A feasible route to approach 3D POM-based hybrids: utilizing substituted or reduced Keggin anions with high charge density.
Five new hybrid compounds based on Keggin polyanions, Ag(+)/Cu(+) ions and 1,3-bis(1,2,4-triazol-1-yl)propane (btp) molecules have been hydrothermally synthesized. In [Ag(5)(btp)(4)(H(2)O)(2)][PCuW(11)O(39)]·2H(2)O (1), [Ag(4.33)Na(0.67)(btp)(4)(H(2)O)(2)][PMnMo(11)O(39)]·H(2)O (2) and [Cu(4)(btp)(4)Na(H(2)O)(2)][PMnMo(11)O(39)]·2H(2)O (3), the neighboring mono-substituted Keggin clusters are alternately connected via sharing oxygen atoms to form an unusual Keggin-based transition-metal monosubstituted chain, in which the Keggin cluster serves as a decadentate ligand and grafts ten metal atoms representing the highest connected number for Keggin cluster and forming a 3D framework. In [Ag(5)(btp)(4)][PW(VI)(10)W(V)(2)O(40)] (4) and [Ag(5)(btp)(4)][PMo(VI)(10)Mo(V)(2)O(40)] (5), two-electron reduced Keggin clusters as hexadentate linkages are inserted in the rhomboid-like tunnels of the Ag-btp framework and connect with the framework via six Ag-O bonds to achieve 3D motifs, which are new and rare examples of heteropoly blue based hybrid compounds. The successful synthesis of the five high-dimensional structures may provide a feasible route for us to approach 3D polyoxometalate-based hybrids by using substituted Keggin anions and heteropoly blues with high charge density. Furthermore, photocatalytic experiments indicate that both 1 and 4 have good activities for photocatalytic degradation of RhB under UV irradiation. The luminescent properties of compounds 1-5 in the solid state were also investigated.
Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun 130024, PR China. chenyg146
Chun-Jing
CJ
Zhang
Hai-Jun
HJ
Pang
Qun
Q
Tang
Ya-Guang
YG
Chen
D000838:Anions / Q000737:chemistry; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry / Q000528:radiation effects; D049449:Luminescence; D019216:Metals, Heavy / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D010782:Photolysis; D033362:Powder Diffraction; D012235:Rhodamines / Q000737:chemistry / Q000528:radiation effects; D013055:Spectrophotometry, Infrared; D013818:Thermogravimetry; D017973:Tungsten Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction; D000099294:Polyoxometalates
D000838:Anions; D004396:Coloring Agents; D019216:Metals, Heavy; D012235:Rhodamines; D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates; C029773:rhodamine B