Synthesis, Photophysical Characterization, and Surface Photovoltage Spectra of Windmill‐Shaped Phthalocyanine–Porphyrin Heterodimers and Heteropentamers

Zhao, Zhixin; Poon, Chun Ting; Wong, Wai‐Kwok; Tam, Hoi Lam; Cheah, Kok Wai; Wang, Dejun

doi:10.1002/ejic.200700724

Cited by 17 publications

(4 citation statements)

References 43 publications

(44 reference statements)

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“…Moreover, due to their remarkable and quite flexible photo-physical properties, they have been extensively developed for various bio-applications, the most successful of which is perhaps photodynamic cancer therapy [ 3 , 4 , 5 ]. However, related systems are also being developed for engineering applications for inorganic/organic hybrid materials [ 6 ] such as optical power limiting [ 7 , 8 ], photovoltaics [ 9 ] and chemical sensors [ 10 , 11 ]. Porphyrin photochemistry provides insight into the dynamics of related biomolecules, such as the photosynthetic reaction centers in purple bacteria and green plants and heme-based metalloproteins such as hemoglobin and myoglobin.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence and FTIR Spectra Analysis of Trans-A2B2-Substituted Di- and Tetra-Phenyl Porphyrins

et al. 2010

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A series of asymmetrically substituted free-base di- and tetra-phenylporphyrins and the associated Zn-phenylporphyrins were synthesized and studied by X-ray diffraction, NMR, infrared, electronic absorption spectra, as well as fluorescence emission spectroscopy, along with theoretical simulations of the electronic and vibration structures. The synthesis selectively afforded trans-A2B2 porphyrins, without scrambling observed, where the AA and BB were taken as donor- and acceptor-substituted phenyl groups. The combined results point to similar properties to symmetrically substituted porphyrins reported in the literature. The differences in FTIR and fluorescence were analyzed by means of detailed density functional theory (DFT) calculations. The X-ray diffraction analysis for single crystals of zinc-containing porphyrins revealed small deviations from planarity for the porphyrin core in perfect agreement with the DFT optimized structures. All calculated vibrational modes (2162 modes for all six compounds studied) were found and fully characterized and assigned to the observed FTIR spectra. The most intense IR bands are discussed in connection with the generic similarity and differences of calculated normal modes. Absorption spectra of all compounds in the UV and visible regions show the typical ethio type feature of meso-tetraarylporphyrins with a very intense Soret band and weak Q bands of decreasing intensity. In diphenyl derivatives, the presence of only two phenyl rings causes a pronounced hypsochromic shift of all bands in the absorption spectra. Time-dependent DFT calculations revealed some peculiarities in the electronic excited states structure and connected them with vibronic bands in the absorption and fluorescence spectra from associated vibrational sublevels.

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Section: Introductionmentioning

confidence: 99%

Fluorescence and FTIR Spectra Analysis of Trans-A2B2-Substituted Di- and Tetra-Phenyl Porphyrins

et al. 2010

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“…These results implied that the formation efficiency of photogenerated electron-hole pairs was much lower than that of photon absorption when PtTNTs were motivated by the lower wavelength light, resulting from the different electronic transitions among SPS, FISPS, and UV-Vis absorption spectra [42]. From the perspective of photovoltage response for the Pt-TNTs which was lower than that of pristine TNTs, it seemed fair to suggest that the deposited PtO and PtO 2 nanoparticles (not Pt metal) acted as electron traps on the surface of Pt-TNTs.…”

Section: Sps and Fisps Of Pt-tntsmentioning

confidence: 94%

Synthesis and Characterization of the Optical Properties of Pt-TiO₂Nanotubes

Jiang

Jingling

Liao

et al. 2017

Journal of Nanomaterials

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Composite Pt-doped TiO 2 nanotubes (Pt-TNTs) were synthesized via alkaline fusion-hydrothermal method (AFHM) under ambient atmosphere pressure. Further systematic characterization of Pt-TNTs was performed by using XPS, surface photovoltage spectroscopy (SPS), electric field-induced surface photovoltage spectroscopy (FISPS), UV-Vis diffuse reflectance spectrophotometry (UV-Vis), TEM, and XRD. XPS spectrum showed double peaks which accounted for the presence of platinum dioxide and platinum oxide (PtO 2 and PtO, PtO + ). Composition analysis showed that the particulate matters on surface of Pt-TNTs were composed of PtO + and TiO 2 . The results of SPS and FISPS demonstrated that the bound exciton showed sub-band gap transition characteristics with the asymmetric changes of photoelectric property corresponding to changes in polarity and strength of the external electric field. Furthermore, the influence of the changed microstructure morphology of Pt-doped TNTs on both the photovoltage spectroscopy and the lifetime of photogenerated carriers which occurred at the interfaces of Pt-TNTs was observed. Result of XRD indicated that a mixture of anatase and rutile phases prevailed in Pt-TNTs. Contact potential barriers consisting of PtO + , anatase, rutile, and PtO + are presumed to form upon PtO + particle that deposited on the surface of Pt-TNTs.

