Electronic Conduction in Photoactive Metallo‐wires

Harriman, Anthony; Ziessel, Raymond

doi:10.1002/3527607994.ch2

Cited by 14 publications

(6 citation statements)

References 209 publications

(288 reference statements)

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“…1,2 As a rule, such systems contain a molecular platform consisting of luminescent modules (transition metal complexes, organic dyes or luminescent polymers) connected via unsaturated bridges. The concept is to absorb light at several equivalent sites and transport all photons to a single, different emitting or reacting site.…”

Section: Introductionmentioning

confidence: 99%

Facile pathways to multichromophoric arrays based on a truxene platform

Diring

Ziessel

2009

Tetrahedron Letters

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Section: Introductionmentioning

confidence: 99%

Facile pathways to multichromophoric arrays based on a truxene platform

Diring

Ziessel

2009

Tetrahedron Letters

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“…At first glance, these features appear to be mutually opposing! The collection of sunlight by artificial arrays is well documented, − and there are numerous descriptions of rationally designed molecular systems displaying efficacious intramolecular electronic energy transfer (EET). Additional attention has been given to the construction of plastic solar concentrators and to the formulation of light-harvesting sensitizers for use with specific types of solar cells.…”

Section: Introductionmentioning

confidence: 99%

An Artificial Light-Harvesting Array Constructed from Multiple Bodipy Dyes

et al. 2013

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An artificial light-harvesting array, comprising 21 discrete chromophores arranged in a rational manner, has been synthesized and characterized fully. The design strategy follows a convergent approach that leads to a molecular-scale funnel, having an effective chromophore concentration of 0.6 M condensed into ca. 55 nm(3), able to direct the excitation energy to a focal point. A cascade of electronic energy-transfer steps occurs from the rim to the focal point, with the rate slowing down as the exciton moves toward its ultimate target. Situated midway along each branch of the V-shaped array, two chromophoric relays differ only slightly in terms of their excitation energies, and this situation facilitates reverse energy transfer. Thus, the excitation energy becomes spread around the array, a situation reminiscent of a giant holding pattern for the photon that can sample many different chromophores before being trapped by the terminal acceptor. At high photon flux under conditions of relatively slow off-load to a device, such as a solar cell, electronic energy transfer encounters one or more barriers that hinder forward progress of the exciton and thereby delays arrival of the second photon. Preliminary studies have addressed the ability of the array to function as a sensitizer for amorphous silicon solar cells.

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“…6,7 Thus, TEET in synthetically designed systems has been an active area of interest for experimentalists. [8][9][10][11][12] Within the approximations inherent to Fermi's golden rule (FGR), the nonadiabatic TEET rate can be written as…”

Section: Introductionmentioning

confidence: 99%

“…Designing OLEDs requires, in particular, a clear understanding of TEET as spin statistics imply 75% of the created excitons will be phosphorescent rather than luminescent. In OPVs, some donor/acceptor materials have significant triplet exciton populations, and engineering greater fractions of triplet excitons might be a route to improving the short exciton diffusion lengths in these devices. , Thus, TEET in a variety of different systems has been an active area of interest for experimentalists. − …”

Section: Introductionmentioning

confidence: 99%

Triplet Excitation Energy Transfer with Constrained Density Functional Theory

Yeganeh

Voorhis

2010

J. Phys. Chem. C

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We study the electronic coupling matrix element for triplet excitation energy transfer processes with a number of different computational methods. For the first time, constrained density functional theory (CDFT) is applied to the problem of energy transfer, and results are compared with direct coupling calculations of broken symmetry and fragment densities, as well as the splitting method. A naïve calculation of the electronic coupling using diabatic and adiabatic energy differences is shown to yield erroneous results due to the fractional spin error present in both Hartree-Fock and commonly used DFT exchange-correlation functionals. Some potential issues concerning the splitting method with triplet references within Hartree-Fock and DFT are discussed. We find that only methods that compute the matrix element directly (either from CDFT, broken symmetry, or fragment states) appear to be robust. Several illustrative examples are presented.

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Electronic Conduction in Photoactive Metallo‐wires

Cited by 14 publications

References 209 publications

Facile pathways to multichromophoric arrays based on a truxene platform

Facile pathways to multichromophoric arrays based on a truxene platform

An Artificial Light-Harvesting Array Constructed from Multiple Bodipy Dyes

Triplet Excitation Energy Transfer with Constrained Density Functional Theory

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