Synthesis of polymeric and low molecular weight phthalocyanines from nitriles and metal carbonyls on SiO2 and TiO2 and catalytic activities in the sulfide oxidation

2001 ◽  
Vol 05 (04) ◽  
pp. 381-389 ◽  
Author(s):  
D. WÖHRLE ◽  
O. N. SUVOROVA ◽  
N. TROMBACH ◽  
E. A. SCHUPAK ◽  
R. GERDES ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Titanium Dioxide ◽  
Ir Spectra ◽  
Metal Complexes ◽  
Sulfide Oxidation ◽  
Low Molecular Weight ◽  
Metal Carbonyls ◽  
Test Reaction ◽  
Catalytic Activities ◽  
Photocatalytic Activities

A new method for coatings of polymeric phthalocyanines and for comparison also of low molecular weight phthalocyanine metal complexes ( W , Cr , Mo , Co ) on quartz and titanium dioxide was developed by the reaction of metal carbonyls adsorbed on the carriers with tetracarbonitriles or phthalonitrile. By UV-vis or IR spectra the formation of structural uniform polymeric phthalocyanines on the carriers is established. The compounds are used then to compare their catalytic and photocatalytic activities in the oxidation of sulfide as test reaction.

Characterization of Erionites with A Supported Metallic Phase by TEM, IR,AEM and Auger Methods

1987 ◽  
Vol 111 ◽  
Author(s):  
D. R. Acosta ◽  
J. Salmones ◽  
J. Navarrete ◽  
G. Juarez
Keyword(s):  
Molecular Weight ◽  
Metallic Phase ◽  
Low Molecular Weight ◽  
Important Process ◽  
Test Reaction ◽  
Acid Properties ◽  
Catalytic Isomerization ◽  
Low Weight ◽  
Dual Action

Catalytic isomerization of paraffines of low molecular weight is a very important process in petrochemical refination and zeolites like mordenites and erionites are used frequently as supports, due to acid properties, neccesary for a dual action in hydroisomerization processes(1–3). In the present work, we analyze the behavior of erionites interchanged with Pt at low weight concentrations, using test reaction for n-pentane hydrodesintegration. At several stages of the process, small quantities of the samples were studied using TEM,AEM, IR, ESCA and Auger methods.

Weak alkali and alkaline earth metal complexes of low molecular weight ligands in aqueous solution

2008 ◽  
Vol 252 (10-11) ◽  
pp. 1093-1107 ◽  
Author(s):  
Pier G. Daniele ◽  
Claudia Foti ◽  
Antonio Gianguzza ◽  
Enrico Prenesti ◽  
Silvio Sammartano
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Metal Complexes ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Low Molecular Weight

Luminescent aryl–group eleven metal complexes

2017 ◽  
Vol 46 (7) ◽  
pp. 2046-2067 ◽  
Author(s):  
José M. López-de-Luzuriaga ◽  
Miguel Monge ◽  
M. Elena Olmos
Keyword(s):  
Molecular Weight ◽  
Liquid Crystals ◽  
Metal Complexes ◽  
Low Molecular Weight ◽  
Aryl Group ◽  
Recent Developments ◽  
Low Molecular Weight Gelators

This perspective highlights the recent developments in the study of the photoluminescent properties of aryl–group eleven complexes. Related properties and applications such as electroluminescence, triboluminescence, mechanochromism, luminescent liquid crystals, low molecular weight gelators and photocatalysts are also discussed.

scholarly journals Induced chirality of cage metal complexes switched by their supramolecular and covalent binding

2018 ◽  
Vol 47 (4) ◽  
pp. 1036-1052 ◽  
Author(s):  
Vladyslava B. Kovalska ◽  
Serhii V. Vakarov ◽  
Marina V. Kuperman ◽  
Mykhaylo Y. Losytskyy ◽  
Elzbieta Gumienna-Kontecka ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Metal Complexes ◽  
Covalent Binding ◽  
Covalent Bonding ◽  
Supramolecular Interactions ◽  
Low Molecular Weight

An ability of the ribbed-functionalized iron(ii) clathrochelates to induce a CD output in their supramolecular interactions with a protein or covalent bonding with a low-molecular-weight chiral inductor, was discovered.

scholarly journals Preparation and Characterization of Low-Molecular-Weight Natural Rubber Latex via Photodegradation Catalyzed by Nano TiO2

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1216 ◽  
Author(s):  
Suhawati Ibrahim ◽  
Nadras Othman ◽  
Srimala Sreekantan ◽  
Kim Tan ◽  
Zairossani Mohd Nor ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Titanium Dioxide ◽  
Natural Rubber ◽  
Chemical Structure ◽  
Sol Gel ◽  
Natural Rubber Latex ◽  
Low Molecular Weight ◽  
Rubber Latex ◽  
Liquid Natural Rubber ◽  
New Applications

Natural rubber is one of the most important renewable biopolymers used in many applications due to its special properties that cannot be easily mimicked by synthetic polymers. To sustain the existence of natural rubber in industries, modifications have been made to its chemical structure from time to time in order to obtain new properties and to enable it to be employed in new applications. The chemical structure of natural rubber can be modified by exposure to ultraviolet light to reduce its molecular weight. Under controlled conditions, the natural rubber chains will be broken by photodegradation to yield low-molecular-weight natural rubber. The aim of this work was to obtain what is known as liquid natural rubber via photodegradation, with titanium dioxide nanocrystals as the catalyst. Titanium dioxide, which was firstly synthesized using the sol–gel method, was confirmed to be in the form of an anatase, with a size of about 10 nm. In this work, the photodegradation was carried out in latex state and yielded low-molecular-weight natural rubber latex of less than 10,000 g/mol. The presence of hydroxyl and carbonyl groups on the liquid natural rubber (LNR) chains was observed, resulting from the breaking of the chains. Scanning electron microscopy of the NR latex particles showed that titanium dioxide nanocrystals were embedded on the latex surface, but then detached during the degradation reaction.

Reaktionen von Metallcarbonylen mit Poly-1-vinyl-2-pyrrolidinon / Metal Complexes with Polymeric Ligands, XI Reactions of Metal Carbonyls with Poly-1-vinyl-2-pyrrolidinone

1975 ◽  
Vol 30 (3-4) ◽  
pp. 226-228 ◽  
Author(s):  
Hans-G. Biedermann ◽  
Wolfgang Graf
Keyword(s):  
Ir Spectra ◽  
Metal Complexes ◽  
Methylene Chloride ◽  
Metal Carbonyls ◽  
Polymeric Ligands

Poly-1-vinyl-2-pyrrolidinone with Mn2(CO)10, Fe(CO)5, Co2(CO)8 and Ni(CO)4 in methylene chloride forms the following complexes: [Mn(C6H9NO)5]n, Fe(C6H9NO)5]n, [[Co(C6H9NO)5] [Co(CO)4]2]n and [Ni(C6H9NO)4]n. The IR spectra are discussed.

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