scholarly journals Linear and nonlinear luminescence properties of thiophene based materials

2005 ◽  
Vol 70 (2) ◽  
pp. 201-208 ◽  
Author(s):  
L.U. Ping ◽  
Ming Xia
Keyword(s):  
Cross Sections ◽  
Single Photon ◽  
Photon Absorption ◽  
Luminescence Properties ◽  
Quantum Yields ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Fs Laser ◽  
Thiophene Derivatives ◽  
Linear And Nonlinear

Three new thiophene based organic luminescence compounds, i.e., 2,5-bis(4?-N,N-dimethylaminostyryl) thiophene (BMST), 2,5-bis(4?-N,N-diethylaminostyryl)thiophene (BEST) and 2,5-bis(4?-N-cyclobutylaminostyryl)thiophene (BBST), were synthesized. All of their measured single-photon excited fluorescence (SPEF) are located in the range of ? 530 nm with quantum yields of around 40 %, and the corresponding lifetime was ? 1 ns. The examined compounds show strong solvatochromism in their SPEF spectra. Excited by a fs laser at 800 nm, a strong up-converted fluorescence of the examined compounds was detected. The profile of two-proton excited fluorescence (TPEF) was similar to that of SPEF. The two-photon absorption (TPA) cross sections of the compounds were determined by the TPEF method. All the compounds showed large TPA cross sections. Hence these thiophene derivatives may have good TPA properties.

Synthesis, characterization, photophysical and DNA photocleavage properties of amphiphilic porphyrins

2014 ◽  
Vol 18 (03) ◽  
pp. 221-230 ◽  
Author(s):  
Jie Zhang ◽  
Mingyu Teng ◽  
Dan Li
Keyword(s):  
Cross Sections ◽  
Photophysical Properties ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Two Photon Absorption ◽  
Pyridinium Cation ◽  
H Nmr ◽  
Two Photon ◽  
Porphyrin Derivatives ◽  
Tof Ms

A series of amphiphilic porphyrins appended with pyridinium cation and/or polyethylene glycol have been synthesized and fully characterized by 1 H NMR, IR and MALDI-TOF-MS. Their photophysical properties were determined and the singlet oxygen (1 O 2) quantum yields of these compounds are in the range of 0.30–0.61 in CHCl 3 and 0.048–0.18 in Tris buffer. The measured two-photon absorption (TPA) cross-sections σ(2) of these porphyrin derivatives are between 110 and 240 GM. These amphiphilic porphyrins show some photocleavage activities (10%–21%) towards the anionic DNA observed at 100 μM.

Synthesis of π-extended B ← N coordinated phenanthroimidazole dimers and their linear and nonlinear optical properties

2020 ◽  
Vol 49 (23) ◽  
pp. 7737-7746
Author(s):  
Mukundam Vanga ◽  
Shreenibasa Sa ◽  
Anupa Kumari ◽  
Anna Chandrasekar Murali ◽  
Prakash Nayak ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Conjugation Length ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Fluorescence Quantum Yields ◽  
Two Photon ◽  
Linear And Nonlinear

B ← N coordinated phenanthroimidazole dimers exhibit excellent fluorescence quantum yields in solution and conjugation length dependant two-photon-absorption properties.

scholarly journals A Series of Imidazole Derivatives: Synthesis, Two-Photon Absorption, and Application for Bioimaging

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yingzhong Zhu ◽  
Lufei Xiao ◽  
Meng Zhao ◽  
Jiazheng Zhou ◽  
Qiong Zhang ◽  
...  
Keyword(s):  
Cross Sections ◽  
Water Solubility ◽  
Single Photon ◽  
Photon Absorption ◽  
Formation Reaction ◽  
Two Photon Absorption ◽  
Imidazole Derivatives ◽  
Two Photon ◽  
Photon Fluorescence ◽  
Imidazole Compound

A new series of D-π-A type imidazole derivatives have been synthesized and characterized. Two corresponding imidazolium salts (iodine and hexafluorophosphate) were prepared from the imidazole compound. Their electron-withdrawing ability can be largely tunable by salt formation reaction or ion exchange. UV-vis absorption and single-photon fluorescence spectra have been systematically investigated in different solvents. The two-photon cross sectionsδ2PAof the imidazole derivatives are measured by two-photon excited fluorescence (2PEF) method. Compared with those ofT-1(107 GM) andT-3(96 GM),T-2(imidazolium iodine salt) has a large two-photon absorption (2PA) cross section value of 276 GM. Furthermore, the cytotoxicity and applications in bioimaging for the imidazole derivatives were carried out. The results showed thatT-1can be used as a lysosomal tracker with high stability and water solubility within pHs of 4–6, whileT-2andT-3can be used as probes for cell cytoplasm.

