A Series of Homochiral Helical Metal–Organic Frameworks Based on Proline Derivatives
作者:Zhong-Xuan Xu、Yu-Lu Ma、Yu Xiao、Lei Zhang、Jian Zhang
DOI:10.1021/acs.cgd.5b01359
日期:2015.12.2
Eight novel three-dimensional homochiral helical metal–organic frameworks (HHMOFs), namely, [Cd3((S)-PIA)2(PPA)(H2O)2]n (1-L), [Cd3((R)-PIA)2(PPA)(H2O)2]n (1-D), [Cd4((R)-PIA)3(DPP)4(H2O)4]n (2-D), [Cd1.5((S)-PIA)(4,4′-DIB)2]n (3-L), [Cd1.5((S)-PIA)(DPEE)1.5]n (4-L), [Cd1.5((R)-PIA)(DPEE)1.5]n (4-D), [Cd1.5((S)-PIA)(DPEA)1.5]n (5-L), and [Cd1.5((S)-PIA)(DPEA)1.5]n (5-D) (H3PIA = 5-(2-carboxypyrrolidine-1-carbonyl) isophthalic acid) have been synthesized using proline-derived ligands ((S)-H3PIA and (R)-H3PIA). Crystallographic analysis indicates that all the complexes contain homochiral left- and/or right-handed helical chains, which are constructed by PIA fragments and Cd(II) ions. Meanwhile, in these complexes nitrogen heterocycle auxiliary ligands play an important role in structural diversity. Some physical characteristics, such as thermal stabilities, solid-state circular dichroism, and photoluminescent properties, are also investigated. Our results highlight an effective method to apply proline ligands to construct interesting HHMOFs.
合成了八种新型三维均手性螺旋金属有机框架(HHMOFs),即[Cd3((S)-PIA)2(PPA)(H2O)2]n (1-L)、[Cd3((R)-PIA)2(PPA)(H2O)2]n (1-D)、[Cd4((R)-PIA)3(DPP)4(H2O)4]n (2-D)、[Cd1.5((S)-PIA)(4,4′-DIB)2]n (3-L)、[Cd1.5((S)-PIA)(DPEE)1.5]n (4-L)、[Cd1.5((R)-PIA)(DPEE)1.5]n (4-D)、[Cd1.5((S)-PIA)(DPEA)1.5]n (5-L)和[Cd1.5((S)-PIA)(DPEA)1.5]n (5-D) (H3PIA = 5-(2-carboxypyrrolidine-1-carbonyl) isophthalic acid),使用了由脯氨酸衍生的配体((S)-H3PIA和(R)-H3PIA)。晶体学分析表明,所有配合物均含有由PIA片段和Cd(II)离子构成的均手性左旋和/或右旋螺旋链。同时,在这些配合物中,含氮杂环辅助配体对结构多样性起着重要作用。还研究了这些配合物的一些物理特性,如热稳定性、固态圆二色性和光致发光性。我们的结果强调了应用脯氨酸配体构建有趣的HHMOFs的有效方法。