The present ternary complexes [Cu(ada)(phen)(H(2)O)]·2H(2)O (1), [Co(2)(ada)(2)(phen)(2)(H(2)O)(2)] (2) and [{Cu(ada)(3)(bipy)}(n)·3nH(2)O] (3) (H(2)ada=adipic acid, phen=1,10-phenanthroline and bipy=2,2'-bipyridine) obtained under varying experimental conditions were characterized by spectral, electrochemical and thermal studies. The bonding modes and the spatial arrangements of the carboxylate dianion around the metal ions have been investigated employing FTIR, EPR and X-ray crystallographic studies. Present data revealed a six coordinate distorted octahedral geometry for 2 with a=8.068, b=9.788, c=11.788Å, α=70.464, β=75.109, γ=72.063° and a five coordinate square pyramidal geometry for 3 with a=9.509, b=9.912, c=12.656Å, α=70.486, β=73.604, γ=75.162°. The superoxide dismutase (SOD) mimic activities of the complexes are in the order 1>3>2.
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http://dx.doi.org/10.1016/j.saa.2012.03.009 | DOI Listing |
Acc Chem Res
December 2024
Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States.
ConspectusThe redox reactivity of transition metal centers can be augmented by nearby redox-active inorganic or organic moieties. In some cases, these functional groups can even allow a metal center to participate in reactions that were previously inaccessible to both the metal center and the functional group by themselves. Our research groups have been synthesizing and characterizing coordination complexes with polydentate quinol-containing ligands.
View Article and Find Full Text PDFInorg Chem
December 2024
Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, Texas 76129, United States.
Superoxide dismutase enzymes are a major defense against superoxide, which is a potent reactive oxygen species. Misregulation of reactive oxygen species and subsequent neuronal damage are etiological hallmarks of neurodegenerative disease. Macrocyclic small molecules have offered inroads toward functional SOD1 mimics.
View Article and Find Full Text PDFRSC Adv
November 2024
Departamento de Química, Universidad Nacional de Colombia-Sede Bogotá Bogotá DC Colombia
Free radicals such as superoxide are reactive species that, upon accumulation, lead to oxidative stress. The superoxide dismutase (SOD) enzyme mitigates this stress by converting superoxide into hydrogen peroxide and oxygen. However, the probable lack of SOD supplementation has driven the search for alternatives, with copper complexes emerging as promising candidates.
View Article and Find Full Text PDFAntioxidants (Basel)
November 2024
Department of Biochemistry & Molecular Medicine, University of California, Davis, CA 95616, USA.
The disorder and heterogeneity of low-molecular-weight amyloid-beta oligomers (AβOs) underlie their participation in multiple modes of cellular dysfunction associated with the etiology of Alzheimer's disease (AD). The lack of specified conformational states in these species complicates efforts to select or design small molecules to targeting discrete pathogenic states. Furthermore, targeting AβOs alone may be therapeutically insufficient, as AD progresses as a multifactorial, self-amplifying cascade.
View Article and Find Full Text PDFBMC Plant Biol
November 2024
Department of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea.
Drought stress significantly retards the plant production. Melatonin is a vital hormone, signaling molecule, and bio-regulator of diverse physiological growth and development processes. Its role in boosting agronomic traits under diverse stress conditions has received considerable attention.
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