Article
Chemistry, Inorganic & Nuclear
G. S. Amitha, Suni Vasudevan
Summary: A new chromium phthalocyanine complex substituted with 8-quinolinoxy group was synthesized using modified precursor 4-(8-quinolinoxy) phthalonitrile in the presence of CrCl3 center dot 6H(2)O and zinc dust as the reducing agent in DMAE. The resulting product exhibited green florescence and showed dual emission peaks at 510 nm and 686 nm, with the former responsible for intense green emission. The study also revealed that the abnormal peak at 510 nm was due to a combined effect of radiative relaxation and LMCT.
Article
Chemistry, Multidisciplinary
Joanna Musial, Artium Belet, Dariusz T. Mlynarczyk, Michal Kryjewski, Tomasz Goslinski, Stephanie D. Lambert, Dirk Poelman, Beata J. Stanisz
Summary: In this study, composites based on TiO2 and metallophthalocyanines were prepared, characterized and tested for photoactivity. The composites showed lower band-gap energy and higher photocatalytic activity compared to commercial TiO2 P25 or unsubstituted zinc(II) phthalocyanine-grafted TiO2. Chemical deposition was found to be a simple and efficient method for modifying TiO2 surface with phthalocyanines.
Article
Chemistry, Physical
Ekrem Kaplan, Tolga Karazehir, Selin Gumrukcu, Baran Sarac, A. Sezai Sarac, Esin Hamuryudan
Summary: In this study, nanohybrid electrocatalyst materials based on carboxylic acid substituted copper phthalocyanines (CuPcs) and reduced graphene oxide (rGO) were investigated for their electrocatalytic activity in the hydrogen evolution reaction (HER). The electrodes with peripherally substituted rGO/CuPc showed higher efficiency and activity compared to the non-peripherally substituted ones. The enhanced performance of the peripherally carboxylic substituted rGO/CuPc electrodes was attributed to the improved conductivity and electron transfer kinetics.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Engineering, Environmental
Xiuli Dong, Chun Wang, Mingyang Zhang, Siqi Ji, Leipeng Leng, J. Hugh Horton, Hongliang Dong, Man Qiao, Yu Wang, Jiangwei Zhang, Zhijun Li
Summary: This study presents a straightforward and efficient approach to accessing single ruthenium atoms on a Bi2WO6 surface, resulting in a catalyst with enhanced catalytic performance through synergistic geometric and electronic effects. The reaction shows high conversion, selectivity, and turnover frequency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Mucahit Ozdemir, Gamze Ozgul Artuc, Barbaros Akkurt, Bahattin Yalcin, Umit Satan, Mahmut Durmus, Mustafa Bulut
Summary: A series of phthalocyanine derivatives were synthesized in this study, and their fluorescence behavior, singlet oxygen generation, and photostability properties were investigated. These compounds may serve as potential photosensitizers for photodynamic therapy and warrant further study.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Analytical
Anshul Kumar Sharma, A. K. Debnath, D. K. Aswal, Aman Mahajan
Summary: Carbon nanotubes (CNTs) have unique properties that make them suitable for gas sensing applications, but their long recovery time and limited sensing properties at different temperatures have been a challenge. A hybrid sensor combining single-walled carbon nanotubes with alkoxy substituted phthalocyanine showed improved Cl2 sensing characteristics at room temperature, with a detection limit of up to 1.33 ppb. Characterization of the hybrid sensor revealed increased surface area compared to SWCNTs-COOH, and the interaction between the sensor and gas analytes was explored through spectroscopic studies.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Applied
Zekeriya Biyiklioglu, Huseyin Bas, Didem Akkaya, Burak Barut
Summary: In this study, water-soluble metallophthalocyanines were synthesized and their inhibitory properties on cholinesterases were investigated. The compounds showed significant inhibitory effects on cholinesterases, with DM-C6-MnQ being the strongest inhibitor.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Semih Gorduk
Summary: In this study, a series of phthalocyanine compounds containing carboxylic acid moieties with good solubility were synthesized and investigated. The presence of metal ions was found to increase the singlet oxygen generation efficiency, potentially making these compounds suitable for photodynamic therapy applications.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Gulnur Keser Karaoglan
Summary: This study synthesized a novel photosensitizer and calculated its singlet oxygen quantum yield using sono-photochemical methods. The results showed that the sono-photochemical method exhibited higher efficiency in singlet oxygen production when compared to the photochemical method.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Chemistry, Analytical
Duygu Akyuz, Hakki Turker Akcay, Riza Bayrak
Summary: Novel peripherally tetra 1,3-diethoxy-2-propanol substituted Co(II), Cu(II), Mg(II), Ni(II) and Zn(II) phthalocyanine derivatives were prepared and characterized by various techniques. Electrochemical and spectroelectrochemical measurements were carried out to determine the redox properties, reaction mechanism, and the influence of substituents and metal centers. Color properties and aggregation tendency of the compounds were also investigated in this study.
