New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560064 (India).
Angew Chem Int Ed Engl. 2014 Oct 27;53(44):11772-7. doi: 10.1002/anie.201405619. Epub 2014 Sep 11.
Flexible and dynamic porous coordination polymers (PCPs) with well-defined nanospaces composed of chromophoric organic linkers provide a scaffold for encapsulation of versatile guest molecules through noncovalent interactions. PCPs thus provide a potential platform for molecular recognition. Herein, we report a flexible 3D supramolecular framework {[Zn(ndc)(o-phen)]⋅DMF}n (o-phen = 1,10-phenanthroline, ndc = 2,6-napthalenedicarboxylate) with confined nanospaces that can accommodate different electron-donating aromatic amine guests with selective turn-on emission signaling. This system serves as a molecular recognition platform through an emission-readout process. Such unprecedented tunable emission with different amines is attributed to its emissive charge-transfer (CT) complexation with o-phen linkers. In certain cases this CT emission is further amplified by energy transfer from the chromophoric linker unit ndc, as evidenced by single-crystal X-ray structural characterization.
具有明确纳米空间的灵活和动态的多孔配位聚合物 (PCPs) 由发色有机连接体组成，为通过非共价相互作用封装各种客体分子提供了支架。PCPs 因此为分子识别提供了一个潜在的平台。在此，我们报道了一种柔性的 3D 超分子框架 {[Zn(ndc)(o-phen)]⋅DMF}n (o-phen = 1,10-菲咯啉，ndc = 2,6-萘二甲酸酯)，具有受限的纳米空间，可以容纳具有选择性开启发射信号的不同供电子芳族胺客体。该系统通过发射读取过程作为分子识别平台。这种前所未有的具有不同胺的可调发射归因于其与 o-phen 连接体的发射电荷转移 (CT) 络合。在某些情况下，这种 CT 发射通过来自发色体单元 ndc 的能量转移进一步放大，这一点通过单晶 X 射线结构表征得到证实。
