| Abstract: | 本論文主要合成釓金屬的普魯士藍錯合物，得到四個以CN為架橋基4f-3d雙金屬錯合物及其單晶結構，
[Gd(DMF)3(o-phen)(H2O)2Fe(CN)6]2•H2O(1)
[Gd(DMF)3(bpy)(H2O)Fe(CN)6]2•2H2O(2)
[Gd(DMF)2(o-phen)(H2O)2Fe(CN)6]n•3nH2O•0.5n(DMF) (3)
[Gd(H2O)2Fe(CN)6]•2H2O (4)
其中錯合物1, 2, 3和4分別為異雙核，四核，一維及三維結構。在溫度範圍(2 - 300 K)測得這些透過CN架橋連接釓金屬與鐵(Ⅲ)錯合物的變溫磁化率，錯合物1, 2和3皆為反鐵磁性偶合作用，錯合物4在低溫下存在相轉移(phase – transition)，並在T = 6 K和16 K下測量磁化強度(M) (H = 0 - 5 T)，T = 16 K之實驗曲線符合基態總自旋量子數S = 3之理論曲線，但是T = 6 K之實驗曲線卻發現有兩個總自旋量子數，在低磁場下，符合S = 4之理論曲線，在高磁場下則符合S = 3之理論曲線。
Four novel cyano-bridged 4f-3d-metal complexes,
[Gd(DMF)3(o-phen)(H2O)2Fe(CN)6]2•H2O (1),
[Gd(DMF)3(bpy)(H2O)Fe(CN)6]2•2H2O(2),
[Gd(DMF)2(o-phen)(H2O)2Fe(CN)6]n•3nH2O•0.5n(DMF) (3),
[Gd(H2O)2Fe(CN)6]•2H2O (4),
have been prepared and X-ray structural characterization. There are found that complexes 1, 2, 3 and 4 are dinuclear, trteanuclear, 1-D nd 3-D network structures, respectively. The temperature ( 2 – 300 K ) dependence of magnetic susceptibility measurements of these Gd3+-NC-Fe3+ complexes shown that complexes 1, 2 and 3 are antiferromagnetic interactions,complexes 4 at low temperature exhibits phase-transition. The field dependence ( 0 - 5 T ) of the magnetization of 4 measured at 6 K and 16 K show saturation of the magnetization. At T = 16 K curve shown correspond to total spin of ground state ST = 3, however, at T = 6 K curve shown two total spin states, one correspond to ST = 4 at low field and the other correspond to ST = 3 at high field. |
