38 research outputs found
Photoinduced charge separation and recombination under distance, orientation, and spin controlled conditions.
Great efforts have been made to mimic the efficient photoinduced charge separation and concomitant
energy storage of natural photosynthetic systems via artificial (supra) molecular constructs as well
as to design molecules with potential use for application in molecular electronic circuits. Close packing
of such molecules introduces the problem of short-circuiting and cross talk between the separate molecular
components. In the present paper the limits will be investigated to which such short-circuiting can be
prevented by the use of saturated hydrocarbon (alkane) type insulating structures. Furthermore, as will be
shown, several typically molecular scale operating principles such as orbital symmetry and spin multiplicity
control can allow the realisation of systems in which fast and efficient charge separation is combined
with very slow charge recombination even when the distance between the D(onor) and A(cceptor) moieties
is very small
Long-lived short-distance intramolecular charge separation via intermolecular triplet sensitisation.
Discovery and computational rationalization of diminishing alternation in [n]dendralenes
The [n]dendralenes are a family of acyclic hydrocarbons which, by virtue of their ability to rapidly generate structural complexity, have attracted significant recent synthetic attention. [3]Dendralene through [8]dendralene have been previously prepared but no higher member of the family has been reported to date. Here, we describe the first chemical syntheses of the "higher" dendralenes, [9]dendralene through [12]dendralene. We also report a detailed investigation into the spectroscopic properties and chemical reactivity of the complete family of fundamental hydrocarbons, [3]dendralene to [12]dendralene. These studies reveal the first case of diminishing alternation in behavior in a series of related structures. We also report a comprehensive series of computational studies, which trace this dampening oscillatory effect in both spectroscopic measurements and chemical reactivity to conformational preferences.Mehmet F. Saglam, Thomas Fallon, Michael N. Paddon-Row and Michael S. Sherbur