多金属氧酸盐
乙二胺四乙酸
螯合作用
蚀刻(微加工)
质子
金属
化学
水溶液中的金属离子
无机化学
选择性
离子
纳米技术
材料科学
有机化学
催化作用
图层(电子)
物理
量子力学
作者
Zhong Zhang,Peng Tao,Hong‐Rui Tian,Yue Qian,Shumei Liu,Yiwei Liu,Xiaohui Li,Ying Lü,Zhen‐Gang Sun,Elfi Kraka
标识
DOI:10.1021/acs.chemmater.0c00440
摘要
A chelation-assisted selective etching (CASE) strategy is developed to construct a hierarchical polyoxometalate-based metal–organic framework (POM@MOF). The selected chelator, ethylenediaminetetraacetic dianion (EdtaH22–), can bind protons of the acid etchant to provide a low initial proton concentration. The dwindling protons are more controllable when localized at specific positions (e.g., polar crystal facets) of POM@MOF to initiate selective etching. Subsequently, with the liberated metal ions being chelated, the bound protons are gradually released in situ. The secondary release of protons results in a local high proton concentration (i.e., enrichment effect), thereby further enhancing the etch selectivity. When the amount of EdtaH22– is controlled, POM@MOFs with different morphologies and pore structures are fabricated by selective etching. The on-demand storage and release of protons overcomes the traditional uncontrollability caused by direct proton addition. The CASE strategy provides a feasible way to design diverse hierarchical MOFs because of the universal chelation between EdtaH22– and metal ions.
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