The carboxylate-bridged polymer [{Ru2[μ-η2-OC(R)O] 2(CO)4}n] (R = H, Me or Et) as a synthon in the synthesis of dinuclear phosphorus pyridyl-, quinolyl- and bipyridyl-bridged derivatives of ruthenium(I)
作者:John S. Field、Raymond J. Haines、Campbell J. Parry
DOI:10.1039/a701897e
日期:——
Treatment of
[Ru
2
[µ-η
2
-OC(R)O]
2
(CO)
4
}
n
] or its acetonitrile
adduct
[Ru
2
µ-η
2
-OC(R)O}
2
(CO)
4
(MeCN)
2
] (R = H, Me or
Et) with a two-fold molar equivalent of the phosphorusânitrogen
ligands 2-diphenylphosphinopyridine (dppy), 2-diphenylphosphinoquinoline
(dpquin) and 6-diphenylphosphino-2,2â²-bipyridine (dpbipy) in
alcohol under reflux resulted in the formation of dinuclear products of
the type
[Ru
2
µ-η
2
-OC(R)O}
2
(CO)
4
(PPh
2
Râ²)
2
]
(Râ² = pyridyl, quinolyl or bipyridyl) in which the
PPh
2
Râ² ligands are monodentate, co-ordinating axially
through the phosphorus donor atoms, as established X-ray
crystallographically for
[Ru
2
µ-η
2
-OC(Me)O}
2
(CO)
4
(dppy)
2
]. On the other hand reaction
of
[Ru
2
[µ-η
2
-OC(R)O]
2
(CO)
4
}
n
] with 2 molar
equivalents of dppy or dpquin in toluene under reflux in the presence of
NH
4
PF
6
and under a slight pressure of carbon
monoxide afforded products of the type
[Ru
2
µ-η
2
-OC(R)O}(CO)
4
(µ-dppy)
2
]PF
6
or
[Ru
2
µ-η
2
-OC(R)O}(CO)
4
(µ-dpquin)
2
]PF
6
in which
the dppy or dpquin ligands adopt the bridging co-ordination mode, this
mode of co-ordination being confirmed through a crystal structure
determination on
[Ru
2
µ-η
2
-OC(H)O}(CO)
4
(µ-dppy)
2
]PF
6
. Reaction of
[Ru
2
[µ-η
2
-OC(R)O]
2
(CO)
4
}
n
] with dpbipy in
n-butanol under reflux likewise afforded products, isolated as
their hexafluorophosphate salts, in which the phosphorusânitrogen
ligands are bridging, viz.
[Ru
2
µ-η
2
-OC(R)O}(CO)
2
(µ-dpbipy)
2
]PF
6
, the
structure of
[Ru
2
µ-η
2
-OC(Me)O}(CO)
2
(µ-dpbipy)
2
]PF
6
being
established X-ray crystallographically.
将Ru 2 µ-Î- 2 -OC(R)O] 2 (CO) 4 } n ]或其乙腈加合物[Ru 2 µ-Î- 2 -OC(R)O} 2 (CO) 4 (MeCN) 2 ](R = H、2-二苯基膦吡啶(dppy)、2-二苯基膦喹啉(dpquin)和 6-二苯基膦-2、2â²-bipyridine (dpbipy)在酒精中回流,形成了[Ru 2 µ-Î- 2 -OC(R)O} 2 (CO) 4 (PPh 2 Râ²) 2 ](Râ² = 吡啶基、Râ²=吡啶基、喹啉基或双吡啶基),其中的 PPh 2 Râ² 配体为单配位,通过磷供体原子轴向配位,这一点已在 X 射线晶体学中为[Ru 2 µ-Î- 2 -OC(Me)O} 2 (CO) 4 (dppy) 2 ]所证实。另一方面,[Ru 2 µ-Î- 2 -OC(R)O] 2 (CO) 4 } n ] 与 2 摩尔当量的 dppy 或 dpquin 在甲苯中,在 NH 4 PF 6 的存在下和一氧化碳的轻微压力下,在回流条件下反应,得到[Ru 2 µ-Î- 2 -OC(R)O] 2 (CO) 4 } n 型产物。δ-2-OC(R)O}(CO)4(µ-dppy) 2 ]PF 6 或 [Ru 2 µ-δ- 2 -OC(R)O}(CO) 4 (µ-dpquin)2]PF6,其中 dppy 或 dpquin 配体采用桥式配位模式、通过对[Ru 2 µ-Î- 2 -OC(H)O}(CO) 4 (µ-dppy) 2 ]PF 6 的晶体结构测定,证实了这种配位模式。在正丁醇中,[Ru 2 µ-Î- 2 -OC(R)O] 2 (CO) 4 } n ]与 dpbipy 在回流条件下反应,同样得到了分离为六氟磷酸盐的产物,其中磷氮配位体是桥联的,即:[Ru 2 µ-Î- 2 -OC(H)O}(CO) 4 (µ-dppy) 2 ]PF 6 。
[Ru 2 µ-Î- 2 -OC(R)O}(CO) 2 (µ-dpbipy) 2 ]PF 6 的结构是通过 X 射线晶体学确定的。