Fluorenylethynylpyrene derivatives with strong two-photon absorption: influence of substituents on optical properties

2015 ◽  
Vol 3 (15) ◽  
pp. 3730-3744 ◽  
Author(s):  
C. Lavanya Devi ◽  
K. Yesudas ◽  
Nikolay S. Makarov ◽  
V. Jayathirtha Rao ◽  
K. Bhanuprakash ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Sections ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Fluorescence Quantum Yields ◽  
Two Photon ◽  
Influence Of Substituents

A series of fluorenylethynylpyrene derivatives with large two-photon absorption cross-sections (≈250–2500 GM) and good fluorescence quantum yields (Φfl = 0.55–0.98) and with high two-photon brightness were synthesized.

scholarly journals Multi-photon excitation in uncaging the small molecule bioregulator nitric oxide

2013 ◽  
Vol 371 (1995) ◽  
pp. 20120129 ◽  
Author(s):  
John V. Garcia ◽  
Fan Zhang ◽  
Peter C. Ford
Keyword(s):  
Nitric Oxide ◽  
Cross Sections ◽  
Near Infrared ◽  
Single Photon ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nir Light ◽  
Photon Excitation ◽  
Ultraviolet Wavelength

Multi-photon excitation allows one to use tissue transmitting near-infrared (NIR) light to access excited states with energies corresponding to single-photon excitation in the visible or ultraviolet wavelength ranges. Here, we present an overview of the application of both simultaneous and sequential multi-photon excitation in studies directed towards the photochemical delivery (‘uncaging’) of bioactive small molecules such as nitric oxide (NO) to physiological targets. Particular focus will be directed towards the use of dyes with high two-photon absorption cross sections and lanthanide ion-doped upconverting nanoparticles as sensitizers to facilitate the uncaging of NO using NIR excitation.

Theoretical studies on the one- and two-photon absorption of tetrabenzoporphyrins and phthalocyanines

2004 ◽  
Vol 82 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Xin Zhou ◽  
Ai-Min Ren ◽  
Ji-Kang Feng ◽  
Xiao-Juan Liu
Keyword(s):  
Dipole Moment ◽  
Cross Sections ◽  
Density Functional ◽  
Transition Dipole Moment ◽  
Photon Absorption ◽  
Transition Dipole ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Order Of Magnitude ◽  
The One

The one-photon absorption (OPA) properties of tetrabenzoporphyrins (TBPs) and phthalocyanines (Pcs) were studied using the semiempirical ZINDO method and time-dependent density functional theory (TDDFT), respectively. The compared results confirmed that the semiempirical ZINDO method was reasonably reliable when calculating the OPA of tetrabenzoporphyrins and phthalocyanines. On the basis of the OPA properties obtained from the ZINDO method, two-photon absorption (TPA) properties of two series of molecules were investigated, using ZINDO and sum-over-states (SOS) methods. The results showed that the TPA cross-sections of all molecules were in the range of 220.6 × 10–50 – 345.9 × 10–50 cm4·s·photon–1, which were in the same order of magnitude as the values reported in the literature. The relatively larger δ(ω) value for Pcs with respect to that for corresponding TBPs originates from larger intramolecular charge transfer, which can be characterized by the difference of dipole moment between S0 and S1 and the transition dipole moment between S1 and S5.Key words: two-photon absorption, ZINDO, sum-over-states, tetrabenzoporphyrin, phthalocyanines.

Novel 2,1,3-Benzothiadiazole-Based Red-Fluorescent Dyes with Enhanced Two-Photon Absorption Cross-Sections

2006 ◽  
Vol 12 (8) ◽  
pp. 2303-2317 ◽  
Author(s):  
Shin-ichiro Kato ◽  
Taisuke Matsumoto ◽  
Motoyuki Shigeiwa ◽  
Hideki Gorohmaru ◽  
Shuuichi Maeda ◽  
...  
Keyword(s):  
Cross Sections ◽  
Fluorescent Dyes ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Two Photon

A small-molecule with a large two-photon absorption cross-section serves as a membrane-permeable ribonucleic acid (RNA) probe for live cell imaging

2018 ◽  
Vol 42 (17) ◽  
pp. 14325-14331 ◽  
Author(s):  
Ruiqing Feng ◽  
Longlong Li ◽  
Bing Li ◽  
Jinhui Li ◽  
Dan Peng ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Live Cell Imaging ◽  
Plasma Membranes ◽  
Cell Imaging ◽  
Photon Absorption ◽  
Absorption Cross ◽  
High Permeability ◽  
Two Photon Absorption ◽  
Two Photon

DMI could light up the RNA of the nucleus and the cytoplasm in living systems, which not only exhibits larger two-photon absorption cross-sections (981 GM), but also displays high-permeability to plasma membranes of vigorous cells.

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