Using a flexible bis(pyrazol) ligand to construct four new Keggin-based compounds: syntheses, structures and properties

作者：Tian, Aixiang; Ni, Huaiping; Ji, Xuebin; Tian, Yan; Liu, Guocheng; Ying, Jun^*

来源：RSC Advances, 2017, 7(10): 5774-5781.

DOI：10.1039/c6ra25156k

• ORGANIC LIGAND
• IN-SITU
• POLYOXOMETALATE
• FRAMEWORKS
• TEMPLATES
• CLUSTERS

Using a flexible bis(pyrazol) ligand, four new compounds based on Keggin anions, namely [Cu(H(2)bdpm)(2)(H2O)(2)(HPW12O40)] (1), [Cu(H(2)bdpm)(2)(H2PW12O40)](2).2H(2)O (2), [Cu-2(H(2)bdpm)(3)(H2O)(2)(SiW12O40)].2H(2)O (3), and [Cu-2(H(2)bdpm)(4)(H2O) (SiW12O40)].16H(2)O (4) (H 2 bdpm = bis(3,5-dimethyl-1H-pyrazol-4-yl) methane), have been synthesized under hydrothermal conditions. Compound 1 is a zero dimension (0D) structure, showing a [Cu(H(2)bdpm)(2)](2+) mono-supporting [PW12O40](3-) anion. Compound 2 shows a 1D supramolecular chain, with bi-supporting anions lined by discrete [PW12O40](3-) anions. Compound 3 contains bi-nuclear Cu2+ cycles, which are linked by O4W to form a cycle-connecting-cycle chain. The [SiW12O40](4-) anions connect adjacent chains to construct a 2D structure. Compound 4 contains a nested cycle subunit [Cu-4(H(2)bdpm)(6)](8+), with two bi-nuclear cycles [Cu-2(H(2)bdpm)(2)](4+) linked by two H(2)bdpm ligands. The nested cycle subunits are connected by H(2)bdpm molecules to construct a 2D metal-organic layer. The Keggin anions link adjacent layers to form a 3D framework. The electrochemical and photocatalytic properties of compounds 1-4 are studied.

• 出版日期2017
• 单位渤海大学