Source:http://linkedlifedata.com/resource/pubmed/id/17622140
| Subject | Predicate | Object | Context |
|---|---|---|---|
| pubmed-article:17622140 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:17622140 | lifeskim:mentions | umls-concept:C0032207 | lld:lifeskim |
| pubmed-article:17622140 | lifeskim:mentions | umls-concept:C0596335 | lld:lifeskim |
| pubmed-article:17622140 | pubmed:issue | 16 | lld:pubmed |
| pubmed-article:17622140 | pubmed:dateCreated | 2007-7-30 | lld:pubmed |
| pubmed-article:17622140 | pubmed:abstractText | To explore the photophysics of platinum acetylide chromophores with strong two-photon absorption cross-sections, we have investigated the synthesis and spectroscopic characterization of a series of platinum acetylide complexes that feature highly pi-conjugated ligands substituted with pi-donor or -acceptor moieties. The molecules (numbered 1-4) considered in the present work are analogs of bis(phenylethynyl)bis(tributylphosphine)platinum(II) complexes. Molecule 1 carries two alkynyl-benzothiazolylfluorene ligands, and molecule 2 has two alkynyl-diphenylaminofluorene ligands bound to the central platinum atom. Compounds 3 and 4 possess two dihexylaminophenyl substituents at their ends and differ by the number of platinum atoms in the oligomer "core" (one vs two in 3 and 4, respectively). The ligands have strong effective two-photon absorption cross-sections, while the heavy metal platinum centers give rise to efficient intersystem crossing to long-lived triplet states. Ultrafast transient absorption and emission spectra demonstrate that one-photon excitation of the chromophores produces an S1 state delocalized across the two conjugated ligands, with weak (excitonic) coupling through the platinum centers. Intersystem crossing occurs rapidly (Kisc approximately 1011 s-1) to produce the T1 state, which is possibly localized on a single conjugated fluorenyl ligand. The triplet state is strongly absorbing (epsilonTT > 5 x 104 M-1 cm-1), and it is very long-lived (tau > 100 micro s). Femtosecond pulses were used to characterize the two-photon absorption properties of the complexes, and all of the chromophores are relatively efficient two-photon absorbers in the visible and near-infrared region of the spectrum (600-800 nm). The complexes exhibit maximum two-photon absorption at a shorter wavelength than 2lambda for the one-photon band, consistent with the dominant two-photon transition arising from a two-photon-allowed gerade-gerade transition. Nanosecond transient absorption experiments carried out on several of the complexes with excitation at 803 nm confirm that the long-lived triplet state can be produced efficiently via a sequence involving two-photon excitation to produce S1, followed by intersystem crossing to produce T1. | lld:pubmed |
| pubmed-article:17622140 | pubmed:language | eng | lld:pubmed |
| pubmed-article:17622140 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:17622140 | pubmed:status | PubMed-not-MEDLINE | lld:pubmed |
| pubmed-article:17622140 | pubmed:month | Aug | lld:pubmed |
| pubmed-article:17622140 | pubmed:issn | 0020-1669 | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:KreinDouglas... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:SchanzeKirk... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:DrobizhevMikh... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:RebaneAleksan... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:KimKye-YoungK... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:RogersJoy EJE | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:FleitzPaul... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:HallBenjamin... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:SlagleJonatha... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:McLeanDaniel... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:CooperThomas... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:BurkeAaron... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:FratiniAlbert... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:MakarovNikola... | lld:pubmed |
| pubmed-article:17622140 | pubmed:author | pubmed-author:FarleyRichard... | lld:pubmed |
| pubmed-article:17622140 | pubmed:issnType | lld:pubmed | |
| pubmed-article:17622140 | pubmed:day | 6 | lld:pubmed |
| pubmed-article:17622140 | pubmed:volume | 46 | lld:pubmed |
| pubmed-article:17622140 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:17622140 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:17622140 | pubmed:pagination | 6483-94 | lld:pubmed |
| pubmed-article:17622140 | pubmed:year | 2007 | lld:pubmed |
| pubmed-article:17622140 | pubmed:articleTitle | Platinum acetylide two-photon chromophores. | lld:pubmed |
| pubmed-article:17622140 | pubmed:affiliation | Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, OH 45433, USA. | lld:pubmed |
| pubmed-article:17622140 | pubmed:publicationType | Journal Article | lld:pubmed |