Article
Chemistry, Multidisciplinary
Yusuke Nakayama, WooJin Kim, Yuki Nishikawa, Akihiko Fujii, Masanori Ozaki
Summary: The carrier mobility of CnTBTAPH(2) for organic thin-film solar cells was measured using the MIS-CELIV method. It was found that the carrier mobility decreased sequentially with increasing alkyl-chain length, and this dependence was discussed by considering the activation energy and inter-column spacing.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2021)
Article
Materials Science, Multidisciplinary
Efe Baturhan Orman, Zuhal Yazar, Mehmet Piskin, Zafer Odabas, Ali Riza Ozkaya
Summary: Non-peripherally tetra-2,6-dimethoxyphenoxy substituted Co(II) 3, Fe(II) 4, Mn(III) 5, and Ni(II) 6 phthalocyanines were synthesized and their molecular structures were explained. These complexes showed good solubility in various solvents and exhibited electrochemical and spectroscopic properties. Some of the complexes also displayed electrocatalytic oxygen reducing activity and electrochromic functionality.
Article
Chemistry, Inorganic & Nuclear
Shi Hoe Ng, Weng Kee Leong
Summary: The solution-state isomers of the heteronuclear cluster RuOs3(mu-H)(2)(CO)(12)(PPh3) were re-examined, leading to a reassignment of the structures and exchange processes observed in the NMR spectra.
INORGANICA CHIMICA ACTA
(2021)
Article
Physics, Applied
Masataka Fujisaki, Akihiko Fujii, Makoto Yoneya, Norimitsu Tohnai, Masanori Ozaki
Summary: This study investigated the origin of negative temperature dependence of carrier mobility in a crystal phase of 1,4,8,11,15,18,22,25-octahexylphthalocyanine using charge transport simulation based on Marcus theory and density functional theory. The theoretical calculations considered thermal expansion of lattice parameters and showed similar temperature dependence with experimental results for hole mobility. The negative temperature dependence in electron mobility calculation was simulated by considering degeneracy of lowest unoccupied molecular orbitals and thermal expansion.
APPLIED PHYSICS EXPRESS
(2021)
Article
Chemistry, Physical
Umit Demirbas, Ipek Omeroglu, Hakki Turker Akcay, Mahmut Durmus, Halit Kantekin
Summary: In this study, phthalocyanines with different substituents were synthesized and their photophysical and photochemical properties were investigated in DMSO solutions. Zinc(II) phthalocyanine showed higher singlet oxygen quantum yield compared to metal-free and magnesium(II) phthalocyanine. Additionally, the fluorescence quenching behaviors of phthalocyanines by 1,4-benzoquinone were studied.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Chemistry, Organic
Maretha du Plessis, Charlene Marais, Barend C. B. Bezuidenhoudt
SYNTHESIS-STUTTGART
(2016)
Article
Chemistry, Inorganic & Nuclear
Marthinus Rudi Swart, Linette Twigge, Charlene Marais, Barend Christiaan Buurman Bezuidenhoudt
Article
Crystallography
Jireh B. M. Smit, Charlene Marais, Frederick P. Malan, Barend C. B. Bezuidenhout
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
(2019)
Article
Crystallography
Jireh B. M. Smit, Charlene Marais, Frederick P. Malan, Barend C. B. Bezuidenhout
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
(2019)
Article
Chemistry, Inorganic & Nuclear
M. R. Swart, Barend C. B. Bezuidenhoudt, C. Marais, E. Erasmus
Summary: By studying the influence of p-Cresol derivatives on the Grubbs 2nd generation catalyst, it was found that coordination occurred between them, and the interaction of p-Cresol with the complexes had an impact on the electronic effects of the complexes.
