Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: September 2007
Authors: K.K. Andjelković, D.M. Sladić, Tamara R. Todorović, D.A. Jeremić, Nenad R. Filipović, Irena T. Novaković
Andjelković2,f
1
Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11081 Zemun, Serbia
2Faculty of Chemistry, University of Belgrade, P.O.
Box 158, 11001 Belgrade, Serbia 3 Institute of Chemistry, Technology and Metallurgy, Njegoševa 12, 11000 Belgrade, Serbia a nenadf@agrifaculty.bg.ac.yu, btamarat@chem.bg.ac.yu, cdsladic@chem.bg.ac.yu, d irenan@chem.bg.ac.yu, edjeremic@chem.bg.ac.yu, fkka@chem.bg.ac.yu Keywords: 2-Acetylpyridine derivatives, 2-Quinolinecarboxaldehyde derivatives, d-Metal complexes, Biological activity.
Elemental analysis (C, H, N) was performed by the standard micromethod at the Center for Instrumental Analysis of the Faculty of Chemistry, University of Belgrade, using an ELEMENTARVario ELIII C.H.N.S=O analyzer.
No structure-activity correlations could be established.
The results justify further study of biological effects of the complexes, especially bearing in mind that their structure has some analogies with cisplatin.
Box 158, 11001 Belgrade, Serbia 3 Institute of Chemistry, Technology and Metallurgy, Njegoševa 12, 11000 Belgrade, Serbia a nenadf@agrifaculty.bg.ac.yu, btamarat@chem.bg.ac.yu, cdsladic@chem.bg.ac.yu, d irenan@chem.bg.ac.yu, edjeremic@chem.bg.ac.yu, fkka@chem.bg.ac.yu Keywords: 2-Acetylpyridine derivatives, 2-Quinolinecarboxaldehyde derivatives, d-Metal complexes, Biological activity.
Elemental analysis (C, H, N) was performed by the standard micromethod at the Center for Instrumental Analysis of the Faculty of Chemistry, University of Belgrade, using an ELEMENTARVario ELIII C.H.N.S=O analyzer.
No structure-activity correlations could be established.
The results justify further study of biological effects of the complexes, especially bearing in mind that their structure has some analogies with cisplatin.
Online since: December 2013
Authors: Zi Yuan Qi, Ye Fei Wang, Xiao Li Xu
The surfactant molecule adsorption results to surface aggregation which is similar to the bi-layer structure with the increase of concentration, so the contact angle becomes slightly larger with concentration increase [15-16].
Bi-layer structure of CTAB is formed only in high surfactant concentration which changes the wettability of quartz surface to more water-wet[17-18].
Oilfield Chemistry, 2009, 26(3): 312-315(In Chinese)
International Symposium on Oilfield Chemistry, USA, 1997
SPE International Symposium on Oilfield Chemistry, 2005: 1-11
Bi-layer structure of CTAB is formed only in high surfactant concentration which changes the wettability of quartz surface to more water-wet[17-18].
Oilfield Chemistry, 2009, 26(3): 312-315(In Chinese)
International Symposium on Oilfield Chemistry, USA, 1997
SPE International Symposium on Oilfield Chemistry, 2005: 1-11
Online since: August 2013
Authors: Bao Hua Zhu, Rui Jia, Qi Feng, Hai Yan Xu, Wen Bao Li
Synthesis, Characterization and Properties of Arylamine-Acetylene Bridged Tetrahedral Cobalt and Iron Carbonyl Clusters
Rui Jia1 , Haiyan Xu1, Qi Feng1, Wenbao Li1, Baohua Zhu1,a,*
1 Chemistry and Chemical Engineering College, Inner Mongolia University, Hohhot, 010021, China
a bhzhu@imu.edu.cn
Key words: Cobalt and Iron, Carbonyl Clusters, Arylamine-Acetylene, Properties.
Introduction Transition metal carbonyl clusters have been attracting significant attention due to their potential application in areas including biological chemistry, catalysis, nanotechnology and molecular devices derived from their unusual structures, bonding modes of metal atoms, special physical and chemical properties [1-4].
