Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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First Hydrogelation of Discrete Metal Complexes. Structures and Fluxional Behavior of Cyclopalladium(II) Complexes

  • Na, Young-Mee (Department of Chemistry, Pusan National University) ;
  • Noh, Tae-Hwan (Department of Chemistry, Pusan National University) ;
  • Ha, Byung-Jo (Department of Dermatic Health Management, Eulji University) ;
  • Hong, Jong-Ki (College of Pharmacy, Kyung Hee University) ;
  • Jung, Ok-Sang (Department of Chemistry, Pusan National University)
  • Published : 2009.03.20
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Abstract

The reaction of $(en)Pd(NO_3)_2$ (en = ethylenediamine) with 1,4-bis(dimethyl-4-pyridylsilyl)benzene (L) affords cyclodimer, $[(en)Pd(L)]_2(NO_3)_4$, whereas the reaction of $(tmeda)Pd(NO_3)_2$ (tmeda = N,N,N’,N’-tetramethylethylenediamine) with L gives cyclotrimer, $[(tmeda)Pd(L)]_3(NO_3)_6$. Both complexes exist as catenane in water. The catenated cyclodimer is rigid whereas the catenated cyclotrimer is dynamic in water. The catenated cyclotrimers afford hydrogel containing 98.5% water below 2 ${^{\circ}C}$. The hydrogel changes to its sol around 38 ${^{\circ}C}$, and to its clear solution at 78 ${^{\circ}C}$. Such a notable difference between $[(en)Pd(L)]_2(NO_3)_4$ and $[(tmeda)Pd(L)]_3(NO_3)_6$ might be explained by their different dynamic behavior via ring size effects.

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