Abstract
Condensation of 2,6-diformyl-4-methylphenol with aliphatic diamines, NH 2 (CH 2 ) n NH 2 (n = 2–4) in the presence of [Ru(dmso) 4 Cl 2 ] (dmso = dimethyl sulfoxide) resulted in acyclic dinuclear six-co-ordinate ruthenium(II) complexes [Ru 2 L(dmso) 4 Cl 4 ]. The crystal structure of a representative complex was determined. However these reactions in the presence of PPh 3 gave four-membered cyclometallated dinuclear complexes [Ru 2 L′(PPh 3 ) 4 (CO) 2 Cl 2 ]. Compounds formed by condensation of 2,6-diformyl-4-methylphenol with aromatic monoamines reacted with [Ru(dmso) 4 Cl 2 ]–PPh 3 to give cyclometallated mononuclear ruthenium(II) complexes. The structure of a representative complex was determined. The facile formation of cyclometallated ruthenium complexes is rationalised.
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