INORGANICA CHIMICA ACTA
(2021)
Article
Chemistry, Inorganic & Nuclear
Marthinus R. Swart, Linette Twigge, Elizabeth Erasmus, Charlene Marais, Barend C. B. Bezuidenhoudt
Summary: The use of p-cresol as an additive in the Grubbs second generation catalyst facilitates the cross-metathesis of acrylates with prop-1-en-1-ylbenzenes. The interaction between p-cresol and GII leads to the formation of a ruthenium benzylidene with hydrogen bonds, altering the electron densities on the metal center and the carbene.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Marthinus Rudi Swart, Charlene Marais, Elizabeth Erasmus
Summary: The metathesis reaction between 1-hexene and (E)-anethole in the presence of Grubbs 2nd generation catalyst was monitored using in situ H-1 NMR spectroscopy at different temperatures and anethole mol fractions. The highest concentration of the cross-metathesis product was found to be more dependent on the anethole mol fraction rather than the temperature, with a preliminary kinetic study suggesting the secondary metathesis reaction follows first order kinetics.
Article
Chemistry, Multidisciplinary
Marthinus R. Swart, Charlene Marais, Elizabeth Erasmus
Summary: Based on UV-vis spectroscopy and 31P NMR analysis, it was found that there are differences in the transformation rate constants, transformation percentages, and oxidation potentials between Grubbs' first and second generation catalysts. The reaction of 1 proceeds according to an ErCi electrochemical mechanism, while that of 2 proceeds according to an ErCr electrochemical mechanism.
Review
Chemistry, Organic
David I. H. Maier, Barend C. B. Bezuidenhoudt, Charlene Marais
Summary: The dibenzo[b,f]azepine skeleton is of great significance in the pharmaceutical industry due to its use in existing antidepressants, anxiolytics, and anticonvulsants, as well as its potential in other applications such as organic light emitting diodes and dye-sensitized solar cell dyes. This review provides an overview of the synthetic strategies for dibenzo[b,f]azepines and other dibenzo[b,f]heteropines, as well as their applications in different fields.
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Jeanette van Jaarsveldt, Charlene Marais, Johannes H. H. van Tonder, Barend C. B. Bezuidenhoudt
Summary: Due to their various pharmacological properties, such as antioxidant, anti-inflammatory, and antimicrobial activities, flavonoids have been extensively studied for their medicinal and therapeutic applications. However, there are only a few reported methods for the preparation of flavan-3,4-diols, which play a central role in the synthesis of other classes of flavonoids. In this paper, the authors disclose the results of a 3-step process for the preparation of methoxy-substituted flavan-3,4-diols with natural substitution patterns from readily available starting materials. They also indicate that 4-aryl-substituted analogues can be obtained from the corresponding flav-3-enes by adding an aromatic nucleophile during the dimethyldioxirane (DMDO) epoxidation process.
SYNTHESIS-STUTTGART
(2023)
Article
Chemistry, Organic
Tanya Pieterse, Charlene Marais, Barend C. B. Bezuidenhoudt
Summary: Isoflav-3-enes with natural substitution patterns were synthesized through a one-pot Wittig methylenation - etherification - Wittig methylenation reaction, followed by ring-closing metathesis catalyzed by the Grubbs second generation catalyst. This method achieved the synthesis of a series of novel 1-[(2-phenylallyl)oxy]-2-vinylbenzenes in good yields (61 - 89%). Olefin metathesis thus provides a common strategy for the synthesis of all three flavonoid subclasses, i.e. the flavonoids, neoflavonoids and isoflavonoids.
Article
Chemistry, Organic
Johannes H. van Tonder, Charlene Marais, Barend C. B. Bezuidenhoudt
Summary: In this paper, modifications to the syntheses of symmetrical octa-substituted metal-free phthalocyanines (H2Pc) are reported. H2Pcs with peripheral or non-peripheral alkyl substituents were prepared in less steps and in higher yields than previously reported, whereas the yields of H2Pcs with alkoxy substituents (peripheral or non-peripheral) were improved considerably.
Article
Chemistry, Organic
Tanya Pieterse, Charlene Marais, Barend C. B. Bezuidenhoudt
Summary: The Tebbe methylenation and Grubbs second generation catalyst ring-closing metathesis were investigated as crucial steps in the synthesis of flav-2-enes with natural substitution patterns. The study discusses the influence of aromatic substituents on the electron densities of allyl and vinyl moieties and their effects on methylenation and ring-closing metathesis.
Article
Multidisciplinary Sciences
M. R. Swart, Barend C. B. Bezuidenhoudt, C. Marais, E. Erasmus
Summary: The article presents data related to the spectroscopic characterisation of a p-cresol derivative of the Grubbs 2nd generation catalyst, where a chloride ligand is replaced by p-cresolate to form a Ru-O coordination compound. The characterization data obtained from various NMR techniques provide insights into the structure of this compound.
Article
Chemistry, Organic
Maretha du Plessis, Charlene Marais, Barend C. B. Bezuidenhoudt
