Synthesis and Magnetic Properties ofHeptanuclear Manganese Single Molecule Magnets

• Main Authors: Chen, Siou-Yin, 陳秀銀
• Other Authors: Yang, En-Che
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/19398637478760173302

碩士 === 輔仁大學 === 化學系 === 99 === The synthesis, X-ray structure, magnetic properties and high-field electron paramagnetic resonance (HFEPR) of a new heptanuclear manganese cluster [Mn7(heamp)6]．2(ClO4)．4CH2Cl2．H2O is reported. The Mn7 is synthesized from [Mn3O(O2CMe)6(py)3](ClO4) and heampH3 ligand. The compound is composed of one MnII as a centere which surrounding by a hexagon consisted by six MnIII. The dc magnetic susceptibilities and reduced magnetization revealed that the Mn7 has molecule spin of 19/2 and zero-field splitting of -0.16 cm-1. The ac magnetic susceptibility measurements exhibited the Mn7 has out-of-phase signals, is an single molecule magnet with the effective energy barrier of 12.9 cm-1. The high-field electron paramagnetic resonance (HFEPR) studies indicate the S = 19/2, g = 1.96, D = -0.16 cm-1. The HFEPR confirmed that the Mn7 is a new member of half-integer spin SMM.