Synthesis, Structures And Magnetic Properties Of Transition Metal Complexes Based On N, O And S Atom Ligands

Single molecule magnets (SMMs) have been of intense interest due to their potential applications in high-density information storage, quantum computation as well as spintronics. More recently, SMMs based on first-row transition metal ions have attracted increasing attention, especially for the low-coordinate metal species. Up to date, the coordination constituents based on first-row transition metal ions are mostly derived from N and O atoms. The main goal of this study is focus on the synthesis, structure and magnetic properties of mononuclear and dinuclear complexes containing nitrogen, oxygen and sulfur atoms. Our results are as followed:1. Compounds 1-4 belonging to isomorphic structural, both compound 5 and compound 1 are enantiomers. Furthermore, we studied the reaction mechanism refering to the formatiuon of compound 1.2. The chiral characterization of compound 1 was determined by vibrational circular dichroism (VCD) spectra. The infrared spectrometer (IR) measurement absolutely confirms the reliability and chiral characteristic of compound 1.The thermal decomposition behavior of compound 1 was investigated by TGA.4. The dynamic susceptibility measurements revealed that field-induced slow magnetic relaxation behavior was observed in compound 1, which implied that quantum tunneling of the magnetization(QTM) can be effectively prevented upon application of applied magnetic field. The relaxation times and effective spin-reversal barrier of compound 1 were obtained by fitting the variable-frequency ac susceptibility data of the out-of-phase (?") to the frequency(v) curve. The ?mT value for compound 6 indicates the presence of a weak antiferromagnetic interaction between Cu2+ ions.5. Compound 4 was characterized by X-ray fluorescence spectrometer. The result exhibits the appearance of blue shifted phenomenon for compound 4 which is indicative of luminescent properties.6. By utilizing thiocarboxylic acid ligands and anhydrous ferric chloride in anhydrous anaerobic conditions leading to the formation of compound 7, single crystal X-ray single crystal diffraction studies reveal that compound 7 is a dinuclear neutral cluster. Compound 8 was directly obtained by solution method with the ammonium salt (APDTC) ligand, and X-ray single crystal diffraction studies show that compound 8 belongs to mononuclear complex based on cobalt atom.