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

2004 ◽  
Vol 23 (3) ◽  
pp. 222-229 ◽  
Author(s):  
Serap Kavlak ◽  
Alp Osman Kodolbaş ◽  
Hatice Kaplan Can ◽  
Ali Güner ◽  
Zakir M. O. Rzaev
Keyword(s):  
Electrical Conductivity ◽  
Transition Metal ◽  
Maleic Anhydride ◽  
Acrylic Acid ◽  
Metal Complexes ◽  
Temperature Dependence ◽  
Transition Metal Complexes

Intramolecular reorientation, an electron spin relaxation process in solutions of discrete paramagnetic transition-metal complexes

1978 ◽  
Vol 31 (11) ◽  
pp. 2355 ◽  
Author(s):  
DM Doddrell ◽  
DT Pegg ◽  
MR Bendall ◽  
AK Gregson
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Temperature Dependence ◽  
Transition Metal Complexes ◽  
Spin Relaxation ◽  
Electron Spin ◽  
Potential Energy Profile ◽  
Methyl Proton ◽  
Electron Spin Relaxation ◽  
Time Modulation

Time modulation of the g-tensor by intramolecular reorientation between structurally equivalent molecular arrangements is postulated to dominate electron spin relaxation in solutions of some paramagnetic transition-metal complexes. The process is treated theoretically and it is shown that the resulting electron spin relaxation time depends on the correlation time for intramolecular reorientation. The temperature dependence of the nuclear T1 thus yields information concerning the potential energy profile for intramolecular reorientation. Experimental results on the field dependence of the temperature dependence of T1 of the methyl proton in Ru(acac)3 are in accord with the theory.

Temperature-electrical conductivity relations for 5-nitro- and 6-nitrobenzimidazole and their transition metal complexes

1990 ◽  
Vol 159 ◽  
pp. 215-223 ◽  
Author(s):  
Mamdouh S. Masoud ◽  
Gamal B. Mohamed ◽  
Mohamed K. Kassem ◽  
Ali El-Dessouky ◽  
Ahmed M. Hindawy ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes

Luminescence and photochemistry of transition metal complexes. I. Studies of temperature dependence of tervalent chromium complexes with oxygen-, nitrogen-, and carbon-coordinated ligands

1971 ◽  
Vol 24 (9) ◽  
pp. 1807 ◽  
Author(s):  
JL Laver ◽  
PW Smith
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Temperature Dependence ◽  
Transition Metal Complexes ◽  
Energy Interval ◽  
Experimental Investigations ◽  
Chromium Complexes ◽  
Radiative Processes

Experimental investigations of the luminescence exhibited by a range of tervalent chromium complexes are reported. The effects of the coordinated ligand on the temperature dependence of phosphorescence are examined and rationalized in terms of the 4T2-2E energy interval. In the case of hexaureachromium complexes which emit both phosphorescence and fluorescence the varying emission intensities observed for compounds with a variety of anions are interpreted in terms of competition between the non-radiative thermal repopulation process 2E ~~→ 4T2 and the radiative processes 2E → 4A2, 4T2 → 4A2.

Transition metal complexes of thiabendazole

1971 ◽  
Vol 24 (7) ◽  
pp. 1369 ◽  
Author(s):  
C Kowala ◽  
KS Murray ◽  
JM Swan ◽  
BO West
Keyword(s):  
Electrical Conductivity ◽  
Transition Metal ◽  
Transition Metals ◽  
Metal Complexes ◽  
Organic Solvents ◽  
Transition Metal Complexes ◽  
Metal Ion ◽  
Magnetic Moments ◽  
Anthelmintic Activity ◽  
Metal Chlorides

Complexes of thiabendazole with transition metals (Co2+, Cu2+, Fe2+, Fe3+, Mn2+, Ni2+, and Zn2+) containing one, two, or three molecules of ligand per metal ion are described. Their spectra and magnetic moments are reported. In general, the complexes are insoluble or only slightly soluble in water or most organic solvents. Only complexes of metal chlorides are sufficiently soluble in methanol to show electrical conductivity. It is suggested that most of the insoluble complexes are of polymeric character. � The anthelmintic activity of all complexes is only slightly higher than that of thiabendazole.

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