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Important Steric Effects Resulting from the Additional Substituent at Boron within Scorpionate Complexes Containing κ 3 ‐ NNH Coordination Modes
Author(s) -
Tsoureas Nikolaos,
Hope Rebecca F.,
Haddow Mairi F.,
Owen Gareth R.
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201100857
Subject(s) - chemistry , substituent , ruthenium , steric effects , boron , ligand (biochemistry) , medicinal chemistry , stereochemistry , borohydride , crystallography , catalysis , organic chemistry , biochemistry , receptor
The complexes [Ru( Tai )H(PPh 3 ) 2 ] ( 4 ) [ Tai = HB(7‐azaindolyl) 3 ] and [Ru( Ar Bai )H(PPh 3 ) 2 ] [ Ar Bai = Ar(H)B(7‐azaindolyl) 2 ; Ar = phenyl ( 5 ), mesityl ( 6 ) and 2‐naphthyl ( 7 )] have been prepared and fully characterised. Structural characterisation of complexes 4 , 5 and 7 confirmed the expected κ 3 ‐ NNH coordination mode of the azaindolyl‐based ligands. In all complexes, the borohydride unit is located trans to the hydrido ligand, and the two triphenylphosphane ligands occupy sites trans to the two nitrogen donors. The strong Ru ··· H–B interaction means that the third substituent at the boron atom is held in close proximity to the ruthenium centre. In the case of complex 7 , rotation of the naphthyl group about the boron centre is hindered by the triphenylphosphane substituents.