The-recently-captured-fullerene-6094C68-was-found-to-exhibit-a-more-aromatic-character-than-originally-assumed-via-density-functional-theory-calculations-h
Such an inconsistency was attributed to the unexpected triplet ground state of pristine (#6094)C68. Seebio Photoacid Generator of C68 isomeric system reveal that (#6094)C68 is thermodynamically favorable at elevated temperatures with respect to the fullerene formation. The regioselective chlorination process of the open-shell C68 was discussed as well to elucidate the formation of octachlorinated derivative C68Cl8 experimentally.Aromaticity with a twist: Möbius [4n]annulenes.Aromatic Möbius [4n]annulenes with 4n pi electrons, originally conceived by Heilbronner, are characterized computationally. These (CH)(12), (CH)(16), and (CH)(20) minima have nearly equal C-C bond lengths, small twist angles around the rings, and magnetic properties (NICS, nucleus-independent chemical shifts--see above at various positions in [16]annulene--and magnetic susceptibility exaltations) indicating significantly diatropic ring currents.
The Möbius forms are not the most stable isomers but may contribute significantly to the chemistry of these annulenes. [structure: see text]Dissected Nucleus-Independent Chemical Shift Analysis of π-Aromaticity and Georgia, Athens, Georgia 30602, and Computational Chemistry Center and Institute of Organic Chemistry, University of Erlangen-Nuremberg, Henkestrasse 42, D-91054 Analysis of the basic π-aromatic (benzene) and antiaromatic (cyclobutadiene) systems by dissected nucleus-independent chemical shifts (NICS) shows the contrasting diatropic and paratropic effects, but also reveals subtleties and Photochemical immobilization of proteins and peptides on benzophenone-terminated Borne, 50 Avenue de Halley, BP 70478, 59658 Villeneuve d'Ascq, France.The successful covalent linking of green fluorescence protein and streptavidin to patterned benzophenone-modified boron-doped diamond (BDD) electrodes is demonstrated. Photoreactive benzophenone moieties were covalently grafted to oxidized diamond surfaces via an esterification reaction. Patterned BDD surfaces were obtained using a UV/ozone lithographic approach either on hydrogen-terminated BDD or on poly(ethylene)-glycol-modified BDD surfaces. UV light (lambda = 365 nm) irradiation of the patterned BDD surfaces in the presence of green fluorescence protein (GFP) or streptavidin resulted in the covalent immobilization of the proteins. The presence of poly(ethylene) glycol chains reduces significantly the nonspecific adsorption of the proteins.
The success of the photoimmobilization of streptavidin was evidenced through biomolecular interaction with avidin. The preservation of the biological activity was furthermore underlined by photoimmobilization of peptides directly onto benzophenone modified BDD using a photomask.Intramolecular cycloaddition in 6,6-spiroepoxycyclohexa-2,4-dienone: simple A formal total synthesis of platencin from a simple aromatic precursor is described. Characterization and Spectroscopic Analysis of 6-butyl-n-hydroxynaphthimide trifluoromethanesulfonic acid of the aromatic compound into reactive spiroepoxycyclohexa-2,4-dienone and intramolecular cycloaddition are the key features of our methodology. 2-Hydroxymethyl-6-(3-hydroxy-hex-5-enyl)-phenol was generated the spiroepoxycyclohexa-2,4-dienone that underwent intramolecular Diels-Alder reaction to give a tricyclic adduct having a core structure of platencin and appropriately disposed functional groups in a single step. Reduction of the double bond present in the ethano-bridge, manipulation of the oxirane ring and introduction of a double bond in the six-membered ring furnished a tricyclic intermediate which has already been converted into Nucleobase Recognition by Artificial Receptors Possessing a Ferrocene Skeleton as a Novel Modular Unit for Hydrogen Bonding and Stacking Interactions.Materials Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
Novel ferrocene-modified artificial nucleobase receptors were designed and synthesized. The nucleobase receptors possess hydrogen-bonding and pi-stacking interaction sites that act simultaneously for binding to 1-butylthymine utilizing the pivot character of the ferrocene skeleton. Diamidopyridine was chosen for the hydrogen-bonding moiety, and various polynuclear aromatics were used for pi-stacking one. The two components were tethered to the cyclopentadienyl rings via ethynediyl and oxymethylene spacers. The binding affinity of the receptors to 1-butylthymine was found to be dependent on the aromatic structures. Thus, the association constants for perylene-linked receptors were approximately doubled compared to those of aromatic-free ones, an energy difference of approximately 0 kcal/mol. Detailed comparisons between the 10 receptors clarified the value of the pivot character of the ferrocene for construction of the intermolecular interaction site.
Diverse aromatic-degrading bacteria present in a highly enriched autotrophic Science and Technology (AIST), Tsukuba, Ibaraki, Japan.Biotransformation of refractory organics by ammonia-oxidizing microorganisms in nitrifying sludge have been widely reported, while the contribution of heterotrophic bacteria in nitrifying sludge in the biotransformation and degradation process might be overlooked.
