State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
Chemistry. 2009 Nov 9;15(44):11890-7. doi: 10.1002/chem.200901707.
A multifunctional pillared-layer porous coordination polymer, {[Mn(2)(Bpybc)(ox)(2)]8 H(2)O}(n), has been constructed based on a flexible viologen derivative, 1,1'-bis(4-carboxybenzyl)-4,4'-bipyridinium dichloride (H(2)BpybcCl(2)), and an oxalate (ox) coligand. Single-crystal X-ray analysis reveals that the compound possesses multichannels with dimensions of about 6.1x6.6 A along the [110] and [-110] directions and 4.2x7.6 A along [100], and a void space of about 41.4 %. Hydrogen adsorption measurements at 77 K and 1 atm indicate that the compound exhibits a hydrogen uptake of 0.71 wt %. Owing to the incorporation of bipyridinium acceptor units, the compound can selectively accommodate aromatic donors into its nanosized pores based on charge-transfer interactions in an elastic way, and afford a specific color to different guests. Furthermore, the effect of perturbation exerted by the guest molecules on its magnetic properties has been investigated. The results indicate that the donor inclusion has little effect on its antiferromagnetic behavior, whereas dehydration of the compound decreases the strength of the magnetic exchange couplings and results in a change of the antiferromagnetic transition temperature from 14.7 to 9.8 K.
一种多功能的柱状层状多孔配位聚合物，[{Mn(2)(Bpybc)(ox)(2)]8 H(2)O}(n)，是基于一个灵活的二茂铁衍生物，1,1'-双(4-羧基苄基)-4,4'-联吡啶二氯化物(H(2)BpybcCl(2))和草酸盐(ox)配体构建的。单晶 X 射线分析表明，该化合物具有多通道，沿[110]和[-110]方向的尺寸约为 6.1x6.6 A，沿[100]方向的尺寸约为 4.2x7.6 A，空隙空间约为 41.4%。在 77 K 和 1 atm 下的氢气吸附测量表明，该化合物的氢气吸收量为 0.71wt%。由于引入了二茂铁受体单元，该化合物可以基于电荷转移相互作用以弹性的方式选择性地将芳香族供体容纳到其纳米孔中，并为不同的客体提供特定的颜色。此外，还研究了客体分子对其磁性性质的干扰效应。结果表明，供体的包含对其反铁磁行为几乎没有影响，而化合物的脱水会降低磁交换耦合的强度，并导致反铁磁转变温度从 14.7 K 变为 9.8 K。
