Synthesis and Magnetic Properties of Iron, Nickel Metal Clusters
| Autor: | Peng, Yi-Ru, 彭薏如 |
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| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 We had successfully synthesized a new organic ligand(mpmae–H),and then applied of to synthesize two new iron metal clusters,[Fe3O(mpmae)2OAc)2Cl3]2MeCN·H2O (2),[Fe8O4(mpmae)4(OAc)10](PF6)·H2Cl2·Et2O (3). Compound 2 was studied by X–ray structure, magnetic properties and high–field electron paramagnetic resonance(HFEPR).The dc magnetic susceptibilities and reduced magnetization revealed that the compound 2 had the pairwise exchange parameters to be antiferromagnetic and had molecule spin of 2.5 and zero–field splitting of –0.51 cm–1.The high–field electron paramagnetic resonance (HFEPR) studies indicated that the S=2.5,D=–0.49 cm-1,g=2.In addition, successfully reproduced the compound 3 that a octanuclear iron clusters of the references trinuclear iron as starting material. On the other hand,although not as expected to synthesis the 3d–4f tetranuclear mix–metal complexes [M2Ln2] (Ln=Dy;M=Ni,Cu)with mhaep–H2 or salahe–H2 ligand,but only got the dinuclear Compound[Cu2(mhaep–H)2Cl2](4),[Ni2(PhCO2)2(salahe–H)2(CH3OH)2](5). In addition, reaction of the known organic ligand (hmp–H),Ni(II) and alkanethiol gained the[Ni4(hmp)4(TM)2(H2O)2Cl4] (6),which was ferromagnetic in dc magnetic susceptibilities. The ac magnetic susceptibility measurements of the compound 6 did not show any out–of–hase signals,which was not a single molecule magnet.After grafting on a Au(III)surface,we could study the application of current mode value of scanning tunneling microscopy(STM). |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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