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Assembly, Loading, and Alignment of an Analytical Ultracentrifuge Sample Cell
Published on: November 5, 2009
Face and edge directed self-assembly of Pd12 tetrahedral nano-cages and their self-sorting
Prodip Howlader1, Partha Sarathi Mukherjee1
1Inorganic and Physical Chemistry Department , Indian Institute of Science , Bangalore-560012 , India . Email: psm@ipc.iisc.ernet.in ; ; Tel: +91-80-22933352.
Abstract:
Reactions of a cis-blocked Pd(ii) 90° acceptor [cis-(tmeda)Pd(NO3)2] (M) with 1,4-di(1H-tetrazol-5-yl)benzene (H ) and [1,3,5-tri(1H-tetrazol-5-yl)benzene] (H ) in 1 : 1 and 3 : 2 molar ratios respectively, yielded soft metallogels G1 and G2 [tmeda = N,N,N',N'-tetramethylethane-1,2-diamine]. Post-metalation of the gels G1 and G2 with M yielded highly water-soluble edge and face directed self-assembled Pd12 tetrahedral nano-cages T1 and T2, respectively. Such facile conversion of Pd(ii) gels to discrete tetrahedral metallocages is unprecedented. Moreover, distinct self-sorting of these two tetrahedral cages of similar sizes was observed in the self-assembly of M with a mixture of H and H in aqueous medium. The edge directed tetrahedral cage (T1) was successfully used to perform Michael reactions of a series of water insoluble nitro-olefins assisted by encapsulation into the cage in aqueous medium.
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