Diverse composites of metal-complexes and PEDOT facilitated by metal-free vapour phase polymerization

2017 ◽  
Vol 116 ◽  
pp. 101-106 ◽  
Author(s):  
Shravan S. Acharya ◽  
Christopher D. Easton ◽  
Thomas M. McCoy ◽  
Leone Spiccia ◽  
C. André Ohlin ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Vapour Phase ◽  
Metal Free

Electrodeposition of catalytically active polyporphyrin films of metal complexes of amino-substituted tetraphenylporphyrins

2018 ◽  
Vol 22 (12) ◽  
pp. 1047-1053 ◽  
Author(s):  
Mariya V. Tesakova ◽  
Mitar Lutovac ◽  
Vladimir I. Parfenyuk
Keyword(s):  
Metal Complexes ◽  
Quartz Crystal ◽  
Film Growth ◽  
Metal Free ◽  
Porphyrin Ligand ◽  
Catalytically Active ◽  
Microscopy Method ◽  
Scanning Electron Microscopy Method ◽  
Electron Microscopy Method ◽  
Scanning Electron

The process of electrodeposition of polyporphyrin films based on amino-substituted tetraphenylporphyrins and their metal complexes (CuT([Formula: see text]-NH[Formula: see text]Ph)P, FeClT([Formula: see text]-NH[Formula: see text]Ph)P, MnClT([Formula: see text]-NH[Formula: see text]Ph)P) has been studied by the quartz crystal microbalance method. The surfaces of the films have been characterized by the scanning electron microscopy method and the number of electrons taking part in porphyrin electropolymerization has been determined. It has been established that the most intensive film growth is observed for the metal-free porphyrin ligand. The obtained polyporphyrin films have been analyzed for the catalytic ability in oxygen electroreduction reactions.

scholarly journals RECENTES APLICAÇÕES DO ORGANOFOTOCATALISADOR 1,2,3,5-TETRAQUIS(CARBAZOL-9-IL)-4,6- DICIANOBENZENO EM TRANSFORMAÇÕES QUÍMICAS

Química Nova ◽  
2020 ◽  
Author(s):  
Lucas Pugnal ◽  
Emanuele Pissinati ◽  
Karina Quaglio ◽  
Márcio Paixão
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Chemical Transformations ◽  
Redox Potentials ◽  
Research Groups ◽  
Organic Fluorophores ◽  
Metal Free ◽  
Polypyridine Complexes ◽  
Distinguished Research

RECENT APPLICATIONS OF THE ORGANIC PHOTOCATALYST 1,2,3,5-TETRAKIS(CARBAZOL-9-YL)- 4,6-DICIANOBENZENE IN CHEMICAL TRANSFORMATIONS. Ruthenium and iridium polypyridine complexes are among the most employed photocatalysts described in literature. The broad applicability is due to the redox potentials and long half-life times of the excited state which these molecules presented. The pursuit for metal-free alternatives has been intensified in the last few years, therefore, many organic fluorophores were successfully employed as photocatalysts. Among them, 1,2,3,5-tetrakis(carbazol-9-yl)- 4,6-dicianobenzene (4CzIPN) recently drawn attention of the community, and it’s been widely employed by distinguished research groups. Recent studies have shown that this catalyst do not only present similar properties to transition metal complexes, but also, its synthesis can be accomplished more easily and less expensive when compared with the metallic photocatalysts above mentioned. Therefore, 4CzIPN constitutes a metal-free alternative to replace transition metal complexes in conventional photochemical protocols. Moreover, it’s as a powerful ally in the development of new photochemical approaches. In this work, we aim to summarize recent applications of 4CzIPN as catalyst in the emerging field of redox photocatalysis.

Metals and metal complexes in coal

1981 ◽  
Vol 300 (1453) ◽  
pp. 51-63 ◽  
Keyword(s):  
Metal Complexes ◽  
Soxhlet Extraction ◽  
Coal Liquefaction ◽  
Coal Rank ◽  
Metallic Elements ◽  
Iron Porphyrins ◽  
Metal Compounds ◽  
Manganese Porphyrins ◽  
Metal Free ◽  
Anthracene Oil

