendicular to C=C double bonds and thus parallel to the symmetric axis of the host. When subject to the well-known Harata and Kodaka’s rule, the TD-DFT calculations coincided very well with the spectroscopic data in elucidation of the p → π* transition relevant ICD signals of [Zn(dmit)2]2−@cyclodextrins.

The inclusion complexes between [Zn(dmit)2]2− anion and cyclodextrins: studied by induced circular dichroism spectra and density functional theory calculations

The concentration of sulfate and nitrate in aerosol above Kanto area was measured by aircraft on 6 th and 7 th August 1980 as a survey of photochemical smog. The concentration variation of both ions coincided with that of ozone throughout the field observation. This phenomenon is explained that the formation mechanism of sulfate and nitrate is closely concerned with that of ozone formation. The transport of ozone, sulfate and nitrate is governed mainly by Sagami Bay sea breeze and Kashima Nada sea breeze.

MuranoKentaro

Papers

Sulfate and nitrate concentration in aerosol above kanto area