scholarly journals NMR, ESR, NQR and IR Studies of Paramagnetic Macrocyclic Complexes of first Transition Series Metal Ions Exhibiting MLCT Phenomenon (A DFT Application) Part: II. Bis (1, 10-Phenanthroline) Complexes

2017 ◽  
Vol 33 (04) ◽  
pp. 1714-1725
Author(s):  
M. L. Sehgal ◽  
Irshad Ahmad
Keyword(s):  
Metal Ions ◽  
Macrocyclic Complexes ◽  
Ir Studies ◽  
Transition Series

Metal complexes in soils.

1955 ◽  
Vol 6 (5) ◽  
pp. 685 ◽  
Author(s):  
RS Beckwith
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Periodic Table ◽  
Organic Soils ◽  
Titration Curves ◽  
Transition Series ◽  
Presence And Absence

The release of manganese from organic soils by copper has been studied. The results obtained together with the titration curves of acid-washed organic soils, determined in the presence and absence of various added metal ions, support the suggestion of Bremner et al. (1946) that the metals of the first transition series of the periodic table are held in organic soils as complexes. The consequences of the results are discussed particularly in regard to the release of metal ions from soils and their uptake by plants.

scholarly journals Biological and Electrochemical Studies of Macrocyclic Complexes of Iron and Cobalt

2020 ◽  
Vol 11 (1) ◽  
pp. 7393-7399
Keyword(s):  
Metal Ions ◽  
Analytical Techniques ◽  
Antimicrobial Activities ◽  
Macrocyclic Complexes ◽  
Oxidation States ◽  
Electron Transfer Rate ◽  
Standard Drug ◽  
E Coli ◽  
Heterogeneous Electron Transfer ◽  
Electron Transfer Rate Constant

In this work, we synthesized two tetraaza [N4] macrocyclic complexes of FeIII and CoII metal ions. The synthesized macrocyclic complexes were fully characterized by using various analytical techniques IR, UV-Vis, and MS. The spectral analysis indicated an octahedral geometry for both macrocyclic complexes. The electrochemical behavior was carried out using cyclic voltammetry on the Pt dish (0.031 cm2) electrode. The complexes were shown to have unusual oxidation states for the metal ions. The “heterogeneous electron transfer rate constant” (Ko) was also calculated using “Nicholson and Kochi’s method” and observed in the order: KoCoII > KoFeIII. The antimicrobial activities of two complexes were computed against E. coli, P. aeruginosa, B. cereus, S. aureus, whereas antifungal activities against C. Albicans and were contrasted with the standard drug “Gentamycin”.

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