Home
Resources
Publications
Excited-state and Photoelectrochemical Behavior of Pyrene-Linked Phenyleneethynylene Oligomer

Excited-state and Photoelectrochemical Behavior of Pyrene-Linked Phenyleneethynylene Oligomer

Yoichiro Matsunaga, Kensuke Takechi, Takeshi Akasaka, A R Ramesh, P V James, K George Thomas, Prashant V Kamat

J Phys Chem B. 2008 Nov 20;112(46):14539-47.

PMID: 18839986

Abstract:

An oligophenyleneethynylene (OPE), 1,4-bis(phenyleneethynyl)-2,5-bis(hexyloxy)benzene (2), is coupled with pyrene to extend the conjugation and allow its use as a light-harvesting molecule [Py-OPE (1)]. The absorption and emission maxima of 1 are red-shifted compared to those of 2. Similar differences in the singlet and triplet excited-state properties are evident. The fluorescence yield of 2 in toluene is 0.53, which is slightly less than the value for the parent OPE (2) of 0.66. The excited singlet and triplet of 1 as characterized from transient absorption spectroscopy exhibit lifetimes of 1.07 ns and 4.0 micros, respectively, in toluene. When 1 was cast as a film on a glass electrode (OTE) and excited with a 387-nm laser pulse, we observed the formation of excitons that decayed within a few picoseconds. When 1 was cast as a film on a SnO2-modified conducting glass electrode (OTE/SnO2), a small fraction of excitons dissociated to produce a long-lived charge-separated state. The role of the SnO2 interface in promoting charge separation was inferred from the photoelectrochemical measurements. Under visible light excitation, the OTE/SnO2 electrode was capable of generating photocurrent (approximately 0.25 mA/cm2) with an incident photon conversion efficiency (IPCE) of approximately 6%.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP349095041	2,5-Bis(hexyloxy)-1,4-bis[2,5-bis(hexyloxy)-4-formyl-phenylenevinylene]benzene		349095-04-1	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: