•Gold nanoparticles modified nonlinear optical material was synthesized by a very simple method.•The luminescence quantum yields of SAu NPs was enhanced due to the enhancement of ICT process.•TPACS of the nanomaterial enhancement with laser irradiation induced charge transfer from complex to the gold nanoparticles.•This material can target mitochondria via two photon fluorescence imaging.Gold nanostructures have recently received increasing interest in bioimaging application. Herein, a novel nanostructure material was designed by the terminal sulfur of the S ((E)-3-(4-([2,2′:6′,2″-terpyridin]-4′-yl)styryl)-9-hexyl-9H-carbazole Zn(SCN)2 complex) modified with Nano gold. It could be used to target mitochondria under two-photon laser confocal microscopy, due to the energy of laser irradiation gained from the absorbed photons to be dispersed as excess heat to the neighboring particles and thus to induce their fusion, compared with free complex. Furthermore, small size Nano-Au composite was synthesized with longer lifetime, larger two photon absorption cross section (σ) and third order nonlinear optical susceptibility (χ(3)) in the near-infrared region (NIR), due to the laser irradiation induced charge transfer from complex to the gold nanoparticles, which attracting potential applications in vitro and in vivo cellular imaging.A new type of mitochondrial identification of Nano fluorescent dyes.

•A novel chromophore with D–π–A configuration was reported.•The structure was determined by single crystal X-ray diffraction analysis.•The relationships between the structures and properties were investigated.•The cis-trans isomerization of the ethylene group had large influence on its properties.•The two-photon absorption cross-sections were determined by Z-scan technique.One novel 2,2′:6′,2″-terpyridine ligand L and its complexes (Zn(S)2L, Cd(S)2L) were synthesized and systematically characterized. There were cis-trans isomerization of the ethylene group in compounds of L, Zn(S)2L and Cd(S)2L though some characterization. Finally it was found that the two-photon absorption cross section values (σ) for the complexes in the near infrared region (∼800 nm) were dramatically enhanced compared to the free D–π–A type ligand.One novel 2,2′:6′,2″-terpyridine ligand L and its complexes Zn(S)2L, Cd(S)2L were synthesized, they display interesting cis-trans isomerization and excellent NLO properties.

The third-order nonlinear materials have been the focus of present research. It is known that the χ(3) value of the organic optical material is generally small, and hardly displays any evident third order nonlinear effect. However, the χ(3) value was significantly improved when the organic ligands were combined with nano-Ag due to the increase of surface plasmon resonance. The nano-Ag changes its local electric field, and in turn causes a regional interaction between the ligand and the metal clusters. In this article, a new optical carbazole derivative (E)-2-(4-([2,2′:6′,2′′-terpyridine]-4′-yl)styryl)-9-hexyl-9H-carbazole, abbreviated as L, has been designed and synthesized. The ligands were combined with nano-Ag, acting on the surface and stabilizing the system without any extra control such as surfactant and pH, which may be explained by the theory of hard and soft acid–base. Careful characterizations have been performed by UV-vis absorption spectroscopy, 1H NMR spectroscopy, FT-IR, XRD and TEM. Particular properties have been shown by fluorescence spectra, fluorescence lifetime, Raman spectrum, non-linear optical response and cyclic voltammetry curve. The results indicate that the nano-composite L–Ag NCs have a stronger Raman enhancement effect, shorter fluorescence lifetime and larger two-photon absorption (TPA) when compared to the free ligand L. The data for the TPA cross-section value (σ = 1336.85 GM), nonlinear refractive index (γ = 2.23 × 10−13 cm2 W−1) and third order nonlinear optical susceptibility (Re(χ(3)) = 1.16 × 10−11 esu) are measured and discussed.

•A novel chromophore with A′−D−A configuration was reported.•The structure was determined by single crystal X-ray diffraction analysis.•The relationships between the structures and properties were investigated.•The two-photon absorption cross-sections were determined by Z-scan technique.•The results indicate that auxiliary moiety (A′) largely influence on its properties.A novel chromophore (Z)-ethyl-3-(4-((4-([2,2′:6′,2″-terpyridin]-4′-yl)phenyl) (phenyl) amino)phenyl)-2-cyanoacrylate(3), constructed with triphenylamine moiety as the electron donor (D), 2, 2: 6, 2-terpyridine moiety as an electron acceptor (A), and ethyl cyanocaetate group as an auxiliary electron acceptor (A′), has been designed and synthesized. The crystal structures of 3 and its mediator 2 (4″-(4′-(4-(Diphenylamino) phenyl) aldehyde)-2,2′:6′,2″-Terpyridine), have been determined by single crystal X-ray diffraction analysis. The linear and nonlinear spectra of these chromophores were investigated on the basis of experimental and calculation methods. The two-photon absorption (TPA) cross-sections of 1–3 were determined by a femtosecond open-aperture Z-scan technique. The maximum value of the TPA cross-section (σ) for 3 is 7938.3 GM in DMF solution. However, much weaker two-photon absorption responses were observed at the same condition for chromophore 1 and 2, respectively. The results of the work indicate that, the photophysical properties of the D–A configuration group are influenced largely by the auxiliary moiety (A′) attached.

Two carbazole-based polymerization initiators possessing blue fluorescence emission have been synthesized via Wittig reaction in the solid phase at room temperature. Two-photon excited fluorescence (TPEF) spectra for them were investigated under 800 nm fs laser pulse and two-photon absorption cross sections were determined by the Z-scan technique. Then two-photon initiating polymerization (TPIP) microfabrication experiments were successfully carried out. Three-dimensional lattice and artificial defects were gained, indicating that they were viable candidates for the two-photon polymerization initiator in practical application of microfabrication.