Unique protonation behavior of cationic free-base porphyrins in the interlayer space of transparent solid films comprising layered α-zirconium phosphate

2019 ◽  
Vol 60 (42) ◽  
pp. 150912 ◽  
Author(s):  
Takuya Fujimura ◽  
Yu-hei Aoyama ◽  
Ryo Sasai
Keyword(s):  
Zirconium Phosphate ◽  
Interlayer Space ◽  
Free Base ◽  
Solid Films

scholarly journals The Nature of Interactions and UV-Induced Response within α-Zirconium Phosphate Intercalation Compounds with Azobenzenes

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1436 ◽  
Author(s):  
Anna Koteja ◽  
Jakub Matusik ◽  
Katarzyna Luberda-Durnaś ◽  
Marek Szczerba
Keyword(s):  
Molecular Modeling ◽  
Zirconium Phosphate ◽  
Interlayer Space ◽  
Hydrophobic Interactions ◽  
Functional Materials ◽  
Structural Features ◽  
Solid Support ◽  
Induced Response ◽  
Low Density ◽  
Experimental Approaches

Azobenzenes immobilization on a solid support enables the usage of their trans-cis isomerization ability for preparation of functional materials. The behavior of azobenzenes in the interlayer space of α-zirconium phosphate (ZrP) upon the UV–Vis irradiation was investigated. Two experimental approaches were performed: (1) co-intercalation of benzylalkylammonium surfactants and azobenzene in the interlayers of ZrP (ZBCnA), and (2) intercalation of p-aminoazobenzene (ZpA). The materials were characterized with XRD, FTIR, UV–Vis, CHN analysis, and the molecular modeling. The molecules in ZBCnA samples were sparsely packed and held by weak hydrophobic interactions. Conversely, the molecules in ZpA sample were strongly H-bonded to the ZrP, well-ordered, and densely packed. These structural features determined the samples’ photoresponsive behavior. Low density of molecules in the ZBCnA samples, allowed the effective, fast, and reversible isomerization of azobenzene. Whereas the ZpA sample did not react to the UV irradiation because of the steric hindrance of tightly packed molecules.

scholarly journals THERMAL CHARACTERISTICS OF ZIRCONIUM PHOSPHATE NANOPARTICLES LOADED WITH DIRHENIUM(III) COMPLEXES

2019 ◽  
Vol 85 (5) ◽  
pp. 46-53
Author(s):  
Anastasiia Slipkan ◽  
Dina Kytova ◽  
Alexander Shtemenko
Keyword(s):  
Weight Loss ◽  
Complex Compound ◽  
Zirconium Phosphate ◽  
Interlayer Space ◽  
Thermal Transformation ◽  
Thermal Studies ◽  
Thermal Characteristics ◽  
Axial Position ◽  
Thermal Transformations ◽  
Molar Ratios

Using the method of differential thermal analysis and the method of isothermal effects, we investigated the thermal transformations of the inter-calation products of representatives of dirhenium(III) complexes of all structural types into the interlayer space of zirconium phosphate. Each of the samples was heated in the temperature range from 40 to 500 C. On the obtained thermograms of the samples, two main endothermic effects were observed, the first of which corresponds to the separation of water of crystallization from zirconium phosphate, and the second to the thermal transformations of dirhe-nium(III) complexes. The first weight loss for all intercalation products was 8.87–9.80%, that is, the percentage of water in the post samples was the same. The weight loss corresponding to the thermal transformation of dirhenium(III) complexes in the obtained nanoparticles was 6.15–11.24 and 12.30–29.90 % for molar ratios of the substance / zirco-nium phosphate, respectively, 1:30 and 1:5, which fully consistent with the proposed mechanism for the thermal decomposition of nanoparticles. As a result of research, it was determined that rhenium is not released from nanoparticles to the fullest extent when heated to 500 °C, which indicates the formation of nonvolatile products, such as ReO2. In addition, for some products of intercalation, such as trichlorotri-μ-carboxylates dirhenium(III), the weight loss is small compared with other representa-tives of nanoparticles, which is due to the difficult conversion of the complex compound as a result of the polymer structure of the complex. Thermal de-composition of phosphate ligands also prevents the complete elimination of the rhenium(III) compound due to the hydration of phosphate groups, which are coordinated in the axial position of the complex compound with the formation of pyrophosphates. Thus, the features of the behavior of samples during thermal studies are due to the structure of the com-plex compound formed in the interlayer space of zir-conium phosphate during the intercalation process.

