Search

The newly synthesized cyclotriphosphazene cored coumarin chemosensors 5, 6, and 7 were successfully characterized by 1 H NMR, 31 P NMR, and MALDI-TOF mass spectrometry. Additionally, the photophysical and metal sensing properties of the targeted compounds were determined by fluorescence spectroscopy in the presence of various metals (Li + , Na + , K + , Cs + , Mg 2+ , Ca 2+ , Ba 2+ , Cr 3+ , Mn 2+ , Fe 3+ , Co 2+ , Al 3+ , Hg + , Cu 2+ , Zn 2+ , Ag + , and Cd 2+ ) . The fluorescence titration results showed that compounds 5, 6, and 7 could be employed as fluorescent chemosensors for Fe 3+ ions with high sensitivity. The complex stoichiometry between final cyclotriphosphazene chemosensors and Fe 3+ ions was also determined by Job's plots., Competing Interests: CONFLICT OF INTEREST: none declared, (Copyright © 2020 The Author(s).)

Herein, a novel one step synthesis of multicomponent three dimensional polyacrylic acid (PAA) based conducting hydrogel (CH) incorporated with iron phthalocyanine functionalised graphene nanoplatelets (GPL-FePc) is reported. An amperometric glucose biosensor was fabricated by the immobilization of glucose oxidase (GOx) onto the synthesised PAA-VS-PANI/GPL-FePc-CH (where VS-PANI is vinyl substituted polyaniline). Scanning electron microscopy reveals the presence of three dimensional microporous structure with estimated pore size of 19 μm. The 5-(trifluoromethyl)-2-mercaptopyridine substitution onto FePc enabled the solubility of FePc in water and controls the aggregation of GPL-FePc in the synthesised CH. A sharp peak around 699 nm in UV-visible spectra confirms the presence of incorporated GPL-FePc into CH. Cyclic voltammogram of the synthesised CH biosensor exhibited well defined redox peaks with a ΔE p value of 0.26 V in Fe(CN) 6 3-/4- bench mark solution. The fabricated PAA-VS-PANI/GPL-FePc/GO x -CH amperometric biosensor resulted in remarkable detection sensitivity of 18.11 μA mM -1  cm -2 with an average response time of ∼1 s, linearity from 1 to 20 mM, and low detection limit of 6.4 μM for the determination of glucose., (Copyright © 2019 Elsevier B.V. All rights reserved.)

A sensitive bromate sensor was developed using nickel phthalocyanine multi-walled carbon nanotubes nanocomposite modified on a glassy carbon electrode. The NiPcMWCNTs nanocomposite was prepared from nickel nanoparticles, phthalocyanine, and functionalized MWCNTs via ultrasonication. UV–visible spectroscopy, SEM, XRD, TEM, and EDX techniques were used to verify the successful fabrication of the nanomaterials. The results of the EIS and CV experiments conducted in 5 mM K3(Fe(CN)6/K4(Fe(CN)6 made in 0.1 M of PBS (pH 7) revealed that the NiPcMWCNTs/GCE exhibited higher current response, faster electron transfer, and high specific capacitance compared to other electrodes. The electrochemical reduction of bromate was actualized in 0.1 M H2SO4 (pH 1) using EIS and SWV techniques. Using the EIS technique, an LoD of 6.72 μM was obtained with a sensitivity of 483.7 μA μM−1 over a linear dynamic range (LDR) of 24–100 μM. Whereas, with the SWV technique, a lower LoD (1.47 μM) was obtained with a higher sensitivity (1293 μA μM−1) over an LDR of 12–56 μM. The developed sensor was characterized by good selectivity, high stability (95.5%), and good reproducibility (% RSD; 3.5%). The fabricated sensor was effectively used to detect bromate in bread samples with a good recovery rate, demonstrating the practical application of the sensor to detect bromate in real samples (bread). [ABSTRACT FROM AUTHOR]

In this research, different number of the 4,4-difluoro-4-bora-3a,4a,8-triaza-s-indacene (aza-BODIPY) molecule has been employed to design novel oligomers with considerable electrical and optical properties. The geometries of the designed oligomers were optimized and the IR frequency and cohesive energy were calculated to study their stability. To explore their electronic properties, the HOMO, LUMO energies and Eg of designed oligomers were calculated. It was shown that by enlarging the size of oligomer and increase in number of aza-BODIPY units in designed oligomers, their Eg was narrowed. Finally, it was found that as the numbers of aza-BODIPY units in the oligomers increased, a great enhancement in optical properties was observed. Significant optical properties with strong absorption lines were seen in the visible and near-infrared regions for designed oligomer with six and seven aza-BODIPY units. [ABSTRACT FROM AUTHOR]

