- Two-photon pumped lasing stilbene-type chromophores containing various terminal donor groups: Relationship between lasing efficiency and intramolecular charge transfer
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A series of new two-photon pumped (TPP) up-conversion lasing dyes, named as CSPI, DPASPI, PSPI, DEASPI and HEASPI respectively, have been synthesized. These dyes are stilbene-type chromophores end-capped with the same acceptor group but with varied donor
- Wang,Zhou,Yu,Wang,Fang,Jiang,Lei,Wang
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- Two-photon absorption of styryl-quinolinium, -pyridinium, and -barbituric acid derivatives, and intramolecular charge transfer
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A series of new chromophores, styryl-parent end-capped with various donors, and with barbituric acid, methyl-pyridinium, and methyl-quinolinium as the acceptors, has been synthesized and characterized by element analysis or X-ray diffraction. Using the Z-scan system, their two-photon absorption (TPA) cross-section values (δ) have been determined under excitation with 10 Hz, and 1064 nm, 35 ps mode-locked Nd:YAG laser pulse in DMF with do = 0.05 M. The effective δ value is as high as 10.9 × 10-48 cm4 s per photon for trans-4-(4′-N,N-diphenyl amino) styryl-N-methyl quinolinium iodide (DPASQI). The δ value increases from barbituric acid- to pyridinium- to quinolinium-derivatives apparently due to the increase in both the conjugated degree and planarity; however, when the acceptor is fixed, the δ value increases from dialkyl amino groups to diphenyl amino groups even though the latter is a weaker donor than the dialkyl amino groups. Theoretical calculations confirm that the increased distortion from planarity for the barbituric acid derivative makes its δ value decrease. The relatively large δ value for quinolinium- or pyridinium-derivatives originates from larger intramolecular charge transfer, which can be characterized by the difference of dipole moment (Δμge) between the S0 and S1, and the transition dipole moment (Mee′) between S1 and S2.
- Wang,Wang,Yu,Zhou,Zhao,Fang,Jiang
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- Zeolite molecular accessibility and host-guest interactions studied by adsorption of organic probes of tunable size
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A series of fluorescent probe molecules based on the commercially available trans-4-(4-(diethylamino)styryl)-N-methylpyridinium iodide (DAMPI) scaffold has been developed. The dynamic radii of these DAMPI-type probes covered a range of 5.8 to 10.1 ? and c
- Hendriks,Valencia,Bruijnincx,Weckhuysen
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p. 1857 - 1867
(2017/08/17)
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- A novel europium(iii) complex with versatility in excitation ranging from infrared to ultraviolet
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One- and two-photon absorption properties of a novel europium(iii) complex containing a hemicyanine cation are investigated in this paper; in which the sensitization wavelength of europium(iii), induced by beta-diketonate ligands, is in the ultraviolet range, and the hemicyanine(aminostyrylpyridinium) cation extends the sensitization wavelength of Eu(iii) to visible region. Furthermore, under 1.06 μm ultrashort pulse laser excitation, the complex exhibits effective europium(iii) luminescence induced by the two-photon absorption of the hemicyanine cation. Therefore, this new europium(iii) complex with excitation bands in the near infrared, visible and ultraviolet ranges. Since the 1.06-μm ultrafast laser is one of the most frequently used laser sources and 1.06 μm is an 'optical window' for cells and tissues, the results suggest that this kind of complex has promising applications in deep-penetrating and high quality bioimaging in vivo. the Owner Societies 2009.
- Shi, Meng,Ding, Cairong,Dong, Jianwen,Wang, Hezhou,Tian, Yupeng,Hu, Zhangjun
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experimental part
p. 5119 - 5123
(2011/06/16)
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- Pyrene-excimers-based antenna systems
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A series of dendrimeric compounds bearing pyrene units were synthesized to afford light-harvesting antennae based on the formation of intramolecular excimers. The synthetic plan profited from the efficiency of the Huisgen reaction, the 1,3-dipolar cycload
- Cicchi, Stefano,Fabbrizzi, Pierangelo,Ghini, Giacomo,Brandi, Alberto,Foggi, Paolo,Marcelli, Agnese,Righini, Roberto,Botta, Chiara
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supporting information; experimental part
p. 754 - 764
(2009/08/07)
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