Guanidines as neutral monodentate ligands; syntheses and crystal structures of [Co{PhN[double bond, length half m-dash]C(NHPh)₂}₂Cl₂] and [Ag{PhN[double bond, length half m-dash]C(NHPh)₂}][SO₃CF₃]

Abstract

Two complexes exhibiting monodentate metal co-ordination of a neutral guanidine have been synthesized and structurally characterised. Treatment of CoCl₂ with 1,2,3-triphenylguanidine in tetrahydrofuran solution produced the tetrahedral complex [Co{(PhN)C(NHPh)₂}₂Cl₂] 1 in which the guanidine ligands are co-ordinated through their imine nitrogen atoms alone. Similarly, treatment of the guanidine with Ag[SO₃CF₃] in toluene provided the linear complex [Ag{(PhN)C(NHPh)₂}₂][SO₃CF₃] 2 in which the triflate counter ion remains unco-ordinated, but is hydrogen bonded to the guanidine hydrogen atoms. Both complexes have been characterised by X-ray crystallography.

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