Some of the metal compounds that occur in coal are soluble in organic solvents and are extracted in coal liquefaction processes. The material made by the extraction of coal with hydrogenated anthracene oil has been fractionated by sequential Soxhlet extraction with low-boiling solvents, and the distribution of the metallic elements in the various fractions has been determined. Extraction of Daw Mill coal (92 kg) with acidic methanol furnishes 17.8 mg of a mixture of gallium complexes of homologous porphyrins (C 27 -C 32 ). Similar metalloporphyrin concentrates are obtained from a variety of British bituminous coals, the amount detected being about 1 pg/g, but falling off as coal rank increases. Various lignites and a range of Polish coals have also been surveyed: here, iron porphyrins and (in one case) manganese porphyrins have been observed. The iron porphyrins tend to be confined to coals of lower rank : in the lignites, metal-free tetrapyrroles are also detected. The metalloporphyrins are thought to be derived from the chlorophylls and haems of the biological precursors. Indeed, it is possible that the iron porphyrins are derived directly (i.e. without demetallation-metallation) from biological and microbiological haem compounds.

scholarly journals Insights Into the Mode of Action of the Anti-Candida Activity of 1,10-Phenanthroline and its Metal Chelates

2000 ◽  
Vol 7 (4) ◽  
pp. 185-193 ◽  
Author(s):  
Malachy McCann ◽  
Majella Geraghty ◽  
Michael Devereux ◽  
Denis O'Shea ◽  
James Mason ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Candida Albicans ◽  
Metal Complexes ◽  
Mode Of Action ◽  
Metal Chelates ◽  
Phen Ligand ◽  
Chelating Ligands ◽  
Metal Free ◽  
Highly Active

Metal complexes of malonie acid (metal = Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Ag(I)) were prepared and only the Ag(I) complex inhibited the growth of Candida albicans. Malonate complexes incorporating the chelating 1,10-phenanthroline (1,10-phen) ligand showed a range of activities: good (Mn(II), Cu(II), Ag(I)); moderate (Zn(II)); poor (Co(II), Ni(II)). Metal-free 1,10-phen and Ag(CH3CO2) were also highly active. The metal-free non-chelating ligands 1,7- phenanthroline and 4,7-phenanthroline were inactive and the Cu(II), Mn(II) and Zn(II) complexs of 1,7-phen displayed only marginal activity. Whereas the Cu(II) malonate/1,10-phen complex induces significant cellular oxidative stress the Zn(II) analogue does not.

Noble-metal-free electrocatalysts toward H2O2 production

2020 ◽  
Vol 8 (44) ◽  
pp. 23123-23141
Author(s):  
Kai Dong ◽  
Ying Lei ◽  
Haitao Zhao ◽  
Jie Liang ◽  
Peng Ding ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Noble Metal ◽  
Recent Progress ◽  
Single Atom ◽  
H2o2 Production ◽  
Metal Compounds ◽  
Metal Free ◽  
Carbon Based

This review summaries recent progress of noble-metal-free electrocatalysts toward H2O2 production including carbon-based materials, metal compounds, single atom catalysts and metal complexes.

Rapid synthesis of phthalocyanine-based discotic liquid crystals by using a novel hand-made microwave-heating apparatus

2005 ◽  
Vol 09 (08) ◽  
pp. 544-553 ◽  
Author(s):  
Keisuke Ooi ◽  
Fumihiro Maeda ◽  
Kazuchika Ohta ◽  
Tokihiro Takizawa ◽  
Takehiko Matsuse
Keyword(s):  
Liquid Crystals ◽  
Organic Solvent ◽  
Metal Complexes ◽  
Microwave Heating ◽  
Microwave Method ◽  
Discotic Liquid Crystals ◽  
Template Effect ◽  
Metal Free ◽  
The Relationship ◽  
Conventional Oil

Phthalocyanine ( Pc )-based discotic liquid crystals could be prepared very rapidly by using our developed novel microwave-heating apparatus. It took only 10-20 min to synthesize these Pc metal complexes and metal-free Pc derivatives in an organic solvent (glycerin) by microwave irradiation, whereas it took 24-48 h to synthesize them by the conventional oil bath method. To our knowledge, it is the first example of metal-free Pc derivatives synthesized by microwave methods in an organic solvent. In the vast examples of Pc syntheses by conventional oil bath methods, the Pc metal complexes can be obtained in higher yields by “Template Effect” of the metal than the corresponding metal-free Pc derivatives. Therefore, we expected that the present Pc metal complexes ( C n S )8 PcCu (2) could be also prepared by microwave methods in higher yields than the metal-free Pc derivatives ( C n S )8 PcH 2 (1). Contrary to our expectation, the yields of the metal complexes ( C n S )8 PcCu (2) were lower than those of the metal-free derivatives ( C n S )8 PcH 2 (1). It is very interesting that this result by the microwave method is quite opposite to the results by conventional oil bath method. Hence, in this work we have focused our interest on the “Template Effect” in the syntheses of Pc derivatives by the microwave method in order to investigate the relationship between microwave heating and template effect. It is the first attempt in Pc syntheses by the microwave method.