In recent years, bimetallic and multi-metallic cluster complexes bridged by unsaturated hydrocarbons are attracting considerable interest resulting from the relevance to the chemistry of metal-catalyst surfaces and the potential application as polymeric materials [5, 6].
The 1H-NMR spectra of clusters 1-4 are consistent with the arylamine-alkyne bridged tetrahedron structure and show the presence of hydrogen atoms in their corresponding organic groups.
Introduction Transition metal carbonyl clusters have been attracting significant attention due to their potential application in areas including biological chemistry, catalysis, nanotechnology and molecular devices derived from their unusual structures, bonding modes of metal atoms, special physical and chemical properties [1-4].
In recent years, bimetallic and multi-metallic cluster complexes bridged by unsaturated hydrocarbons are attracting considerable interest resulting from the relevance to the chemistry of metal-catalyst surfaces and the potential application as polymeric materials [5, 6].
The 1H-NMR spectra of clusters 1-4 are consistent with the arylamine-alkyne bridged tetrahedron structure and show the presence of hydrogen atoms in their corresponding organic groups.
Online since: August 2021
Authors: Rustam L. Safiullin, Fanil F. Musin, Rida Gallyamova
Musin1,c
1Ufa Chemistry Institute of RAS, Ufa, Russia
arida_gallyamova@mail.ru, bdirector@anrb.ru, cf-musin@ya.ru
Keywords: carbon fiber, sol-gel, coating, viscosity, concentration, TiO2.
This includes the structure at the molecular level, the rate and kinetics of hydrolysis and condensation reactions, the composition of the sol components, as well as the thickness, viscosity of the solution and the method of coating [1-4].
Mal'chik, Physicochemical study of the formation of SiO2 powders and films from film-forming solutions, J. of Applied Chemistry. 69 (1996) 224-227
Novoselova, Features of film formation of hydrolysis products of tetraethoxysilane, J. of Applied Chemistry. 8 (1982) 1867-1869
Alekseenko, Formation of thin-film multicomponent structures by the sol-gel method, Vestnik GSTU. 4 (2003) 24-35
This includes the structure at the molecular level, the rate and kinetics of hydrolysis and condensation reactions, the composition of the sol components, as well as the thickness, viscosity of the solution and the method of coating [1-4].
Mal'chik, Physicochemical study of the formation of SiO2 powders and films from film-forming solutions, J. of Applied Chemistry. 69 (1996) 224-227
Novoselova, Features of film formation of hydrolysis products of tetraethoxysilane, J. of Applied Chemistry. 8 (1982) 1867-1869
Alekseenko, Formation of thin-film multicomponent structures by the sol-gel method, Vestnik GSTU. 4 (2003) 24-35
Online since: June 2015
Authors: Daniel Thomazini, André Silva Chaves, Maria Virginia Gelfuso, Olívia de Andrade Raponi
Thus, doping the crystal structure increases the concentration of carriers such as La+3 and Nd+3 [15].
The purpose of this procedure is to compare the effect of the synthesis methods in the structure and microstructure of the ceramic powders.
The precursors SrCO3 (97% - Vetec Chemistry), TiO2 (99,8% - Vetec Chemistry), La2O3 (99.9% - Sigma-Aldrich) and Nd2O3 (99.9% - Sigma-Aldrich) were mixed in stoichiometric proportions to form SrTiO3 (STO), Sr0.96La0.04TiO3 (STO-04La), Sr0.96Nd0.04TiO3 (STO-04Nd) e Sr0.96La0.02Nd0.02TiO3 (STO-02La02Nd).
The precursors SrCO3 (97% - Vetec Chemistry), Ti(C4H9O)4 (97% - Sigma-Aldrich), La2O3 (99,9% - Sigma-Aldrich) e Nd2O3 (99,9% - Sigma-Aldrich) were dissolved in aqueous solution of HNO3 (6 M) in the stoichiometric ratio to obtain STO, STO-04La, STO-04Nd and STO-02La02Nd.