The novel pyridine bearing schiff base substituted metal-free (9), zinc(II) phthalocyanine (10), and its quaternized derivative (11) were designed and synthesized. These phthalocyanines were fully characterized by spectroscopic methods (FT-IR, UV–Vis, MALDI-TOF, and 1 H NMR). The photo-physicochemical properties of these phthalocyanines were investigated in both DMSO and DMF for 10 and in both DMSO and aqueous solution for 11. The addition of pyridine bearing Schiff base groups as peripheral ligands showed an improvement in the photophysical and photochemical properties. In addition, a spectroscopic investigation of the binding behavior of the water-soluble zinc (II) phthalocyanine complex to bovine serum albumin (BSA) was also studied in this work. [ABSTRACT FROM AUTHOR]

Copyright of Thélème is the property of Universidad Complutense de Madrid and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

What is fascinating about Murat Isik's novel Wees onzichtbaar is that so many different groups of people greatly appreciate this book, from the juries of the literary prizes, to the literary-oriented readers in the countless reading clubs in the Netherlands, and from the viewers of the TV programs De leesclub van M. and Koffietijd, to the students and the booksellers. This article examines how the novel brings about that enthusiasm about Isik's storytelling and which narrative aspects could play a role in it. After the main storylines have been mapped, the storytelling perspective and some storytelling techniques are discussed. In addition, attention is paid to the novel Wees onzichtbaar as a 'coming of age' novel, in the broader perspective of multicultural diversity and cultural differences in a multicultural society. Nederlandstalige abstract Het fascinerende aan Murat Isiks roman Wees onzichtbaar is dat zoveel verschillende groepen mensen, zowel de jury's van literaire prijzen als de literair georiënteerde lezers in de talloze leesclubs in Nederland, de kijkers van de tv-programma's De leesclub van M. en Koffietijd, de studenten en de boekverkopers dit boek enorm waarderen. In dit artikel wordt onderzocht hoe de roman het enthousiasme over de vertelkunst van Isik teweegbrengt en welke narratieve aspecten daarin een rol kunnen spelen. Nadat de belangrijkste verhaallijnen in kaart zijn gebracht, worden het vertelperspectief en enkele verteltechnieken besproken. Daarnaast is er aandacht voor de roman Wees onzichtbaar als een 'coming of age'-roman, in het bredere perspectief van multiculturele diversiteit en culturele verschillen in een multiculturele samenleving. [ABSTRACT FROM AUTHOR]

In this research, the BODIPY molecule was selected; and based on its structure, using a different number of BODIPY molecules connected to each other, novel oligomers with significant electrical and optical properties were designed. After structural optimization, the frequency analysis and cohesive energy calculations were done to ensure the oligomers' stability. The electronic properties of the designed oligomers were studied; and it was shown that by increasing the numbers of BODIPY molecules in designed structures, their Eg was narrowed. Finally, it was shown that by increasing the numbers of BODIPY molecules in oligomers, a great improvement in optical properties such as increasing the number of absorption lines and intensity of them was observed. Among the designed oligomers, two di- and tri-BODIPY molecules have substantial optical properties with intense absorption lines in visible and near-infrared regions. [ABSTRACT FROM AUTHOR]

Phenyl-4,4-di(3,6-dibutoxyphthalonitrile) (3) was synthesized by the reaction of 1,4-phenylenebisboronic acid (1) and 4-bromo-3,6-dibutoxyphthalonitrile (2), using Suzuki cross-coupling reaction. The newly synthesized compound (3) was characterized by FT-IR, MALDI-MS, ESI-MS, ¹H-NMR, 13C-NMR, and 13C-DEPT-135-NMR. The fluorescence property of phenyl-4,4-di(3,6- dibutoxyphthalonitrile) (3) towards various metal ions was investigated by fluorescence spectroscopy, and it was observed thatthe compound (3) displayed a significantly 'turn-off' response to Fe3+, which was referred to 1:2 complex formation between ligand (3) and Fe3+. The compound was also studied via density functional theory calculations revealing the interaction mechanism of the molecule with Fe3+ ions. [ABSTRACT FROM AUTHOR]

