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机构地区:[1]清华大学化学系,北京100084
出 处:《无机化学学报》2015年第9期1798-1804,共7页Chinese Journal of Inorganic Chemistry
基 金:国家重点基础研究发展计划(No.2013CB933403);国家自然科学基金(No.91222104;21771103;20121318518)资助项目
摘 要:利用柔性酚胺类配体N,N′-二甲基-N,N′-(2-羟基-4,5-二甲基苄基)乙二胺(H2L)与Cu(Ⅱ)反应,合成了2个新的酚氧桥联多核Cu(Ⅱ)配合物[Cu II3(L)2(CH3OH)2](Cl O4)2(1),[CuII3(L)2(CuICl2)2](2)。配合物1~2中,3个Cu2+之间通过2个酚氧桥连接,形成线性三核结构。两边的铜离子分别被配体L2-上的N2O2螯合配位,轴向与甲醇分子的氧(配合物1)或[Cu Cl2]-的氯(配合物2)配位,形成四方锥配位构型。中间铜离子与两侧L2-上的4个酚氧原子以平面四边形配位。Cu II-O-Cu II键角为100.14°~101.79°。对配合物1~2进行变温磁化率测量表明,铜离子之间通过酚氧桥存在强的反铁磁耦合,磁耦合常数J分别为-277(9)cm-1(配合物1)和-299(3)cm-1(配合物2)(基于自旋哈密顿算符H=-2J(S1·S2+S2·S3)。J值与酚氧桥桥联键角有一定相关性,即Cu-O-Cu桥联键角越大,反铁磁耦合越强。Two polynuclear copper complexes containing the flexible ligand N,N'-dimethyl-N,N'_(2_hydroxy_4,5_ dimethylbenzyl)ethylenediamine (H2L) have been prepared and characterized structurally and magnetically. The complexes have the formula [CuⅡ3(L)2(CH3OH)2](ClO4)2(1) and [CuⅡ3(L)2(Cu1Cl2)2](2). X-ray single-crystal structure analyses show that both complexes contain linear CuⅡ-CuⅡ-CuⅡ cores where adjacent Cu (Ⅱ) ions are doubly bridged by phenolate groups of L2-. The coordination sphere of the terminal Cu(Ⅱ) ions is square pyramidal with the methanol oxygen (complex 1) or the chloride ion of [CuCl2]- (complex 2) situated at the apical position, whereas the central Cu(Ⅱ) has a square coordination environment. The CuⅡ-O-CuⅡ bridging bond angles are in the range of 100.14°-101.79°. Magnetic studies show that both complexes exhibit strong antiferromagnetic interaction with the spin exchange coupling constants (J) of-277(9) cm-1 (1) and -299(3) cm-1 (2) (H=-2J(S1·S2+S2·S3). The antiferromagnetic interactions have been found to be mainly related to the CuⅡ-O-CuⅡ bond angles. Larger Cu-O- Cu bond angles correspond to stronger antiferromagnetic interaction (more negative J values). CCDC 1057549, 1; 1057550, 2.
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