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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 12
BKCSDE 29(12)
December 20, 2008 

Isomerism of Strain-Free Metallamacrocycle. Dichloropalladium(II) Complex of 1,2-Bis(dimethyl-3-pyridylsilyl)ethane
Young Mee Na, Hyun Ji Kang, Jongki Hong, Ok Sang Jung*
Palladium(II) complexes, Cyclodimer, Cyclotrimer, Interconversion, Isomerism
Modulation of the ring size of strain-free metallacyclic compounds via thermal energy has been established. The reactions of (COD)PdCl2 with m-dpe ligand (COD = 1,5-cyclooctadiene; m-dpe = 1,2-bis(dimethyl-3- pyridylsilyl)ethane) in a mixture of acetone and ethanol at room temperature produce the metallacyclodimeric species, [PdCl2(m-dpe)]2. The cyclodimer, [PdCl2(m-dpe)]2, at the boiling temperature of the chloroform solution is completely converted to the cyclotrimer, [PdCl2(m-dpe)]3. In the 0-55 oC range, the cyclotrimer completely returns to the cyclodimer in solution for 24 h. Both the cyclodimer and the cyclotrimer are locked in the solution below 0 oC. The equilibria in the 0-55 oC range are dependent on temperature and concentration.
2361 - 2364
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