双功能
金属有机骨架
化学
微型多孔材料
吸附
氢键
选择性
配体(生物化学)
结晶学
水溶液
选择性吸附
无机化学
物理化学
立体化学
分子
有机化学
催化作用
受体
生物化学
作者
Sandeep Singh Dhankhar,Nayuesh Sharma,Sandeep Kumar,T. J. Dhilip Kumar,C. M. Nagaraja
标识
DOI:10.1002/chem.201703384
摘要
Abstract A bifunctional, microporous Zn II metal–organic framework, [Zn 2 (NH 2 BDC) 2 (dpNDI)] n (MOF 1 ) (where, NH 2 BDC=2‐aminoterephthalic acid, dpNDI= N , N ′‐di(4‐pyridyl)‐1,4,5,8‐naphthalenediimide) has been synthesized solvothermally. MOF 1 shows an interesting two‐fold interpenetrated, 3D pillar‐layered framework structure composed of two types of 1D channels with dimensions of approximately 2.99×3.58 Å and 4.58×5.38 Å decorated with pendent −NH 2 groups. Owing to the presence of a basic functionalized pore surface, MOF 1 exhibits selective adsorption of CO 2 with high value of heat of adsorption ( Q st =46.5 kJ mol −1 ) which is further supported by theoretically calculated binding energy of 48.4 kJ mol −1 . Interestingly, the value of Q st observed for MOF 1 is about 10 kJ mol −1 higher than that of analogues MOF with the benzene‐1,4‐dicarboxylic acid (BDC) ligand, which establishes the critical role of the −NH 2 group for CO 2 capture. Moreover, MOF 1 exhibits highly selective and sensitive sensing of the nitroaromatic compound (NAC), 2,4,6‐trinitrophenol (TNP) over other competing NACs through a luminescence quenching mechanism. The observed selectivity for TNP over other nitrophenols has been correlated to stronger hydrogen bonding interaction of TNP with the basic −NH 2 group of MOF 1 , which is revealed from DFT calculations. To the best of our knowledge, MOF 1 is the first example of an interpenetrated Zn II ‐MOF exhibiting selective adsorption of CO 2 as well as efficient aqueous‐phase sensing of TNP; investigated through combined experimental and theoretical studies.
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