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1.  SOD-Mimic Cu(II) Dimeric Complexes Involving Kinetin and Its Derivative: Preparation and Characterization 
Two SOD-mimic active dimeric Cu(II) chlorido complexes of the compositions [Cu2(μ-HL1)4Cl2]Cl2 (1) and [Cu2(μ-HL2)2(μ-Cl)2(HL2)2Cl2] · 4H2O (2) involving the cosmetologically relevant cytokinin kinetin (N6-furfuryladenine, HL1) and its derivative N6-(5-methylfurfuryl)adenine (HL2) have been synthesized and characterized by elemental analysis, infrared, and electronic spectroscopy, ESI+ mass spectrometry, conductivity and temperature dependence of magnetic susceptibility measurements, and thermogravimetric (TG) and differential thermal (DTA) analyses. The results of these methods, particularly the temperature dependence of magnetic susceptibility, showed the complexes to be dimeric with a strong antiferromagnetic exchange (J = −290 cm−1 for complex 1 and J = −160 cm−1 for 2). The complexes have been identified as auspicious SOD-mimics, as their antiradical activity evaluated by the in vitro SOD-mimic assay resulted in the IC50 values equal to 8.13 μM (1) and 0.71 μM (2).
PMCID: PMC3433123  PMID: 22966218
2.  A Pyrazolate-Supported Fe3(μ3-O)-Core; Structural, Spectroscopic, Electrochemical and Magnetic Study 
Inorganic chemistry  2007;46(26):10981-10989.
A comparison is made between the structural, spectroscopic and magnetic properties of pyrazolate versus carboxylate complexes containing the Fe3(μ3-O)-motif.
PMCID: PMC2597296  PMID: 18044951
3.  Synthesis, Characterization and Study of Octanuclear Iron-Oxo Clusters Containing a Redox-Active Fe4O4-Cubane Core 
Inorganic chemistry  2007;47(2):645-655.
A one pot synthetic procedure yields the octanuclear FeIII-complexes Fe8(μ4-O)4(μ-pz*)12X4, where X = Cl and pz* = pyrazolate anion (pz = C3H3N2-) (1), 4-Cl-pz (2) and 4-Me-pz (3), or X = Br and pz* = pz (4). The crystal structures of complexes 1 – 4, determined by X-ray diffraction, show an Fe4O4-cubane core encapsulated in a shell composed of four interwoven Fe(μ-pz*)3X-units. Complexes 1 – 4 have been characterized by 1H-nmr, infrared and Raman spectroscopy. Mössbauer spectroscopic analysis distinguishes the cubane and outer FeIII-centers by their different isomer shift and quadrupole splitting values. Electrochemical analyses by cyclic voltammetry show four consecutive, closely spaced, reversible reduction processes for each one of the four complexes. Magnetic susceptibility studies, corroborated by Density Functional Theory calculations, reveal weak antiferromagnetic coupling among the four cubane Fe-centers and strong antiferromagnetic coupling between cubane and outer Fe-atoms of 1. The structural similarity between the antiferromagnetic Fe8(μ4-O)4-core of 1 – 4 and the also antiferromagnetic units contained in the minerals ferrihydrite and maghemite is demonstrated by X-ray and Mössbauer data.
PMCID: PMC2535771  PMID: 18078337

Results 1-3 (3)