Interionic Solution Structure of Acetyl RuII Complexes Bearing Diimine and Diamine Ligands by1H-NOESY and19F{1H}-HOESY NMR: Still More Specific Anion−Cation Interactions (original) (raw)

European Journal of Inorganic Chemistry, 2001

Abstract

Complexes trans-[Ru(PMe3)2(CO)(COMe)(N,N)]X (N,N = diimine or diamine ligand, X− = BF4− or BPh4−) have been synthesized by the reaction of cis,trans-[RuI(Me)(CO)2(PMe3)2] with N,N ligands having different steric and electronic properties. The syntheses were only successful with moderately hindered ligands; in other cases, solvento complexes were formed. Some of these were isolated and characterized. The interionic structures of the aforementioned cationic complexes have been investigated in dichloromethane solution by means of 1H-NOESY and 19F{1H}-HOESY NMR experiments. The anion−cation interactions (especially for the diamine complexes) were found to be more specific than those in analogous compounds bearing aromatic N,N ligands. For the first time, we have found that the anion preferentially resides close to the N arm trans to the COMe group.

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