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Title: Syntheses and characterizations of Pd(II) complexes incorporating a N-heterocyclic carbene and aromatic N-heterocycles
Authors: Han, Y. 
Huynh, H.V. 
Tan, G.K.
Issue Date: 3-Dec-2007
Citation: Han, Y., Huynh, H.V., Tan, G.K. (2007-12-03). Syntheses and characterizations of Pd(II) complexes incorporating a N-heterocyclic carbene and aromatic N-heterocycles. Organometallics 26 (25) : 6447-6452. ScholarBank@NUS Repository.
Abstract: Reaction of the bromo-bridged dimeric monocarbene complex [PdBr 2(iPr2-bimy)]2 (1) with various bidentate N-heterocycles afforded novel linear dinuclear Pd(II) complexes {[PdBr2(iPr2-bimy)]2(μ-L)}-{μ- L = 4,4′-bipyridine (2); μ-L = 4,4′-bipyridylethane (3); μ-L = 4,4′-bipyridylethylene (4)}. The mononuclear counterpart [PdBr 2(iPr2-bimy)(pyridine)] (5) has also been synthesized by reaction of 1 with pyridine. All compounds have been fully characterized by multi-nuclei NMR spectroscopies, FAB mass spectrometry, and X-ray diffraction analyses. Molecular structures of 2-5 show a fixed orientation of the C-H protons in the N-isopropyl substituents toward the metal center, suggesting interesting C-H⋯ Pd preagostic interactions. These interactions are retained in solution as indicated by the large downfield shift of these C-H protons in the 1H NMR spectrum. UV-vis and CV studies revealed that the dinuclear complexes 2-4 have electrochemical behavior similar to that of the mononuclear species 5. © 2007 American Chemical Society.
Source Title: Organometallics
ISSN: 02767333
DOI: 10.1021/om700753d
Appears in Collections:Staff Publications

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