Synthesis, characterization, aggregation and thermal properties of a novel polymeric metal-free phthalocyanine and its metal complexes

Polyhedron ◽  
2009 ◽  
Vol 28 (11) ◽  
pp. 2268-2276 ◽  
Author(s):  
Ahmet Bilgin ◽  
Çiğdem Yağcı ◽  
Ufuk Yıldız ◽  
Ersel Özkazanç ◽  
Erdoğan Tarcan
Keyword(s):  
Thermal Properties ◽  
Metal Complexes ◽  
Metal Free

Promotional effect of Fe on the performance of supported Cu catalyst for ambient pressure hydrogenation of furfural

RSC Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 3888-3898 ◽  
Author(s):  
Marimuthu Manikandan ◽  
Ashok Kumar Venugopal ◽  
Atul S. Nagpure ◽  
Satyanarayana Chilukuri ◽  
Thirumalaiswamy Raja
Keyword(s):  
Selective Hydrogenation ◽  
Furfuryl Alcohol ◽  
Bimetallic Catalyst ◽  
Ambient Pressure ◽  
Catalyst System ◽  
Vapour Phase ◽  
Impregnation Method ◽  
Metal Free ◽  
Promotional Effect ◽  
Cu Catalyst

A noble-metal free FeCu based bimetallic catalyst system prepared by facile co-impregnation method was found to be a highly admirable for vapour phase selective hydrogenation of furfural to furfuryl alcohol at ambient pressure.

Nickel complexation and photophysics of alkylanthracenyl dioxocyclam macrocycle derivatives

2000 ◽  
Vol 53 (8) ◽  
pp. 651 ◽  
Author(s):  
Simon Boyd ◽  
Nuno M. Cabral ◽  
Kenneth P. Ghiggino ◽  
Martin J. Grannas ◽  
W. David McFadyen ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Fluorescence Spectra ◽  
Quantum Yields ◽  
Dihedral Angles ◽  
Electronic Interaction ◽  
Absorption And Fluorescence Spectra ◽  
X Ray ◽  
Metal Free ◽  
Fluorescence Quantum Yields ◽  
The Mean

Ligands H2L in which (10-R-anthracen-9-yl)methyl moieties (R = H, Me, Et) are covalently joined (6-position) to the 5,7-dioxocyclam macrocycle framework have been prepared and their nickel(II) complexes isolated and characterized. X-Ray crystal structures of NiIIL (R = H, Me) complexes show that in both structures the anthracene moieties are folded around towards the mean plane of the macrocycles; dihedral angles between the mean anthracene and macrocyclic planes of c. 22˚ are subtended. 1H n.m.r. spectrometry indicates that the folded conformations are retained in solution. Absorption and fluorescence spectra, fluorescence quantum yields and lifetimes of the anthracenyl macrocycles are reported. Absorption spectra of the metal complexes are red-shifted and the fluorescence is dramatically quenched compared to the metal-free compounds indicating a strong electronic interaction between the anthracene and the complexed dioxocyclam macrocycle.

The Shadow Widths of Very Small Particles are Formed Independently of the Metal Cap Build Up on the Particle

1981 ◽  
Vol 39 ◽  
pp. 568-569
Author(s):  
George C. Ruben
Keyword(s):  
Gold Particle ◽  
Film Surface ◽  
Small Particles ◽  
Geometric Process ◽  
Metal Free ◽  
Shadow Area

The formation of shadows behind small particles has been thought to be a geometric process (GP) where the metal cap build up on the particle creates a shadow width the same size as or larger than the particle. This GP cannot explain why gold particle shadow widths are generally larger than the gold particle and may have no appreciable metal cap build up (fig. 1). Ruben and Telford have suggested that particle shadow widths are formed by the width dependent deflection of shadow metal (SM) lateral to and infront of the particle. The trajectory of the deflected SM is determined by the incoming shadow angle (45°). Since there can be up to 1.4 times (at 45°) more SM directly striking the particle than the film surface, a ridge of metal nuclei lateral to and infront of the particle can be formed. This ridge in turn can prevent some SM from directly landing in the metal free shadow area. However, the SM that does land in the shadow area (not blocked by the particle or its ridge) does not stick and apparently surface migrates into the SM film behind the particle.

Sign in / Sign up

Export Citation Format

Share Document