Journal of Solid State Chemistry ( IF 3.3 ) Pub Date : 2017-10-27 , DOI: 10.1016/j.jssc.2017.10.035 Si-si Feng , Ling Xie , Li-ping Lu , Miao-li Zhu , Feng Su
Careful investigation of the effects of metal ions and pH value resulted in five multi-dimensional metal−organic complexes, [Co5(μ3-OH)2(α-bptc)2(H2O)6]n (1), {(H3O)2[Co4(μ3-O)(α-bptc)2(H2O)]·4H2O}n (2), {K2[Zn4(μ3-OH)2(α-bptc)2(H2O)3]}n (3), [Zn4(α-bptc)2(H2O)3]n (4), and {[Cd4(α-bptc)2(H2O)7]·2H2O}n (5) (α-H4bptc = 2,3,3',4'-biphenyl tetracarboxylic acid). The complexes consisted of different highly connected secondary building units (SBUs) assembled via hydrothermal in situ routes. The pH value as well as the kinds of metal ions influenced the coordination modes of α-H4bptc and also introduced the hydroxyl ligand at high pH value, resulting in the diversity of SBUs and dimensionality. Variable temperature magnetic measurements indicated the antiferromagnetic behavior in the Co5 core in 1, and the intra-chain ferrimagnetic behavior in complex 2. Moreover, the luminescent properties of the complexes 3−5 indicated the existence of intra-ligand charge transfer.
中文翻译:
基于不对称联苯四羧酸盐的五种金属-有机配合物的多样性:合成,结构,磁性和发光
的金属离子和pH值的影响仔细调查导致5多维金属-有机络合物,[CO 5(μ 3 -OH)2(α -bptc)2(H 2 O)6 ] Ñ(1), {(H 3 O)2 [CO 4(μ 3 -O)(α -bptc)2(H 2 O)]·4H 2 ö} ñ(2),[KP 2 [的Zn 4(μ 3 -OH)2个(α- bptc)2(H 2 O)3 ]} n(3),[Zn 4(α- bptc)2(H 2 O)3 ] n(4)和{[Cd 4(α- bptc)2(H 2 O)7 ]·2H 2 ö} ñ(5)(α - ħ 4 BPTC = 2,3,3 '4 ' -联苯四羧酸)。这些综合体由通过水热原位路线组装的不同高度连接的二级建筑单元(SBU)组成。pH值以及金属离子的种类影响了α- H 4 bptc的配位方式,并在高pH值下引入了羟基配体,导致了SBU的多样性和尺寸。变温磁性测量表明在联合的反铁磁行为5芯1,和帧内-在复杂的链铁磁行为2。另外,配合物的发光性能3 - 5指示帧内的存在-配体电荷转移。