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4. Core Cross-Linked Micelle-Based Nanoreactors for Efficient Photocatalysis
作者:min zheng , zhigang xie
关键字:Photocatalysis
论文来源:期刊
发表时间:2013年
Stable nanoscale cross-linked
polymer micelles containing Ru com-plexes (Ru-CMs) were prepared from
monomethoxy[poly(ethylene glycol)]-block-poly( l -lysine) (MPEG-PLys) and
[(bpy)
2
Ru(fmbpy)] (PF
6
)
2
(bpy = bipyri-dine, fmbpy= 5-formy-5’ -methyl-2,2 ’ -bi-pyridine). To stabilize the micelles, bi-functional glutaraldehyde was used as
a cross-linker to react with the free
amino groups of the PLys block. After
that, the Ru-CMs showed very good
stability in common solvents. The Ru-CMs showed photocatalytic activity
and selectivity in the oxidation of sul-fides that were as high as those of the
well-known [Ru(bpy)
3
(PF
6
)
2
] complex,
because the micelles were swollen in
the methanol–sulfide mixture. More-over, because of the nanoscale size of
the particles and their high stability,
the Ru-CM photocatalysts can be read-ily recovered by ultrafiltration and
reused without loss of photocatalytic
activity. This work highlights the poten-tial of using cross-linked micelles as
a platform for developing highly effi-cient heterogeneous photocatalysts for
a number of important organic trans-formations.