Discrete Sandwich Compounds of Monolayer Palladium Sheets
Tetsuro Murahashi,1*
Mayu Fujimoto,1
Masa-aki Oka,1
Yasuhiro Hashimoto,1
Tomohito Uemura,1
Yasuki Tatsumi,1
Yoshihide Nakao,2
Atsushi Ikeda,2
Shigeyoshi Sakaki,2
Hideo Kurosawa1*
Despite the abundance of "sandwich" complexes, in which two
cyclic aromatic hydrocarbon ligands flank a metal center, this
motif has not been extended to sheets of multiple metal atoms.
We prepared and isolated two such compounds. In the first, three
palladium centers form a planar triangular array, capped by
chlorides, between two cycloheptatrienyl ligands. In the second,
a pentapalladium sheet adopts an edge-sharing triangle-trapezoid
skeleton between two naphthacene rings. The compounds were characterized
by x-ray crystallography and nuclear magnetic resonance spectroscopy.
The nature of bonding in the clusters was analyzed by quantum
calculations.
2 Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
* To whom correspondence should be addressed. E-mail: tetsu{at}chem.eng.osaka-u.ac.jp (T.M.); kurosawa{at}chem.eng.osaka-u.ac.jp (H.K.)
