scholarly journals ERBIUM AND SANDWICH-TYPE LUTETIUM COMPLEXES CONTAINING FRAGMENTS OF TETRAANTHRACHINOPORPHIRAZINE AND SUBSTITUTED PHTHALOCYANINES

2021 ◽  
Vol 64 (4) ◽  
pp. 42-51
Author(s):  
Serafima A. Znoyko ◽  
Alexandra P. Elizavarova ◽  
Tatyana V. Kustova ◽  
Anastasiya N. Nakonechnaya
Keyword(s):  
Metal Complexes ◽  
Spectral Properties ◽  
Chemical Structure ◽  
Oxidative Degradation ◽  
Polymeric Materials ◽  
Thermal Oxidative Degradation ◽  
Hydrogen Atoms ◽  
Composition And Structure ◽  
Sandwich Type ◽  
Concentrated Sulfuric Acid

The present work relates to the synthesis and spectral properties of erbium and sandwich type metal complexes containing tetraanthraquinoporphyrazine as well as phthalocyanine fragments. By reacting tetraanthrachinoporphirazine erbium (lutetium) acetate with excess phthalonitrile, 4-chloro, 4-bromophthalonitrile and unsubstituted phthalonitrile, sandwich-type complexes of an unsymmetrical structure were obtained. The compounds were extracted from the reaction mixture with a suitable organic solvent (DMF or toluene) and purified by prolonged extraction of impurities with acetone in a Soxlet apparatus. Final purification was carried out by column chromatography. The obtained complexes are green solids having solubility in DMSO, DMF, and concentrated sulfuric acid. The composition and structure of complexes were confirmed by elemental analysis, IR and electron spectroscopy. Influence of chemical structure of new "sandwich" compounds on their spectral properties and possible applications has been investigated. In particular, when analyzing the electron absorption spectra, it was found that the metal, the nature of the substituents in the tetraanthraquinone moiety and the replacement of hydrogen atoms with halogen atoms in the phthalocyanine moiety slightly affect the nature and position of the absorption maxima. Studies have been carried out on the coloristic properties of synthesized organosoluble metal complexes erbium and lutetium. The compounds have been found to exhibit the properties of pigments and dyes for polymeric materials such as polystyrene and polyethylene. The temperature parameters of thermal oxidative degradation were determined and it was found that the obtained "sandwich" type phthalocyanines have high resistance to thermal oxidative degradation.

scholarly journals Electrochemically Produced Copolymers of Pyrrole and Its Derivatives: A Plentitude of Material Properties Using “Simple” Heterocyclic Co-Monomers

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 281
Author(s):  
Tomasz Jarosz ◽  
Przemyslaw Ledwon
Keyword(s):  
Biological Activity ◽  
Material Properties ◽  
Building Block ◽  
Conjugated Polymer ◽  
Chemical Structure ◽  
Heterocyclic System ◽  
Repeat Unit ◽  
Polymeric Materials ◽  
Pyrrole Derivatives ◽  
Pyrrole Monomer

Polypyrrole is a classical, well-known conjugated polymer that is produced from a simple heterocyclic system. Numerous pyrrole derivatives exhibit biological activity, and the repeat unit is a common building block present in the chemical structure of many polymeric materials, finding wide application, primarily in optoelectronics and sensing. In this work, we focus on the variety of copolymers and their material properties that can be produced electrochemically, even though all these systems are obtained from mixtures of the “simple” pyrrole monomer and its derivatives with different conjugated and non-conjugated species.

Cytokinin activity of some substituted ureas and thioureas

1966 ◽  
Vol 165 (999) ◽  
pp. 245-265 ◽  
Keyword(s):  
Biological Activity ◽  
Active Compound ◽  
Phenyl Ring ◽  
Chemical Structure ◽  
Lower Activity ◽  
Cytokinin Activity ◽  
Hydrogen Atoms ◽  
Detectable Activity ◽  
Low Activity

N , N '-Diphenylurea was shown to have reproducible cytokinin activity . Some 500 ureas, mainly of the N -monosubstituted and N , N '-disubstituted types, were tested an d about one half of these were active. Attempts were made to correlate chemical structure with biological activity. Although there are some exceptions to nearly every generalization it has been possible to formulate some principles. (1) Phenyl urea was the simplest active compound. (2) An HNCONH bridge conferred higher activity than an HNCSNH linkage and any other tested arrangement of the bridge gave inactive com pounds. (3) Compounds in which both amino hydrogen atoms on one or both sides of the bridge were substituted were of low activity or were inactive. (4) Many com pounds of the type R NHCONH 2 in which R = a substituted phenyl ring were tested. Ring substitution generally increased the activity and the highest activity was associated with meta substitution and the lowest with ortho . Compounds with electron-attracting substituents were generally more active than those with electron-donating substituents. Pyridyl compounds were active but com pounds with non-planar rings were inactive. (5) In compounds of the type R NHCONH R ' in which R and R ' were phenyl or substituted phenyl groups the highest activities were usually found in com pounds with one unsubstituted phenyl ring. Those with two substituted phenyl groups generally had lower activity. Some ureas showed detectable activity at 0.1 parts/10 6 . This was about four times less active than kinetin when tested in the tobacco pith assay.

Thermal-oxidative degradation of a styrene-butadienestyrene rubber graft copolymer

1968 ◽  
Vol 10 (11) ◽  
pp. 2870-2879 ◽  
Author(s):  
V.V. Rode ◽  
Yu.P. Novichenko ◽  
S.R. Rafikov
Keyword(s):  
Graft Copolymer ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation

Effect of alkylated diphenylamine on thermal-oxidative degradation behavior of poly-α-olefin

2015 ◽  
Vol 69 (7) ◽  
Author(s):  
Mian-Ran Chao ◽  
Wei-Min Li ◽  
Li-Li Zhu ◽  
Hai-Hong Ma ◽  
Xiao-Bo Wang
Keyword(s):  
Activation Energy ◽  
Oxidative Stability ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation ◽  
Degradation Behavior ◽  
Thermal Oxidative Stability ◽  
Zinc Dialkyl Dithiophosphate ◽  
Dialkyl Dithiophosphate

AbstractAn oil-soluble antioxidant, alkylated diphenylamine (ADPA), was prepared by alkylation of diphenylamine. The influence of ADPA on the thermal-oxidative stability of poly-α-olefin (PAO8) was evaluated by thermogravimetry (TG). For comparison, the thermal-oxidative stability of PAO8 with zinc dialkyl dithiophosphate (ZDDP) was also investigated. Activation energy (E

Thermal and thermal-oxidative degradation of polycyanates

1974 ◽  
Vol 16 (1) ◽  
pp. 15-23 ◽  
Author(s):  
V.V. Korshak ◽  
P.N. Gribkova ◽  
A.V. Dmitrenko ◽  
A.G. Puchin ◽  
V.A. Pankratov ◽  
...  
Keyword(s):  
Oxidative Degradation ◽  
Thermal Oxidative Degradation
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