Conformation dependence of molecular conductance: chemistry versus geometry

Geometry dependence of the conductance fluctuations in metallic nanostructures

We investigate fluctuations in the magnetoconductance of noble-metal nanostructures in a mesoscopic two-lead configuration. The samples are gold and silver wires with lengths 500 and 1000 nm and widths w between 45 and 340 nm. The correlation field Bc varies as w -~. Furthermore, the angle 0 between the direction of the magnetic field and the current is changed continuously from 90°(usual geome...

Molecular Order Versus Conformation Changes in Liquid-Crystal Phases

Conformation dependence of DNA exciton parentage.

Singlet electronic excitations of DNA duplex trimers and tetramers with regular homogeneous base-pair sequences ((dA)n.(dT)n and (dG)n.(dC)n, with n=3, 4) have been investigated in vacuo using semiempirical quantum chemistry in a Zerner's Intermediate Neglect of Differential Overlap (ZINDO) approximation. Frequencies, oscillator strengths, and single-electron assignments of many-electron transi...

Effect of nanoscale geometry on molecular conformation: vibrational sum-frequency generation of alkanethiols on gold nanoparticles.

Vibrational sum frequency generation (VSFG) spectroscopy was used to study the nanoscale geometric effects on molecular conformation of dodecanethiol ligand on gold nanoparticles of varying size between 1.8 and 23 nm. By analyzing the CH3 and CH2 stretch transitions of dodecanethiol using the spectroscopic propensity rules for the SFG process, we observe the increase of the gauche defects in th...

Dependence of conductance on percolation backbone mass

We study , the average conductance of the backbone, defined by two points separated by Euclidean distance r, of mass M(B) on two-dimensional percolation clusters at the percolation threshold. We find that with increasing M(B) and for fixed r, asymptotically decreases to a constant, in contrast with the behavior of homogeneous systems and nonrandom fractals (such a...