Solvent-controlled 3D lanthanide–polyoxometalate frameworks: reduction and stabilization of Ag nanocomposites and catalytic properties

Four three-dimensional lanthanide–polyoxometalate complexes, [K 4 Ln 3 (H 2 IDC) 3 (HIDC) 3 (H 2 O) 3 (SiW 12 O 40 )]· n H 2 O (Ln = La ( 1 ), n = 7 and Ce ( 2 ), n = 6; H 3 IDC = 4,5-imidazoledicarboxylic acid) and [Ln 4 (HIDC) 4 (H 2 O) 8 (SiW 12 O 40 )]·11H 2 O (Ln = La ( 3 ) and Ce ( 4 )), have...

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Bibliographic Details
Published in:CrystEngComm 2014-01, Vol.16 (23), p.5150-5158
Main Authors: Gao, Guang-Gang, Song, Chao-Yu, Zong, Xi-Ming, Chai, Dong-Feng, Liu, Hong, Zou, Yu-Long, Liu, Jian-Xun, Qiu, Yun-Feng
Format: Article
Language:English
Subjects:
Channels
Ethyl alcohol
Nanocomposites
Reduction
Silver
Three dimensional
Tuning
Two dimensional
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Summary:Four three-dimensional lanthanide–polyoxometalate complexes, [K 4 Ln 3 (H 2 IDC) 3 (HIDC) 3 (H 2 O) 3 (SiW 12 O 40 )]· n H 2 O (Ln = La ( 1 ), n = 7 and Ce ( 2 ), n = 6; H 3 IDC = 4,5-imidazoledicarboxylic acid) and [Ln 4 (HIDC) 4 (H 2 O) 8 (SiW 12 O 40 )]·11H 2 O (Ln = La ( 3 ) and Ce ( 4 )), have been synthesized by solvothermal reactions. Compounds 1 and 2 are 3D architectures that include 2D layered structures connected by K + cations, which were realized by tuning the reaction media with different ratios of water and ethanol. By comparison, in the cases of 3 and 4 , lanthanide ions coordinate to tridentate HIDC ligands forming 2D Ln–organic networks, which are further pillared by α-Keggin type [SiW 12 O 40 ] 4− polyoxoanions and thus constructing new 3D frameworks featuring 1D channels along the a and b axes. All of these complexes could induce the formation of Ag nanocomposites possessing high catalytic activity towards the reduction of 4-nitrophenol (4-NP) in the presence of NaBH 4 .
ISSN:1466-8033
1466-8033
DOI:10.1039/C4CE00403E