Benzene rings

Rings of controversy around benzene.

FLOW-CYTOMETRIC MEASUREMENTS of cell DNA content or narrow-angle light scatter (NLS) can provide a basis for discriminating neoplastic from non-neoplastic cells by identifying differences in DNA content and cell size. Flow-cytometric analyses of many human neoplasms have been previously reported (Barlogie et at., 977, 1978) showing aneuploidy in 80-90% of non-lymphoid solid tumours and 4060% of...

Single-molecule conductance through multiple π-π-stacked benzene rings determined with direct electrode-to-benzene ring connections.

Understanding electron transport across π-π-stacked systems will help to answer fundamental questions about biochemical redox processes and benefit the design of new materials and molecular devices. Herein we employed the STM break-junction technique to measure the single-molecule conductance of multiple π-π-stacked aromatic rings. We studied electron transport through up to four stacked benzen...

Rings sliding on a honeycomb network: Adsorption contours, interactions, and assembly of benzene on Cu(111)

Using a van der Waals density functional vdW-DF Phys. Rev. Lett. 92, 246401 2004 , we perform ab initio calculations for the adsorption energy of benzene Bz on Cu 111 as a function of lateral position and height. We find that the vdW-DF inclusion of nonlocal correlations responsible for dispersive interactions changes the relative stability of eight binding-position options and increases the bi...

Aromaticity of distorted benzene rings: exploring the validity of different indicators of aromaticity.

The effect of three in-plane (bond length alternation, bond length elongation, and clamping) and three out-of-plane deformations (boatlike, chairlike, and pyramidalization) on the aromaticity of the benzene molecule has been analyzed employing seven widely used indicators of aromaticity. It is shown that only the aromatic fluctuation index (FLU) is able to indicate the expected loss of aromatic...

Differential Polynomial Rings of Triangular Matrix Rings