In this work, hybrid materials of single-walled carbon nanotubes (SWCNT) noncovalently functionalized with fluoroalkyl- (SWCNT/ZnPc-CF) and alkyl- (SWCNT/ZnPc-CH) substituted zinc(II) phthalocyanines were prepared. The effect of fluorination of the substituents in phthalocyanine macrocycle on the functionalization degree of carbon nanotubes and sensor response to ammonia was investigated. It was shown that the type of substituents in the phthalocyanine macrocycle showed noticeable effect both on the degree of functionalization of carbon nanotubes and on the sensing performance of the investigated hybrids. The amount of phthalocyanine molecules adsorbed on SWCNT walls was shown to be 1.5 times higher in the SWCNT/ZnPc-CH hybrid. The SWCNT/ZnPc-CF layer exhibited 2 times less chemiresistive sensor response to ammonia than SWCNT/ZnPc-CH, while its sensor response was more stable at 70% relative humidity. [ABSTRACT FROM AUTHOR]

This work aimed to reveal the influence of premixed cosolvent addition to low conductive PEDOT:PSS solution and how the optimized thin film conductivity develops. PEDOT:PSS thin films were obtained by addition of EG and MeOH cosolvent mixture (8, 10, and 15 v/v.%) and the morphological, electrical, optical, and bandgap properties of the films obtained were characterized by different techniques. The addition of mixed cosolvent can effectively control the grain size distribution and thus the conductivity. The optical characterization results revealed that the bandgap decreased with increasing volume of mixed cosolvent. The conductivity characteristics showed that the addition of 10% v/v.% EG-MeOH blend to low conductive PEDOT:PSS solution is optimal. Polymer solar cells (PSCs) were produced with a configuration of ITO/PEDOT:PSS/P3HT:PCBM/Al, which is one of the most common configurations examined. The highest efficiency of 2.7% was achieved, which resulted in a 20% enhancement (2.2%) compared to the control device. [ABSTRACT FROM AUTHOR]

In this work, a new cobalt phthalocyanine derivative bearing 5-(trifluoromethyl)-2-mercaptopyridine substituents (CoPc) was synthesized and characterized. The redox properties of CoPc were studied by cyclic voltammetry (CV) and square wave voltammetry (SWV) methods. The sensing performance of CoPc thin films deposited by spin coating of its solution in ethylacetate was studied against low concentrations of ammonia (0.3 to 50 ppm) by measuring changes in the films' conductivity at different humidity. It has been shown that the CoPc-based sensor displays an improved ammonia sensing performance in terms of sensitivity, response and recovery times. Ammonia can be detected in the presence of volatile organic vapors, and its detection limit was found to be 0.3 ppm. At the same time, low concentrations of CO2 comparable with the concentrations of ammonia do not influence on the sensitivity of CoPc film to ammonia, however the sensor response noticeably distorts in the presence of high CO2 concentrations in the gas mixture. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Theoretical Educational Science / Kuramsal Eğitimbilim Dergisi is the property of Afyon Kocatepe University, Faculty of Education and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electronic Turkish Studies is the property of Electronic Turkish Studies and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In 1690, on the orders of Simon van der Stel, officials of the Verenigde Oostindische Compagnie (VOC) interviewed one Nicolao Almede, a 'free black man of Mozambique' who had recently arrived at the Cape as a sailor aboard the English ship John and Mary. Almede informed his interlocutors about the country inland from the coast between Mozambique and Delagoa Bay (now Maputo Bay), into which he had previously ventured as a merchant. Although he does not mention the legendary name of Monomotapa, he does offer early descriptions of the Changamire dynasty, as well as the animals and people of the region, including its fabulous wealth. Some of the place names he mentioned are well known, while others cannot now be traced, perhaps because he was using indigenous rather than Portuguese names. The record of the interview concludes with Almede's description of mermaids, and the fact that their teeth could be had in the market at Mozambique. Together with producing a transcription and translation of the document this article explores it through a close reading to offer some speculations about the interweaving of legend and fact in the human and natural history of southern Africa in reports such as that of Almede. [ABSTRACT FROM AUTHOR]

Copyright of Electronic Turkish Studies is the property of Electronic Turkish Studies and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)