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.
将新鲜的
乙腈溶液 [Ru(η^6-arene)Cl₂}₂] 与多
吡唑基
硼酸盐和
甲烷(如 [HXR₃],其中 X = B,R =
吡唑基(pz);X = C,R =
3,5-二甲基吡唑基(dmpz))反应,形成了以下类型的新型
钌化合物 [Ru(η^6-arene)κ₂-HXR₃}Cl]ⁿ⁺(X = B,n = 0,R = pz,arene =
对二甲苯 2、梅西烯 3 或
六甲基苯 6;X = C,n = 1,R = pz 7、dmpz 8,arene = 苯;R = dmpz,arene =
对二甲苯 9)。还报道了从陈放溶液中合成混合三明治型配合物 [Ru(η^6-arene)κ₃-HB(pz)₃}][PF₆](arene =
对二甲苯 1a、梅西烯 4 或
六甲基苯 5a)。三齿
配体的配位方式从 κ₂ 变为 κ₃ 可以通过在极性溶剂(如 MeCN)中加热双螯合化合物或用
甲醇溶液 [NH₄][PF₆] 处理来实现。[Ru(η^6-C₆Me₆)κ₂-HB(pz)₃}Cl] 和 [Ru(η^6-C₆H₆)κ₂-HC(dmpz)₃}Cl][PF₆] 的晶体结构已被确定。