合成了两例具有局域D4d对称性的单核钆配合物:Gd(THD)3L(THD=2,2,6,6-四甲基庚烷-3,5-二酮,L=Phen(1,10-菲罗琳,1),Bpy(2,2’-联吡啶,2).磁性研究表明其在低温下具有较大的磁热效应,在2.5 K时,0到5 T外磁场下的磁熵变(-ΔSm)分别高达17.0和18.4 J?kg-1?K-1.研究发现,化合物1,2还同时具有明显的场依赖磁弛豫性质.通过分析弛豫时间随外加磁场和温度变化的关系,发现其低场下的弛豫行为可以用共振声子俘获机制来解释,高场下的弛豫行为则可能来源于直接过程. Two mononuclear gadolinium complexes with local D4d symmetry were synthesized: Gd (THD) 3L (THD = 2,2,6,6-tetramethylheptane-3,5-dione, L = Phen 1,10-phenanthroline, 1), Bpy (2,2’-bipyridyl, 2). Magnetic studies show that it has a large magnetocaloric effect at low temperatures and at a magnetic field of 0 to 5 T at 2.5 K The magnetic entropy change (-ΔSm) is as high as 17.0 and 18.4 J? Kg-1? K-1, respectively. It is found that the compounds 1 and 2 have obvious field-dependent magnetic relaxation properties at the same time. It is found that the relaxation behavior under low field can be explained by the resonance phonon capture mechanism and the relaxation behavior under high field may be derived from the direct process.