Pd(II) and Pt(II) complexes with amphiphilic ligands: formation of micelles and [5]rotaxanes with alpha-cyclodextrin in aqueous solution

Chemistry, an Asian Journal
Toshiaki TairaKohtaro Osakada

Abstract

[3]Pseudorotaxanes [1(alpha-CD)(2)][X] (X=Cl, NO(3)), prepared from reaction of an N-alkylbipyridinium [4,4'-bpy-N-(CH(2))(10)OC(6)H(3)-3,5-(OMe)(2)][X] ([1][X]) and alpha-CD, react with M(NO(3))(2)(en) (M=Pd, Pt; en=1,2-ethylenediamine) in a 2:1 molar ratio to afford [5]rotaxanes [M{(4,4'-bpy-N-(CH(2))(10)OC(6)H(3)-3,5-(OMe)(2))(alpha-CD)(2)}(2) (en)][NO(3)](4) ([2(alpha-CD)(4)][NO(3)](4), M=Pd; [3(alpha-CD)(4)][NO(3)](4), M=Pt). A similar reaction of [1][Cl] with [M(NO(3))(2)(en)] (M=Pd, Pt) produces amphiphilic Pd and Pt complexes, [2][NO(3)](4) and [3][NO(3)](4). Complexes [2][NO(3)](4) and [3][NO(3)](4) form micelles in the presence of small amounts of dyes (Nile red and pyrene) in water. The critical micelle concentration (CMC) was determined by the absorption peak of the dye, which is encapsulated in the micelles in solution. Micelle formation is confirmed by dynamic light scattering measurement of the solution and TEM (transmission electron microscopy) images of the micelles deposited from the solution. Addition of alpha-CD to the aqueous solution containing these amphiphilic complexes results in degradation of the micelle structure and the formation of [5]rotaxanes, [2(alpha-CD)(4)][NO(3)](4) and [3(alpha-CD)(4)][NO(3)...Continue Reading

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Feb 3, 2007·Organic Letters·Yuji SuzakiKohtaro Osakada
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Citations

Dec 9, 2009·Journal of the American Chemical Society·Stephen M GoldupAlexandra M Z Slawin
Jul 24, 2018·Chemistry : a European Journal·Youssef AtoiniLuisa De Cola
Sep 4, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·Yuji SuzakiMasaki Horie
Nov 12, 2009·Chemical Communications : Chem Comm·Toshiaki TairaKohtaro Osakada
Feb 4, 2012·Chemical Communications : Chem Comm·Liangliang ZhuYanli Zhao
Apr 21, 2011·Organic & Biomolecular Chemistry·Liangliang ZhuHe Tian
Oct 22, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Yuji SuzakiKohtaro Osakada
Dec 3, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yuji SuzakiKohtaro Osakada

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