Synthesis and molecular structure of di- and mono-nuclear Schiff-base phenolate complexes: facile formation of cyclometallated ruthenium complexes
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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