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http://dx.doi.org/10.5012/bkcs.2009.30.3.573

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)
Publication Information
Bulletin of the Korean Chemical Society / v.30, no.3, 2009 , pp. 573-576 More about this Journal
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.
Keywords
Catenane; Hydrogelation; Metallacycles; Palladium; Si ligands;
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