The purpose of this procedure is to compare the effect of the synthesis methods in the structure and microstructure of the ceramic powders.
The precursors SrCO3 (97% - Vetec Chemistry), TiO2 (99,8% - Vetec Chemistry), La2O3 (99.9% - Sigma-Aldrich) and Nd2O3 (99.9% - Sigma-Aldrich) were mixed in stoichiometric proportions to form SrTiO3 (STO), Sr0.96La0.04TiO3 (STO-04La), Sr0.96Nd0.04TiO3 (STO-04Nd) e Sr0.96La0.02Nd0.02TiO3 (STO-02La02Nd).
The precursors SrCO3 (97% - Vetec Chemistry), Ti(C4H9O)4 (97% - Sigma-Aldrich), La2O3 (99,9% - Sigma-Aldrich) e Nd2O3 (99,9% - Sigma-Aldrich) were dissolved in aqueous solution of HNO3 (6 M) in the stoichiometric ratio to obtain STO, STO-04La, STO-04Nd and STO-02La02Nd.
Online since: November 2011
Authors: Jun Hui Li, Zhi Rong Zhu, Jing Zhang, Jun He
Shape-Selective Alkylation of Toluene with Propylene over Modified Zeolite
Jun He1, a, Jing Zhang1,b, Junhui Li1,c, Zhirong Zhu1,d
1Department of Chemistry, 1239.
Demand for molecular sieve is stricter along with application of catalyst from petrochemical to fine chemicals and environment chemistry [1,2,3,4,5,6].
Demand for pore structure and surface acidity is different between various catalytic system.
Results and Discussion Under the reaction conditions in our experiments, the toluene conversions over all catalysts were in the range of 3–50%, and therefore it was not possible to easily distinguish the role of structure of the catalyst and concentration of acid sites on their catalytic properties.
Stadelhofer: Industrial Aromatic Chemistry, Springer, Berlin, 1988, 488 pp
Demand for molecular sieve is stricter along with application of catalyst from petrochemical to fine chemicals and environment chemistry [1,2,3,4,5,6].
Demand for pore structure and surface acidity is different between various catalytic system.
Results and Discussion Under the reaction conditions in our experiments, the toluene conversions over all catalysts were in the range of 3–50%, and therefore it was not possible to easily distinguish the role of structure of the catalyst and concentration of acid sites on their catalytic properties.
Stadelhofer: Industrial Aromatic Chemistry, Springer, Berlin, 1988, 488 pp
Online since: February 2014
Authors: Hao Xu, Da Zhen Tang, Qi Tuan Yan, Shu Ying Wang, Rui Xu, Sheng Wu, Zhen Xing Liu
Table 1 Physical property of arsenic compounds in natural gas
Component
Formula
M.W. g/m
M.P.Celsius
B.P.Celsius
Arsine
AsH3
77.95
-116.3
-62.4
Methylarsine
CH3AsH2
91.97
-143.0
2.0
Dimethylarsine
(CH3)2AsH
106.00
-136.1
36.0
Trimethylarsine
(CH3)3As
120.03
-87.3
52.0
Ethylarsine
C2H5AsH2
106.00
—
36.0
Diethylarsine
(C2H5)2AsH
134.05
—
105.0
Triethylarsine
(C2H5)3As
162.11
—
138.6
Dimethylethylarsine
(CH3)2AsC2H5
134.00
—
85.6
Arsenide molecular structure of natural gas was found having the form of R3As (R represents alkane), which had a close relationship to do with outermost electron structure 4s24p3 of arsenic.
International Journal of Environmental Analytical Chemistry, 1994, 57(4):313-328
Applied Organometallic Chemistry, 1991, 5(2): 117-124
American Journal of Analytical Chemistry, 2011, 02(01): 27-45.
International Journal of Environmental Analytical Chemistry, 1994, 57(4):313-328
Applied Organometallic Chemistry, 1991, 5(2): 117-124
American Journal of Analytical Chemistry, 2011, 02(01): 27-45.