The Structure and Development of Microbodies in the Fat Body and other Tissues of an Insect (Calpodes Ethlius)

1970 ◽  
Vol 28 ◽  
pp. 148-149
Author(s):  
M. Locke ◽  
J. T. McMahon
Keyword(s):  
Electron Microscopy ◽  
Liquid Crystals ◽  
Fat Body ◽  
Competitive Inhibitor ◽  
Dense Core ◽  
Urate Oxidase ◽  
Blood Proteins ◽  
Free Base ◽  
The Core ◽  
The Matrix

The fat body of insects has always been compared functionally to the liver of vertebrates. Both synthesize and store glycogen and lipid and are concerned with the formation of blood proteins. The comparison becomes even more apt with the discovery of microbodies and the localization of urate oxidase and catalase in insect fat body.The microbodies are oval to spherical bodies about 1μ across with a depression and dense core on one side. The core is made of coiled tubules together with dense material close to the depressed membrane. The tubules may appear loose or densely packed but always intertwined like liquid crystals, never straight as in solid crystals (Fig. 1). When fat body is reacted with diaminobenzidine free base and H2O2 at pH 9.0 to determine the distribution of catalase, electron microscopy shows the enzyme in the matrix of the microbodies (Fig. 2). The reaction is abolished by 3-amino-1, 2, 4-triazole, a competitive inhibitor of catalase. The fat body is the only tissue which consistantly reacts positively for urate oxidase. The reaction product is sharply localized in granules of about the same size and distribution as the microbodies. The reaction is inhibited by 2, 6, 8-trichloropurine, a competitive inhibitor of urate oxidase.

Free‐base tetra‐arylphthalocyanines for dye‐sensitised nanostructured solar cell applications

2001 ◽  
Vol 5 (8) ◽  
pp. 609-616 ◽  
Author(s):  
Viviane Aranyos ◽  
Johan Hjelm ◽  
Anders Hagfeldt ◽  
Helena Grennberg
Keyword(s):  
Solar Cell ◽  
Free Base

One-pot synthesis of silicon-based zirconium phosphate for the enhanced adsorption of Sr (II) from the contaminated wastewater

2021 ◽  
Vol 318 ◽  
pp. 111016
Author(s):  
Zihao Jiao ◽  
Yiguo Meng ◽  
Chunlin He ◽  
Xiangbiao Yin ◽  
Xinpeng Wang ◽  
...  
Keyword(s):  
Zirconium Phosphate ◽  
One Pot ◽  
One Pot Synthesis ◽  
Enhanced Adsorption ◽  
Silicon Based

scholarly journals Ultrafast Electron/Energy Transfer and Intersystem Crossing Mechanisms in BODIPY-Porphyrin Compounds

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 312
Author(s):  
Yusuf Tutel ◽  
Gökhan Sevinç ◽  
Betül Küçüköz ◽  
Elif Akhuseyin Yildiz ◽  
Ahmet Karatay ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Spectra ◽  
Visible Region ◽  
Energy Transfer Mechanism ◽  
Free Base ◽  
Pump Probe ◽  
Harvesting Efficiency ◽  
Probe Spectroscopy ◽  
Absorption Features ◽  
Transfer Mechanisms

Meso-substituted borondipyrromethene (BODIPY)-porphyrin compounds that include free base porphyrin with two different numbers of BODIPY groups (BDP-TTP and 3BDP-TTP) were designed and synthesized to analyze intramolecular energy transfer mechanisms of meso-substituted BODIPY-porphyrin dyads and the effect of the different numbers of BODIPY groups connected to free-base porphyrin on the energy transfer mechanism. Absorption spectra of BODIPY-porphyrin conjugates showed wide absorption features in the visible region, and that is highly valuable to increase light-harvesting efficiency. Fluorescence spectra of the studied compounds proved that BODIPY emission intensity decreased upon the photoexcitation of the BODIPY core, due to the energy transfer from BODIPY unit to porphyrin. In addition, ultrafast pump-probe spectroscopy measurements indicated that the energy transfer of the 3BDP-TTP compound (about 3 ps) is faster than the BDP-TTP compound (about 22 ps). Since the BODIPY core directly binds to the porphyrin unit, rapid energy transfer was seen for both compounds. Thus, the energy transfer rate increased with an increasing number of BODIPY moiety connected to free-base porphyrin.

Electrochoromic Display Using V2O5 Amorphous Thin Solid Films

1988 ◽  
Vol 17 (3) ◽  
pp. 76-78
Author(s):  
Ramakuru N. Prasad ◽  
Abayankar Neelima ◽  
R. N. Karekar
Keyword(s):  
Thin Solid Films ◽  
Solid Films
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