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合成和表征了两种新的两核VO(Ⅱ)配合物[(VO)_2(TPHA)(H_2O)_2(L)_2](Ac)_2,这里TPHA表示对苯二甲酸根二价阴离子,L表示4.4′-二甲基-2,2′-联吡啶(Me_2bpy)和5-硝基-1,10-邻菲啰啉(NO_2·Phen)。基于红外光谱、元素分析以及室温磁矩等手段推定了配合物具有对苯二甲酸根桥联结构和V(Ⅲ)离子的配位环境为畸变四方锥形构型。测定了配合物[(VO)_2(TPHA)(H_2O)_2(Me_2bpy)_2](Ac)_2的变温磁化率(4.2~300K),求得交换积分J=-42.7cm~(-1),结果表明,双核VO(Ⅱ)配合物具有反铁磁自旋磁交换作用。
Two new two-core VO (Ⅱ) complexes [(VO) _2 (TPHA) (H_2O) _2 (L) _2] (Ac) _2 were synthesized and characterized. TPHA indicates terephthalic acid dianion, L represents 4,4’-dimethyl-2,2’-bipyridine (Me_2bpy) and 5-nitro-1,10-phenanthroline (NO_2 · Phen). Based on IR, elemental analysis and magnetic moment at room temperature, the coordination environment with terephthalic acid bridged structure and V (Ⅲ) ion was presumed to be distorted tetragonal conformation. The temperature-dependent magnetic susceptibility (4.2-300K) of the complex [(VO) _2 (TPHA) (H_2) _2 (Me_2bpy) _2] (Ac) _2 was determined and the exchange integral was calculated as J = -42.7cm -1, The results show that the dual-core VO (Ⅱ) complex has antiferromagnetic spin-exchange effect.