One-photon photophysics and two-photon absorption of 4-[9,9-di(2-ethylhexyl)-7-diphenylaminofluoren-2-yl]-2,2':6',2''-terpyridine and their platinum chloride complexes.
The synthesis, one-photon photophysics and two-photon absorption (2PA) of three dipolar D-π-A 4-[9,9-di(2-ethylhexyl)-7-diphenylaminofluoren-2-yl]-2,2':6',2''-terpyridine and their platinum chloride complexes with different linkers between the donor and acceptor are reported. All ligands exhibit (1)π,π* transition in the UV and (1)π,π*/(1)ICT (intramolecular charge transfer) transition in the visible regions, while the complexes display a lower-energy (1)π,π*/(1)CT (charge transfer) transition in the visible region in addition to the high-energy (1)π,π* transitions. All ligands and the complexes are emissive at room temperature and 77 K, with the emitting excited state assigned as the mixed (1)π,π* and (1)CT states at RT. Transient absorption from the ligands and the complexes were observed. 2PA was investigated for all ligands and complexes. The two-photon absorption cross-sections (σ(2)) of the complexes (600-2000 GM) measured by Z-scan experiment are much larger than those of their corresponding ligands measured by the two-photon induced fluorescence method. The ligand and the complex with the ethynylene linker show much stronger 2PA than those with the vinylene linker.
Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108-6050, USA.
Zhiqiang
Z
Ji
Yunjing
Y
Li
Timothy M
TM
Pritchett
Nikolay S
NS
Makarov
Joy E
JE
Haley
Zhongjing
Z
Li
Mikhail
M
Drobizhev
Aleksander
A
Rebane
Wenfang
W
Sun
D005449:Fluorenes / Q000138:chemical synthesis / Q000737:chemistry*; D049449:Luminescence; D008958:Models, Molecular; D015394:Molecular Structure; D009944:Organoplatinum Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D055668:Photochemical Processes; D017785:Photons; D017671:Platinum Compounds / Q000737:chemistry*; D011725:Pyridines / Q000138:chemical synthesis / Q000737:chemistry*
C556843:4-(9,9-di(2-ethylhexyl)-7-diphenylaminofluoren-2-yl)-2,2':6',2''-terpyridine; D005449:Fluorenes; D009944:Organoplatinum Compounds; D017671:Platinum Compounds; D011725:Pyridines; C030173:platinum chloride