Online since: September 2013
Authors: Supanit Porntheeraphat, Jameekorn Jadto, Apiluck Eiad-Ua, Sirapat Pratontep
Anodic aluminium oxide (AAO) has interest due to its highly orders porous structures, considerable stability and cost effectiveness.
Wen-Cheng, Kinetics of electroplating process of nano-sized ceramic particle/Ni composite, Materials Chemistry and Physics. 78 (2003) 574–580
Abdel-Hamid, Materials Science Communication Improving the throwing power of nickel electroplating baths, Materials Chemistry and Physics. 53 (1998) 235-238
Chupakhina, Structure and Properties of Anodic Aluminum Oxide Films Produced in HNO3 Solutions, Inorganic Materials. 39 (2003) 50–56
Carroll, Controllable fabrication of porous alumina templates for nanostructures synthesis, Materials Chemistry and Physics. 122 (2010) 295–300
Wen-Cheng, Kinetics of electroplating process of nano-sized ceramic particle/Ni composite, Materials Chemistry and Physics. 78 (2003) 574–580
Abdel-Hamid, Materials Science Communication Improving the throwing power of nickel electroplating baths, Materials Chemistry and Physics. 53 (1998) 235-238
Chupakhina, Structure and Properties of Anodic Aluminum Oxide Films Produced in HNO3 Solutions, Inorganic Materials. 39 (2003) 50–56
Carroll, Controllable fabrication of porous alumina templates for nanostructures synthesis, Materials Chemistry and Physics. 122 (2010) 295–300
Online since: April 2018
Authors: Martina Kaszonyiová, František Rybnikář, Milena Kubišová
Here we study the effect of the external static electrical field on the iPB-1 structure and phase II →I transformation rate.
Une Nouvelle Classe de Polymeres d′α-Olefines ayant une Régularité de Structure Exceptionnelle.
Journal of Polymer Science Part A: Polymer Chemistry. 1996, 34(3), 321-332.
Influence of Crystal Polymorphism on the Three-Phase Structure and on the Thermal Properties of Isotactic Poly(1-butene).
The effect of some physical factors on the phase structure of isotatic polybutene-1, Materials Structure. 2015, 22(3), 21-25
Une Nouvelle Classe de Polymeres d′α-Olefines ayant une Régularité de Structure Exceptionnelle.
Journal of Polymer Science Part A: Polymer Chemistry. 1996, 34(3), 321-332.
Influence of Crystal Polymorphism on the Three-Phase Structure and on the Thermal Properties of Isotactic Poly(1-butene).
The effect of some physical factors on the phase structure of isotatic polybutene-1, Materials Structure. 2015, 22(3), 21-25
Online since: August 2011
Authors: Yun Hui Xu, Li Chen
Characterization on Aggregating Structure of Aloe Extract Crosslinked Cotton Fabric
Yunhui Xu1, a, Li Chen1, b
1College of Light-Textile Engineering and Art, Anhui Agricultural University, Hefei, 230036, China
axuyunhui@ahau.edu.cn, bchenli@ahau.edu.cn
Keywords: Aloe extract; Cotton cellulose; Polycarboxylic acid; Aggregating structure
Abstract.
The results obtained are useful in explaining structure-property correlations with respect to the aggregating structure and crystallinity, and suggest valuable information in planning applications for the aloe extract modified cotton textile products.
Accordingly, it is vital important to study the aggregating structure of cotton fabric treated with aloe anthraquinone.
Measurements of structures and properties.
References [1] X.F Zhang, H.M Wang, Y.L Song, L.H Nie, et al: Bioorganic & Medicinal Chemistry Letters Vol. 16 (2006), p. 949 [2] M.A.
The results obtained are useful in explaining structure-property correlations with respect to the aggregating structure and crystallinity, and suggest valuable information in planning applications for the aloe extract modified cotton textile products.
Accordingly, it is vital important to study the aggregating structure of cotton fabric treated with aloe anthraquinone.
Measurements of structures and properties.
References [1] X.F Zhang, H.M Wang, Y.L Song, L.H Nie, et al: Bioorganic & Medicinal Chemistry Letters Vol. 16 (2006), p. 949 [2] M.A.