Synthesis and characterisation of ruthenium(II) arene complexes containing κ3- and κ2-poly(pyrazolyl)borates and methanes
Abstract
Treatment of a fresh acetonitrile solution of
[{Ru(η
6
-arene)Cl
2
}
2
] with
poly(pyrazolyl)borates and methanes such as
[HXR
3
]
n-
[X = B,
R = pyrazolyl (pz); X = C,
R = 3,5-dimethylpyrazolyl (dmpz)] resulted in formation of
novel ruthenium compounds of the following type
[Ru(η
6
-arene){κ
2
-HXR
3
}Cl]
n+
(X = B,
n = 0, R = pz,
arene = p-xylene 2, mesitylene 3 or
hexamethylbenzene 6; X = C, n = 1,
R = pz 7, dmpz 8, arene = benzene;
R = dmpz, arene = p-xylene 9). Syntheses
of the mixed-sandwich complexes of the type
[Ru(η
6
-arene){κ
3
-HB(pz)
3
}][PF
6
] (arene = p-xylene 1a,
mesitylene 4 or hexamethylbenzene 5a) are also reported from aged
solutions. The hapticity change of the tridentate ligand from
κ
2
to κ
3
can be affected by either
warming the bis-chelated compounds in a polar solvent such as MeCN or by
treatment with methanolic [NH
4
][PF
6
]. Crystal
structures of
[Ru(η
6
-C
6
Me
6
){κ
2
-HB(pz)
3
}Cl] and
[Ru(η
6
-C
6
H
6
){κ
2
-HC(dmpz)
3
}Cl][PF
6
] have been
determined.
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