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“…The FISPS technique is a very sensitive method to investigate the photophysical process of excited states generated by light absorption of the aggregate state [50,51]. It is also applied to study the dissociation of photoinduced excitons in organic semiconductors [6]. The FISPS of pure and composite films of TBT and CuPc are given in figure 11(a).…”

Section: Surface Photovoltaic Properties Of the Pcd Filmsmentioning

confidence: 99%

“…In the composite system, copper (II) phthalocyanine (CuPc) derivatives are one of the extensively used components [1,2], because of their high chemical stability and outstanding photophysical properties [3][4][5]. Covalent bonding [6,7] and noncovalent functionalization [8][9][10] of CuPc derivatives with inorganic and/or organic nanomaterials are two widely studied processes, and noncovalent functionalization is favourably adopted due to its simplicity and convenience [11,12].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and charge/energy-transfer study of 4,7-bis(4-triphenylamino)benzo- 2,1,3-thiadiazole/CuPc composite films

Zhu

Wei

et al. 2010

J. Phys. D: Appl. Phys.

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Composite films of 4,7-bis(4-triphenylamino)benzo-2,1,3-thiadiazole (TBT) and copper phthalocyanine (CuPc) are fabricated via protonation-coelectrophoretic deposition from nitromethane solutions of TBT/CuPc mixture in the presence of trifluoroacetic acid as a protonation reagent. A nanospheres–nanowires interpenetrating network structure is obtained when the molar percentage of TBT is 70%. Furthermore, the existence of TBT makes α-phased CuPc be partly transformed into the β-phase, and simultaneously, CuPc disorganizes the TBT unit cells. The blue shift on the absorption edge of TBT and the significant fluorescence quenching in the composite films indicate energy/charge transfer and donor–acceptor (D–A) heterojunction formation. Then these results are proved from another point of view: the mutual overlap of absorption and emission spectra of TBT and CuPc lead to a bidirectional Förster resonance energy transfer at the interface; the molecular energy levels calculated from the results of cyclic voltammetry theoretically determine that there exist a D–A heterojunction and charge transfer from TBT to CuPc. Finally, from the investigation of the field-induced surface photovoltage spectra, it can be concluded that this charge transfer results in efficient dissociation of the photoinduced excitons in the composite films, followed by the generation of a strong photovoltage response.

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Synthesis, Photophysical Characterization, and Surface Photovoltage Spectra of Windmill‐Shaped Phthalocyanine–Porphyrin Heterodimers and Heteropentamers

Cited by 17 publications

References 43 publications

Fluorescence and FTIR Spectra Analysis of Trans-A2B2-Substituted Di- and Tetra-Phenyl Porphyrins

Fluorescence and FTIR Spectra Analysis of Trans-A2B2-Substituted Di- and Tetra-Phenyl Porphyrins

Synthesis and Characterization of the Optical Properties of Pt-TiO₂Nanotubes

Fabrication and charge/energy-transfer study of 4,7-bis(4-triphenylamino)benzo- 2,1,3-thiadiazole/CuPc composite films

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Synthesis, Photophysical Characterization, and Surface Photovoltage Spectra of Windmill‐Shaped Phthalocyanine–Porphyrin Heterodimers and Heteropentamers

Cited by 17 publications

References 43 publications

Fluorescence and FTIR Spectra Analysis of Trans-A2B2-Substituted Di- and Tetra-Phenyl Porphyrins

Fluorescence and FTIR Spectra Analysis of Trans-A2B2-Substituted Di- and Tetra-Phenyl Porphyrins

Synthesis and Characterization of the Optical Properties of Pt-TiO2Nanotubes

Fabrication and charge/energy-transfer study of 4,7-bis(4-triphenylamino)benzo- 2,1,3-thiadiazole/CuPc composite films

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Synthesis and Characterization of the Optical Properties of Pt-TiO₂Nanotubes