Miao Yu

Synthesis, spectroscopy, surface photovoltage, and electrochemical properties of porphyrin compound liquid crystals

Two series of porphyrin liquid crystalline compounds, meso-tetra-[(p-alkacyloxy-m-ethyloxy)phenyl]porphyrin (TPAMEP), and [5-(p-alkacyloxy) phenyl-10,15,20-tri-phenyl] porphyrin (APTPP) are synthesized and display a hexagonal columnar discotic columnar (Colh) phase. Their structure and properties were studied by elemental analysis, molar conductance, UV-visible and infrared spectra. Luminescence spectra of the compounds were discussed. Quantum yields of the Q band are in the region 0.007935-0.05847. The electrochemical studies show that the redox potentials do not change with the variation of the chain length. The surface photovoltage (SPV) response of the compounds was investigated by means of surface photovoltage spectroscopy (SPS) and field-induced surface photovoltage spectroscopy (FISPS), and the bands are analogous with the UV-visible absorption spectra.

Unsymmetrical Porphyrin and Its Two Groups of Lanthanide Complexes: Synthesis, Spectroscopy, and Thermal Analysis

A new unsymmetrical porphyrin, 5-[p-(4-flourobenzoyloxy)]phenyl-10,15,20-triphenyl porphyrin and its two groups of lanthanide complexes, hydroxyl porphyrin complexes and acetylacetonate porphyrin complexes were synthesized. They were characterized by elemental analyses, molar conductance, UV-Vis, IR, and 1H NMR spectra. Characterization techniques indicated that both hydroxyl and porphyrin were coordinated to the lanthanide ion to form pentadentate lanthanide complex. Their luminescent properties were studied by excitation and emission spectra, Quantum yields of Q band fluorescence complexes are in the region 0.0032–0.169 at room temperature. Porphyrin can be used as antenna to sensitize lanthanide ions. They have potential application as fluorescence probes. Differential thermal analysis showed that they all have higher stability (decompose only at 200°C).

Synthesis and characterization of a new unsymmetrical porphyrin liquid crystal and its lanthanide complexes

A meso-substituted unsymmetrical porphyrin liquid crystal, 5-(4-myristyloxy)phenyl-10,15,20-triphenyl porphyrin, and a series of its lanthanide complexes, (lanthanide ions: Gd, Tb, Dy, Ho and Er) with acetylacetone were synthesized and characterized by elemental analyses, molar conductances, UV-Vis, IR and 1H NMR spectra. A structure is proposed in which the porphyrin is as a tetradentate ligand and acetylacetonate is bidentate to the lanthanide. Luminescence spectra show that quantum yields of the Q band fluorescence are in the region 0.027–0.191. DSC data and an optical textural photo using a polarizing microscope indicates that the compounds have liquid crystalline character.

Liquid-Crystalline Properties of Meso-tetra [(p-alkoxyl-m-ethyloxy)phenyl]Porphyrins and Their Transition Metal Complexes

Three, novel, meso-tetra[(p–alkoxyl–m-ethyloxy)phenyl]por- phyrins and their transition metal complexes were synthesized. Mesomorphic studies using DSC, polarizing optical microscope, and X-ray diffraction revealed that eleven compounds (2 ligands and 9 complexes) are room-temperature liquid crystalline materials.

Synthesis and characterization of SBA-15 in presence of Zn (II) tetraphenylporphyrin and study of its luminescent property

ABSTRACT The metalloporphyrin Zn (II) tetraphenylporphyrin was incorporated into mesoporous molecular sieves SBA-15 by the interaction of the π electrons of the metalloporphyrin with the superficial hydroxyl groups of the SBA-15. The resultant material confirmed that the channels of SBA-15 have been filled with the metalloporphyrins by means of XRD, TEM, solid UV/Vis, FT-IR, nitrogen adsorption, and TGA. Luminescent properties were studied by solid fluorescence emission and excitation spectra. Results indicate that luminescent property of SBA-15/metalloporphyrin is better than that of the pure metalloporphyrin.

Synthesis and Characterization of a New Proline Tailed Porphyrin and Its Metalloporphyrin Complexes

In this study, the authors synthesized and characterized a new proline tailed porphyrin, 5-[4-N-(tert-butoxycarbonyl)-L-prolinecoxyl propyloxy]phenyl-10,15,20-triphenylporphyrin and its metalloporphyrin complexes. The porphyrins 1–4 have been characterized by UV/Vis, IR, NMR, MS and CD spectra techniques. And the structure of the compounds was confirmed by analyzing of those spectra. Furthermore, the CD spectrum studies showed that porphyrins 1–4 have chiral molecule, and their CD spectra were split in the Soret band and have cotton effect. Metalloporphyrin coordination ability and the optimum configuration of these metalloporphyrin complexes were calculated by chemical simulation. Besides, the coordination ability of porphyrin 1 and its Zn, Ni, Co complexes were predicted. According to the result of optimization and quantitative molecular calculation, shows the most stable structure at all of possible structure in the subject molecule and object molecule.

5, 10, 15, 20-Tetra (N-Long Chain-Alkyl Carbazole) Porphyrin and Their Lanthanide Complexes

Three novel 5, 10, 15, 20-tetra [n–CnH2n+1–alkyl (n = 12, 14, 16) carbazole] porphyrin and their lanthanide complexes (Dy (III), Ho (III), Er (III), Gd (III)) have been synthesized. These compounds were characterized by methods of UV-Vis, IR, 1H NMR, TGA-DTA, and molar conductance. Besides, the electronic properties of compounds were studied by cyclic voltammetry. Their emission spectra indicated that the Φf and intensity of fluorescence of compounds decrease after the ligand coordinating with rare earth metal. Results indicate that Gd porphyrin complex (2d) has the strongest intensity of fluorescence in all the lanthanide complexes. Also, it is proved that all these compounds show nonelectrolytic behavior.

Synthesis and Properties Study of Asymmetrical Carbazole Porphyrin With p-Hydroxylphenyl and Its Metal Complexes (Zn, Dy)

A novel, carbazole-substituted, asymmetrical porphyrin derivatives, 5-[p-hydroxyl phenyl]-10, 15, 20–tricarbazole porphyrin and its metal (Zn, Dy) complexes have been synthesized and characterized by means of UV-vis spectra, IR spectra,1H NMR spectra, and MS. Luminescent properties were discussed by fluorescent spectrum, and their high thermal stability was explained by thermal analytical results. The oxidation and reduction properties of the compounds were investigated by cyclic voltammetry.

Synthesis and Characterization of Six N-(long-alkyl)-carbaldehyde

Six carbazole aldehyde compounds were synthesized and characterized by 1 H NMR, UV-Vis, and IR spectroscopy. Fluorescence spectroscopy was also discussed, and they all have strong fluorescence. The thermal properties of compounds were studied by TGA-DTA. The compounds are considered to be promising and assistant materials for organic photo-electronic functional materials.

Lanthanide Porphyrin Complexes: Synthesis and Properties

A new meso-substituted unsymmetrical porphyrin, 5-(4-myristyloxy)phenyl- 10,15,20-triphenyl porphyrin, and a series of its hydroxy lanthanide complexes, (lanthanide ions: Gd, Tb, Dy, and Ho) were synthesized and characterized by elemental analyses, molar conductances, UV-Vis, IR and 1H NMR spectra. Their luminescent properties are studied by emission spectra. Q (0-0) fluorescence bands of the complexes are in the region 649–650 nm and Q (0-1) bands 714–715 nm. Quantum yields (Φf) of Q band for the complexes are in the range 0.00151–0.08433 and ligand 0.07459.