Fluorescence has been observed directly across the band gap of semiconducting carbon nanotubes. We obtained individual nanotubes, each encased in a cylindrical micelle, by ultrasonically agitating an aqueous dispersion of raw single-walled carbon nanotubes in sodium dodecyl sulfate and then centrifuging to remove tube bundles, ropes, and residual catalyst. Aggregation of nanotubes into bundles ...

A new luminescent coordination polymer, EuH(L)(2)(NO(3))(2) (EuL, HL = 2-(2-pyridin-2-yl)quinoline-4-carboxylic acid), has been solvothermally synthesized, and its framework of uncoordinated pyridyl rings was exploited for the binding and specific sensing of HCl via a protonation effect. The protonation effect changes the energy of the excited state of the ligands, rendering them unable to act ...

JAN A. HERMAN and ALEX. G. HARRISON. Can. J . Chem. 59,2133 (1981). A series of formate (methyl through butyl) and acetate (methyl through pentyl) esters have been protonated in the gas phase by the Brgnsted acids H3+, N2H+, C02H+, N20H+, and HCO+. Carbonyl oxygen protonation is 87-97 kcal mol-' exothermic for H,+ and 47-57 kcal mol-' exothermic for the weakest acid HCO+, permitting a study of ...

Two thioacetyl-terminated ferrocene-anthraquinone donor-acceptor molecules with different pi-electron conjugative units have been synthesized via a series of Stille and Sonagashira reactions. Their photochemical and electrochemical properties before and after addition of an organic acid are investigated, indicating that these complexes are sensitive to external perturbation of protonation, lead...

The data described here supports the research article "Unraveling HIV Protease Flaps Dynamics by Constant pH Molecular Dynamics Simulations" (Soares et al., 2016) [1]. The data involves both standard Molecular Dynamics (MD) and Constant pH Molecular Dynamics (CpHMD) to elucidate the effect of protonation states of catalytic dyad on the HIV-PR conformation. The data obtained from MD simulation d...

We identify protonation sites and study the competition of statistical fragmentation with localized bond cleavage after site-selective nitrogen 1s core-excitation by mass spectrometric detection gas-phase oligonucleotide cations.

A chiral Brønsted acid has been developed from a cationic gold(I) disphosphine complex in the presence of alcoholic solvent and applied to the enantioselective protonation reaction of silyl enol ethers of ketones. Various optically active cyclic ketones were obtained in excellent yields and high enantioselectivities, including cyclic ketones bearing aliphatic substrates at the α-position. Furth...

The synthesis and spectroscopic investigation of aza-crown ethers with anthraquinoneand 1-aminoanthraquinone-functionalized side chains are described. Cation-induced shifts in the UV/VIS absorption spectra of the ligands dissolved in propylene carbonate are observed only for Li+ among the alkali metal ions and for Mg2+ among the alkaline earth metal ions as well as for Ag+ and T1+. Only hypsoch...

Protonation and carbamate formation are critical reactions for CO2 capture using amine-based absorbents which impact both absorption amine regeneration. In this regard, thermodynamic analysis towards in N-methylaminoethanol solution is carried out with specific attention to the corresponding protonation reactions. The mechanism investigated acquisition of reaction equilibrium constant heat reac...

X-ray crystallography has shown that the free acids of adenosine 5'- and 3'-monophosphates and of cytidine 5'- and 3'-monophosphates exist as zwiterions in the solid state with protonation of the adenine base at the N(1) site and of the cytosine base at the corresponding site N(3) and the phosphate group negatively charged. In this paper, evidence is presented for the zwitterionic character of ...