Chelated bis(NHC) complexes of saturated (imidazolin-2-ylidene) NHC ligands: structural authentication and facile ligand fragmentation

The CH 2 -linked bis(NHC) complexes [{( S MesIm) 2 CH 2 }PdBr 2 ] and [{( S MesIm) 2 CH 2 }Pd(NCMe) 2 ][PF 6 ] 2 are reported. These represent the first structurally characterized chelated, saturated bis(NHC) complexes. The complexes are subject to facile ligand fragmentation during their synthesis....

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Published inDalton transactions : an international journal of inorganic chemistry Vol. 46; no. 9; pp. 3051 - 3058
Main Authors Gardiner, Michael G., McGuinness, David S., Vanston, Catriona R.
Format Journal Article
LanguageEnglish
Published England 28.02.2017
Subjects
Acetates
Authentication
Fragmentation
Ligands
Palladium
Synthesis
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Summary:The CH 2 -linked bis(NHC) complexes [{( S MesIm) 2 CH 2 }PdBr 2 ] and [{( S MesIm) 2 CH 2 }Pd(NCMe) 2 ][PF 6 ] 2 are reported. These represent the first structurally characterized chelated, saturated bis(NHC) complexes. The complexes are subject to facile ligand fragmentation during their synthesis. Longer (CH 2 ) n -linkers in the imidazolin-2-ylidene-based series of ligands afforded the pendant imidazolinium mono(NHC) complexes [{( S MesImH)( S MesIm)(CH 2 ) n }PdBr 3 ] by reaction of the diimidazolinium salts ( n = 2, 3) with palladium acetate. These did not react to give the bis(NHC) complexes, as was the case for [{( S MesImH)( S MesIm)CH 2 }PdX 3 ] (X = Br, I). Disilver( i ) complexes [{( S MesIm) 2 (CH 2 ) n } 2 Ag 2 ][PF 6 ] 2 n = 1 and 3, were also prepared.
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ISSN:1477-9226
1477-9234
1477-9234
DOI:10.1039/C7DT00327G