Chemistry Faculty Publications

Document Type

Article

Abstract

The series of three donor-spacer-acceptor complexes, DPAF-Ptn-NDI, has been synthesized and characterized using time-resolved absorption spectroscopy In these complexes, the donor is a (diphenylamino)-2,7-fluorenylene (DPAF) unit, the acceptor is a naphthalene diimide (NDI), and the spacers are a series of platinum acetylides of varying lengths, [-Pt(PBu(3))(2)C C-Ph-C C-](n) (where Bu = n-butyl Ph = 1,4-phenylene and n = 1 2, and 3) Electrochemistry indicates that the DPAF-Ptn-NDI system has a charge transfer state at ca 1 5 eV above the ground state that is based on one electron transfer from the DPAF donor to the NDI acceptor Transient absorption spectroscopy on time scales ranging from 0 2 ps to 1 mu s reveals that excitation of all of the complexes leads to production of the charge transfer state with nearly unit quantum efficiency The rates for charge separation and charge recombination are not strongly dependent upon the length of the platinum acetylide spacer, suggesting that the spacer is actively involved in the electron (hole) transport processes Analysis of the experimental results leads to a model in which charge separation and charge recombination occur by hole-hopping via states localized on the [-Pt(PBu(3))(2)C C-Ph-C C-](n) bridge.

Publication Date

11-2010

Publication Title

Journal Of Physical Chemistry B

Volume

114

Issue

45

Start Page No.

14763

End Page No.

14771

DOI

10.1021/jp103531y

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Chemistry Commons

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