DC electrical conductivity of poly[4-amino-2,6-pyrimidinodithiocarbamate] and its metal complexes

El‐Shekeil, Ali; Al-Maydama, Hussein M.A.; Al-Karbooly, Ashour; Khalid, Maarib A

doi:10.1016/s0032-3861(98)00477-7

Cited by 32 publications

(14 citation statements)

References 10 publications

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“…This adsorbed water effect study (El-Shekeil et al 1999) concludes that the water attaches itself to specific but nonequivalent points on the polymer chain. This attachment causes the localization of the N and/or S electron pairs and the creation of quantum quasi-particles; solitons and polarons.…”

Section: Introductionmentioning

confidence: 72%

“…In our previous studies (El-Shekeil et al 1997;El-Shekeil et al 1998 andEl-Shekeil et al 1999) a comparative study from the point of view of the DC electrical conductivity and its change with temperature variation (300-500 K) was illustrated for the polymer-metal complexes under investigation in the present work. As a result the activation energies worked out for different temperature segments were explained.…”

Section: Introductionmentioning

confidence: 74%

“…The details of the synthesis, physical measurements, characterization and identification as well as the DC electrical conductivity of the three conducting polymer complexes of interest (PPT-Fe, PPT-Co and PPT-Ni) and their structure, shown in structure 1, can be found in previous publications (El-Shekeil et al 1997;El-Shekeil et al 1998 andEl-Shekeil et al 1999).…”

Section: Synthesis Of Polymer Complexes and Physical Analysismentioning

confidence: 99%

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Behaviour of Thermal Degradation of Some Poly (4-amino-2,6-pyrimidinodithiocarbonate) Metal Complexes

Al-Maydama

El‐Shekeil

Al-Karbouly

2008

SQU Journal for Science

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‫ﺍﻟﺤﺭﺍﺭﻱ‬ ‫ﺍﻟﺘﺤﻠل‬ ‫ﺴﻠﻭﻙ‬ ‫ﺍﻟﻤﻌﺎﺩﻥ‬ ‫ﻤﻌﻘﺩﺍﺕ‬ ‫ﻟﺒﻌﺽ‬ ABSTRACT:The thermal decomposition behaviour of the Fe(II), Co(II) and Ni(II) complexes of poly[4-amino-2,6-pyrimidinodithiocarbamate] has been investigated by thermogravimetric analysis (TGA) at a heating rate of 10°C min -1 under nitrogen. The Coats-Redfern integral method is used to evaluate the kinetic parameters for the successive steps in the decomposition sequence observed in the TGA curves. The processes of thermal decomposition taking place in the three complexes are studied comparatively as the TGA and DTA curves indicate the difference in the thermal decomposition behaviour. The thermal stabilities for the release of the fragments at the successive steps in the sequential decomposition of these complexes are discussed in terms of electronegativity and ionic size effects. The difference in thermal stability and the inconsistent variation in the kinetic parameters of these complexes are considered.

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 74%

Section: Synthesis Of Polymer Complexes and Physical Analysismentioning

confidence: 99%

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Behaviour of Thermal Degradation of Some Poly (4-amino-2,6-pyrimidinodithiocarbonate) Metal Complexes

Al-Maydama

El‐Shekeil

Al-Karbouly

2008

SQU Journal for Science

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“…Particular attention is paid to the response of protein to the increase in temperature, therefore important are techniques providing studies on thermal transitions [2][3][4][5]. Temperature dependence of DC electric conductivity (σ) is used in studies, which are carried out on polymeric materials, polymer-metal compounds, inorganic semiconductors [6,7] and variety of biological materials [8][9][10][11][12]. Moreover, the method permits to find the glass transition temperature from the slope changes of the logarithm of electrical conductivity with reciprocal absolute temperature plots [13].…”

Section: Introductionmentioning

confidence: 99%

DC Electrical Conductivity in Studies on Solid-State Proteins

Kubisz

Hojan‐Jezierska

2010

Acta Phys. Pol. A

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In structural studies on biological materials, among other methods, electrical techniques are used widely. Temperature dependence of electrical conductivity is a method permitting studies on denaturation, glass transition and water release -processes, which occur in solid-state proteins. Variations of amplitude and temperature of the peak on the recorded thermogram make it possible to draw conclusions about thermal stability and physicochemical processes occurring in the studied biological material. The shape of experimental curve is material-related and depends upon its "history". The paper is based on experimental results obtained mainly for collagen.

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“…5 During the past few years the alteration of existing polymeric materials by means of chelation reactions with various metal ions has attracted a good deal of attention. DC electrical conductivity of polydithiooxamide-metal complexes, 6 and poly[4-amino-2,6-pyrimidinodithiocarbamate] and its metal complexes 7 have been investigated by different research groups.…”

mentioning

confidence: 99%

Temperature dependence of electrical conductivity in poly(maleic anhydride‐alt‐acrylic acid) and its transition metal complexes

et al. 2004

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Poly(maleic anhydride-alt-acrylic acid) and its transition-metal complexes with Ni(II), Cu(II), and Cd(II) were synthesized. Poly(maleic anhydride-alt-acrylic acid) was characterized using Fourier transform infrared (FTIR), titration, viscometry, differential scanning calorimetry (DSC), and POLY(MALEIC ANHYDRIDE-alt-ACRYLIC ACID) AND ITS TRANSITION METAL COMPLEXESthermogravimetric (TGA) analysis. The temperature dependence of the conductivity of the copolymer and polychelates of transition metals was investigated between 300 and 453 K. The polychelates and copolymers were also analyzed by using FTIR spectroscopy before and after transition point. The observed conductivity followed by a semiconductor behavior with increasing temperature is discussed in relation to the presence of transition-metal ions. C

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DC electrical conductivity of poly[4-amino-2,6-pyrimidinodithiocarbamate] and its metal complexes

Cited by 32 publications

References 10 publications

Behaviour of Thermal Degradation of Some Poly (4-amino-2,6-pyrimidinodithiocarbonate) Metal Complexes

Behaviour of Thermal Degradation of Some Poly (4-amino-2,6-pyrimidinodithiocarbonate) Metal Complexes

DC Electrical Conductivity in Studies on Solid-State Proteins

Temperature dependence of electrical conductivity in poly(maleic anhydride‐alt‐acrylic acid) and its transition metal complexes

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