Photocatalytic Properties and Luminescent Sensing for Cr3+ Cations of Polyoxovanadates-Based Inorganic–Organic Hybrid Compounds with Multiple Lewis Basic Sites

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• 作者：Hong-Mei Zhang ; Jin Yang ; Wei-Qiu Kan ; Ying-Ying Liu ; Jian-Fang Ma
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：January 6, 2016
• 年：2016
• 卷：16
• 期：1
• 页码：265-276
• 全文大小：1145K
• ISSN：1528-7505

文摘

A new family of polyoxovanadates-based inorganic–organic hybrid compounds with multiple Lewis basic sites, namely, [Zn₅(Htrb)₂(H₂O)₂(V₅O₁₅)₂]·11H₂O (1), [Zn₂(Htrb)(HV₅O₁₅)]·6H₂O (2), [Co₃(Htrb)(H₂O)₄(V₃O₉)₂]·4H₂O (3), and [Ag₃(Htrb)(H₄V₅O₁₆)]·H₂O (4), have been hydrothermal synthesized by using a multidentate N-containing hexakis(1,2,4-triazol-ylmethy1)benzene (Htrb). In 1, [V₄O₁₂]^4– and [V₆O₁₈]^6– rings are linked by Zn(II) ions into a two-dimensional (2D) inorganic layer, which are pillared by Htrb ligands to afford a unique three-dimensional (3D) framework. In 2, rod-shaped [H₂V₁₀O₃₀]^8– clusters are bridged by Zn(II) ions to generate one-dimensional inorganic hybrid motifs, which are joined by Htrb ligands to yield a 3D framework. In 3, Co(II) ions bridge [V₆O₁₈]^6– rings to result in a 2D inorganic sheet, and the adjacent sheets are extended by the Htrb ligands into a 3D motif. In 4, adjacent 12-membered vanadium rings, composed of [VO₄] tetrahedra and [VO₅] trigonal bipyramids, form a unique 2D inorganic layer via sharing corner O atoms. Strikingly, neighboring layers are further extended by Htrb ligands and Ag(I) ions into a 3D framework. Moreover, photocatalytic degradation of compounds 1, 3, and 4 toward methylene blue (MB) and methyl orange (MO) was studied under UV light irradiation. A possible photocatalytic mechanism was also speculated by introducing t-butyl alcohol as a widely used ·OH scavenger. In addition, luminescent selective and sensitive sensing of Cr³⁺ compared with other metal ions such as Zn²⁺, Al³⁺, Co²⁺, K⁺, Na⁺, and Pb²⁺ were investigated by using 1 and 4. Finally, their electrochemical behaviors were also studied.