In:
Chemistry – An Asian Journal, Wiley, Vol. 11, No. 6 ( 2016-03-18), p. 858-867
Abstract:
Three hybrid coordination networks that were constructed from ɛ‐Keggin polyoxometalate building units and imidazole‐based bridging ligands were prepared under hydrothermal conditions, that is, H[(Hbimb) 2 (bimb){Zn 4 PMo V8 Mo VI 4 O 40 }] ⋅ 6 H 2 O ( 1 ), [Zn(Hbimbp)(bimbp) 3 {Zn 4 PMo V8 Mo VI 4 O 40 }] ⋅ DMF ⋅ 3.5 H 2 O ( 2 ), and H[Zn 2 (timb) 2 (bimba) 2 Cl 2 {Zn 4 PMo V8 Mo VI 4 O 40 }] ⋅ 7 H 2 O ( 3 ) (bimb=1,4‐bis(1‐imidazolyl)benzene, bimbp=4,4′‐bis(imidazolyl)biphenyl, timb=1,3,5‐tris(1‐imidazolyl)benzene, bimba=3,5‐bis(1‐imidazolyl)benzenamine). All three compounds were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, and single‐crystal X‐ray diffraction. The mixed valence of the Mo centers was analyzed by XPS spectroscopy and bond‐valence sum calculations. In all three compounds, the ɛ‐Keggin polyoxometalate (POM) units acted as nodes that were connected by rigid imidazole‐based bridging ligands to form hybrid coordination networks. In compound 1 , 1D zigzag chains extended to form a 3D supramolecular architecture through intermolecular hydrogen‐bonding interactions. Compound 2 consisted of 2D curved sheets, whilst compound 3 contained chiral 2D networks. Because of the intrinsic reducing properties of ɛ‐Keggin POM species, noble‐metal nanoparticles were loaded onto these POM‐based coordination networks. Thus, compounds 1 – 3 were successfully loaded with Ag nanoparticles, and the corresponding composite materials exhibited high catalytic activities for the reduction of 4‐nitrophenol.
Type of Medium:
Online Resource
ISSN:
1861-4728
,
1861-471X
DOI:
10.1002/asia.201501332
Language:
English
Publisher:
Wiley
Publication Date:
2016
detail.hit.zdb_id:
2233006-9
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