A Multifunctional MnII Phosphonate for Rapid Separation of Methyl Orange and Electron-Transfer Photochromism

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• 作者：Chao-Ying Gao ; Dr. Yang Yang ; Jing Ai ; Hong-Rui Tian ; Dr. Lei-Jiao Li ; Dr. Weiting Yang ; Dr. Song Dang and Prof. Zhong-Ming Sun
• 刊名：Chemistry - A European Journal
• 出版年：2016
• 出版时间：August 8, 2016
• 年：2016
• 卷：22
• 期：33
• 页码：11652-11659
• 全文大小：2804K
• ISSN：1521-3765

文摘

A Mn^II phosphonate of the general formula [Mn(H₂L)₂(H₂O)₂(H₂bibp)] adopts a layered motif with protonated H₂bibp²⁺ cations embedded in the channels (H₄L=thiophene-2-phosphonic acid; bibp=4,4′-bis(1-imidazolyl)biphenyl). The title compound exhibits excellent adsorptive removal of methyl orange (MO) dye from aqueous solution. Its advantageous features include fast adsorption, high uptake capacity, selective removal, and reusability, which are of great significance for practical application in wastewater treatment. Meanwhile, the compound displays rapid photochromism upon irradiation with visible light at room temperature. Extensive research has demonstrated that such behavior is based on a ligand-to-ligand charge-transfer (LLCT) mechanism. The irradiated sample possesses an ultra-long-lived charge-separated state. Moreover, not only is the compound the first Mn-based photochromic MOF, but it is also one of the very few examples showing LLCT with non-photochromic components.