Σύνθεση και χαρακτηρισμός μεταλλικών πλειάδων υψηλού σπιν και μονομοριακών μαγνητών

Abstract

The combination of a-benzoin-oxime (aboH2) in the coordination chemistry of NiII leadsto the formation of octanuclear clusters which contain an unusual peroxo anion derivedby the reduction of atmospheric oxygen while the reducing agent appears to be theorganic ligand (aboH2) which was found within the clusters in its oxidized form as theanion of a-benzil monooxime (abmoH). The in-depth study of the above reaction systemand the chemical reactivity of the octanuclear cages led to the synthesis of a family ofNiII clusters which counts over 20 family members built around a ι6-δ 3:δ 3-Ο2 2-. Thecombination of pseudochalides and other organic ligands in the above reaction systemdid not alter the cores of the octanuclear clusters but caused significant structuralchanges which in turn drastically changed the magnetic properties of the clusters. Theclusters were characterized by X-ray crystallography, spectroscopic and physicalmethods while their magnetic properties were also investigated.In the second part of this thesis, was completed the study of the magnetic properties ofa family of hexanuclear MnIII cages, while was also studied the coordination chemistryof other oxime ligands in combination with nickel, iron and manganese.