Magnetic Studies of Twisting Geometry in Trinuclear Manganese Clusters

• Main Authors: Kai-Hung Cheng, 鄭凱鴻
• Other Authors: Hui-Lien Tsai
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/82448806873024099082

碩士 === 國立成功大學 === 化學系碩博士班 === 97 === This work contains three parts. The first part, the complexes [Mn3O(R-salox)3(L)3(ClO4)](R = H, L = 2,4’-bipy (1) ; R = Me, L = 2,4’-bipy (2) ; R = Et, L = 2,4’-bipy (3) ; R = Me, L = phpy (4) ; R = Et, L = phpy (5) ; R = Ph, L = phpy (6)) are synthesized from the reactions of H2salox and its derivatives with MnⅡ ions. The structures of these complexes are determined by X-ray crystallography. Direct current (DC) and alternating current (AC) magnetic studies indicate the complexes 2, 3, 4, 5 and 6 are single-molecule magnets (SMM) with an S = 6 ground spin state, in contrast complex 1 has the ground spin state S = 0. The second part, the reaction of H2salox and its derivatives with MnⅡ ions in MeOH yields the trinuclear complexes of [Mn3O(R-salox)3(MeOH)3(ClO4)] (R = Me (7) ; R = Et (8) ; R = Ph (9)). The structures of these complexes are determined by X-ray crystallography. DC and AC magnetic studies evidence that complexes 7, 8 and 9 are single-molecule magnets (SMM) with an S = 6 ground spin state. The third part, treatment of bipyridine-containing linkers (dpe, azpy or bpe) with MnⅡ ions produce two-dimensional coordination polymers, [Mn3O(salox)3(L)1.5(ClO4)] (L = dpe (10) ; L = azpy (11) ; L = bpe (12)). The structures of these complexes are determined by X-ray crystallography. The DC magnetic studies indicate that they have an S = 0 ground spin state.