Synthesis, Structure, and Solvent‐Induced Spontaneous Homochiral Assembly of Bidentate Bis(N,N′‐diaryl‐N‐heterocyclic carbene)‐Palladium Complexes

A series of new bidentate bis(N‐heterocyclic carbene)‐palladium complexes 4a–e and 6 with xanthene framework was synthesized. The X‐ray analyses of the complexes revealed that the complexes have conformational chirality. Homochiral crystals of 4a and 6 were obtained by recrystallization from THF or...

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Bibliographic Details
Published in:European Journal of Inorganic Chemistry 2008-11, Vol.2008 (31), p.4861-4865
Main Authors: Makino, Takeshi, Masu, Hyuma, Katagiri, Kosuke, Yamasaki, Ryu, Azumaya, Isao, Saito, Shinichi
Format: Article
Language:English
Subjects:
Carbene ligands
Chiral resolution
Nitrogen heterocycles
Palladium
X‐ray diffraction
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Summary:A series of new bidentate bis(N‐heterocyclic carbene)‐palladium complexes 4a–e and 6 with xanthene framework was synthesized. The X‐ray analyses of the complexes revealed that the complexes have conformational chirality. Homochiral crystals of 4a and 6 were obtained by recrystallization from THF or 1,4‐dioxane as solvent. The energy barriers for racemization of the complexes were calculated from dynamic NMR spectroscopy. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) We synthesized a series of new bidentate bis(NHC)‐Pd complexes with xanthene skeleton. The complexes crystallized in twisted conformations and therefore were chiral at solid state. Homochiral crystalswere obtained when cyclic ether was used as the solvent. X‐ray analyses indicated that the interaction between the complex and the solvent contributed to formation of the homochiral crystals.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.200800831