Specification of Molecular Chirality

The topological analysis of chiral molecular models has provided the framework of a general system for the specification of their chirality. The application, made in and before 1956, of this system to organic-chemical configurations is generally retained, but is redefined with respect to certain types of structure, largely in the light of experience gained since 1956 in the Beilstein Institute and elsewhere. The system is now extended to deal, on the one hand, with organic-chemical conformations, and, on the other, with inorganic-chemical configurations to ligancy six. Matters arising in connexion with the transference of chiral specifications from model to name are considered, notably that of the symbiosis in nomenclature of expressions of the general system and of systems of confined scope. For corrigendum see DOI: 10.1002/anie.196605111     

Hole mobility anisotropy and crystal structure of β-9,10 dichloroanthracene

Hole drift mobilities have been measured in β-9,10 dichloroanthracene by the transient photoconductivity method. Mobilities were found to be isotropic in the ac plane, 0.6 cm²/V sec, and 0.18 cm²/V sec normal to this plane, b¹, at room temperature. At lower temperatures the mobilities were thermally activated, with an activation energy of ～0.25eV. The crystal structure of β-9,10 dichloroanthracene has been determined; it is triclinic. $\text{a = 8.582}\text{A}\text{?}$, $\text{b = 16.825}\text{A}\text{?}$, $\text{c = 3.869}\text{A}\text{?}$, $\text{α = 97.90}\text{,}\text{?}\text{β = 97.90°, γ = 75.99°}$. The influence of the crystal structures of the α- and β- forms on the intermolecular electronic overlap and hence carrier mobilities are discussed.     

一类亚解析函数的复合边值问题

本文研究了一类亚解析函数的复合边值问题.利用经典的消去法和对称扩张,得到了边值问题的可解条件和解的表达式.推广了解析函数的相应理论.     

Kinetics of the oxidation of quercetin by 2,2-diphenyl-1-picrylhydrazyl (dpph•)

In methanol/water, dpph(?) bleaching (519 nm) by quercetin, QH(2), exhibits biphasic kinetics. The dpph(?) reacts completely with the quercetin anion within 100 ms. Subsequent slower bleaching involves solvent and QH(2) addition to quinoid products. The fast reaction is first-order in dpph(?) but only ca. 0.38 order in [QH(2)]. This extraordinary nonintegral order is attributed to reversible formation of π-stacked {QH(-)/dpph(?)} complexes in which electron transfer to products, {QH(?)/dpph(-)}, is slow (k(ET) ≈ 10(5) s(-1)).     

Detection of interaction-induced nonlocal effects using perfectly transmitting nanostructures

We consider one-dimensional transport through an interacting region in series with a point-like one-body scatterer. When the conductance of the interacting region is perfect, independently of the interaction strength, a nonlocal interaction effect yields a total conductance of the composed system that depends on the interaction strength and is lower than the transmission of the one-body scatterer. This qualitative nonlocal effect allows to probe the dressing cloud of an interacting system in ideal noninteracting leads. The conductance correction increases with the strength of the interaction and the reflection of the one-body scatterer (attaining relative changes >50%), and decreases with the distance between the interacting region and the one-body scatterer. Scaling laws are obtained and possible experimental realizations are suggested.     

The embedding method beyond the single-channel case

We investigate the relationship between persistent currents in multi-channel rings containing an embedded scatterer and the conductance through the same scatterer attached to leads. The case of two uncoupled channels corresponds to a Hubbard chain, for which the one-dimensional embedding method is readily generalized. Various tests are carried out to validate this new procedure, and the conductance of short one-dimensional Hubbard chains attached to perfect leads is computed for different system sizes and interaction strengths. In the case of two coupled channels the conductance can be obtained from a statistical analysis of the persistent current or by reducing the multi-channel scattering problem to several single-channel setups.