...
首页> 外文期刊>Crystal growth & design >A case study of ZnII-bmb meso-helical coordination polymers upon the spacer angles and lengths of dicarboxylate coligands
【24h】

A case study of ZnII-bmb meso-helical coordination polymers upon the spacer angles and lengths of dicarboxylate coligands

机译:ZnII-bmb中螺旋配位聚合物对二羧酸大分子配位基的间隔角和长度的影响

获取原文
获取原文并翻译 | 示例
           

摘要

To systematically explore the influence of the spacer angles and lengths of dicarboxylate coligands on building Zn~(II)-bmb [1,4-bis(2- methylbenzimidazol-1-ylmethyl)benzene] meso-helical coordination polymers, we synthesized seven metal-organic frameworks {[Zn(bmb)_(0.5)(o-bdc)(H _2O)·0.5 (bmb)·H_2O}_n (1), {[Zn(bmb)(2,6-pydc)]·2H_2O}_n (2), [Zn (bmb)(m-bdc)]_n (3), [Zn(bmb)_(0.5)(p-bdc)·H _2O]_n (4), [Zn (bmb)(fum)]_n (5), {[Zn(bmb)(suc)] · 1.5H_2O}_n (6), and {[Zn(bmb)(glu)]·H _2O}_n (7) (o-H_2bdc = 1,2-benzenedicarboxylic acid, 2,6-H_2pydc = 2,6-pyridinedicarboxylic acid, m-H_2bdc = 1,3-benzenedicarboxylic acid, p-H_2bdc = 1,4-benzenedicarboxylic acid, H_2fum = fumaric acid, H_2suc = succinic acid, and H_2glu = glutaric acid) through rationally varying the organic acid linkers. Structural analyses reveal that complexes 1-7 display diverse helical characters under the influence of dicarboxylates with different spacers. In complexes 1, 2, 3, and 7, the bmb ligands adopt transconformation bridging Zn~(II) ions to form rare meso-helices, which are further extended and decorated by different dicarboxylate coligands. Complex 4 exhibits a fascinating Borromean topology with three parallelly interlocked 6-hcb networks, in which p-bdc~(2-) and bmb with trans-conformation are linked by Zn~(II) ions to form a charming meso-helical chain. Complex 5 displays a 3-fold interpenetrated 3D diamonded network containing Zn~(II)/bmb/fum left-and right-handed helical microchannels. Complex 6 features unusual interweaved meso-helices constructed by cis-and trans-conformational bmb, which is the second example of tetra-flexural helix with four spiral shafts in one helical chain. In addition, the suc~(2-) anions further link ZnII-bmb meso-helices to form a 3D framework. T hese results indicate that the spacers of dicarboxylate coligands and the conformations of bmb have important effects on the meso-helical characters and ultimate frameworks. Moreover, the investigation of photoluminescence properties of 1-7 reveals that the helical feature plays an important role in reducing photoluminescent intensities.
机译:为了系统地研究二羧酸大分子配体的间隔角和长度对构建Zn〜(II)-bmb [1,4-双(2-甲基苯并咪唑-1-基甲基)苯]中螺旋配位聚合物的影响,我们合成了七种金属有机框架{[Zn(bmb)_(0.5)(o-bdc)(H _2O)·0.5(bmb)·H_2O} _n(1),{[Zn(bmb)(2,6-pydc)]· 2H_2O} _n(2),[Zn(bmb)(m-bdc)] _ n(3),[Zn(bmb)_(0.5)(p-bdc)·H _2O] _n(4),[Zn(bmb) )(烟)] _ n(5),{[Zn(bmb)(suc)]·1.5H_2O} _n(6)和{[Zn(bmb)(glu)]·H _2O} _n(7)(o -H_2bdc = 1,2-苯二甲酸,2,6-H_2pydc = 2,6-吡啶二甲酸,m-H_2bdc = 1,3-苯二甲酸,p-H_2bdc = 1,4-苯二甲酸,H_2fum =富马酸, H_2suc =琥珀酸,H_2glu =戊二酸)通过合理地改变有机酸连接子来实现。结构分析表明,配合物1-7在带有不同间隔基的二羧酸盐的影响下显示出多种螺旋特征。在配合物1、2、3和7中,bmb配体采用跨构架桥式连接Zn〜(II)离子,形成稀有的介观螺旋,并进一步被不同的二羧酸大分子配体扩展和修饰。配合物4表现出具有三个平行互锁的6-hcb网络的引人入胜的Borromean拓扑结构,其中具有反式构象的p-bdc〜(2-)和bmb通过Zn〜(II)离子连接形成一条迷人的介螺旋链。配合物5显示3倍互穿的3D菱形网络,其中包含Zn〜(II)/ bmb / fum左手和右手螺旋微通道。复合体6具有由顺式和反式构象bmb构成的异常交织的介观螺旋,这是在一个螺旋链中具有四个螺旋轴的四挠性螺旋的第二个示例。此外,suc〜(2-)阴离子还连接ZnII-bmb介观螺旋,形成3D骨架。这些结果表明,二羧酸大分子配体的间隔物和bmb的构象对介螺旋特性和最终构架具有重要影响。此外,对1-7的光致发光性质的研究表明,螺旋特征在降低光致发光强度中起重要作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号