The design and synthesis of new stimuli-responsive hydrogen-bonding monomers that display a diversity of self-assembly pathways is of central importance in supramolecular chemistry. Here we describe the aggregation properties of a simple, intrinsically C2-symmetric enantiopure bicyclic cavity compound bearing a terminally unsubstituted ureidopyrimidinone fragment fused with a pyrrole moiety in ...

Motivated by recent antitrust cases in markets with zero-pricing, we develop a leverage theory of tying two-sided markets. In the presence nonnegative price constraint, Chicago school critique tie-ins fails to hold. independent products case, provides mechanism circumvent constraint tied market without inviting aggressive responses rival firm. complementary “price squeeze” cannot be used extrac...

Multifunctional molecular materials comprising porphyrins and fullerenes have served as perfect prototypes to study key aspects of natural photosynthesis starting at light harvesting energy transfer processes all the way charge separation, shift, recombination. Herein, hexa-peri-hexabenzocoronenes (HBCs) are explored, decorated with one, two, six their peripheral positions, within context repli...

Shigeo Maruyama and Yasutaka Yamaguchi Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan TEL/FAX: +81-3-5800-6983 e-mail: [email protected] Abstract The formation process of imperfect fullerenes C60 and C70 was simulated using the molecular dynamics method as described in our previous report. These imperfect fullerenes were kep...

The fullerene C70 may be considered as the shortest possible nanotube capped by a hemisphere of C60 at each end. Vibrational spectroscopy is a key tool in characterising fullerenes, and C70 has been studied several times and spectral assignments proposed. Unfortunately, many of the modes are either forbidden or have very low infrared or Raman intensity, even if allowed. Inelastic neutron scatte...

Recent theoretical results for the response of Czo , CGO and C70 fnllerene clusters to external electromagnetic fields are reviewed. The calculated static response of free eGO has large linear and nonlinear components, the latter being much smaller than originally suggested and significantly reduced by screening effects. Random field approximation calculations indicate that the dynamical dipole...

In this work, a rapid and sensitive method, based on ultrasound-assisted extraction of samples with a small volume of toluene, has been developed for the quantification of C60 and C70 fullerenes in soil and sediments. Good extraction efficiencies were obtained at all of the fortification levels studied (200, 100, 20 and 2 ng/g), which ranged from 72 to 104%. An important effect of the extractio...

A synthetic methodology is reported that functionalizes C60 and C70 fullerenes with dihydroazepine rings by a cascade reaction encompassing rhodium-catalyzed cycloisomerization of 1,5-bisallenes [4+2] cycloaddition. This transition metal-catalyzed provides versatile step-economical approach to the synthesis 6,7-membered polyheterocyclic fullerene adducts. Electrochemical characterization produc...