A series of half-sandwich and sandwich complexes of the nine-membered
mixed donor macrocyclic 1-thia-4,7-diazacyclononane
([9]aneN
2
S) with metals in different oxidation states has
been synthesized and characterized. In each case, the ligand provides
tridentate face-capping co-ordination to the metal ion. X-Ray
crystallographic structure determinations have been performed for most
complexes; [Fe([9]aneN
2
S)
2
]
2+
and
[Zn([9]aneN
2
S)
2
]
2+
display
trans-octahedral N
4
S
2
co-ordination. The
metal–nitrogen and metal–sulfur bond distances are greater
than the respective lengths in the homoleptic complexes
[M([9]aneN
3
)
2
]
2+
and
[M([9]aneS
3
)
2
]
2+
(M = Fe
or Zn, [9]aneN
3
= 1,4,7-triazacyclononane,
[9]aneS
3
= 1,4,7-trithiacyclononane). In the
complexes of metal ions with larger radii, e.g.
Rh
III
and Tl
I
, the metal–sulfur distances
are equal to or smaller than those in the complexes of
[9]aneS
3
. The difference between the metal–nitrogen and
the metal–sulfur bond lengths varies from 0.21 Å to 0.40
Å in the complexes studied. Both λλλ and
λδλ conformations of the three chelate rings formed
were observed.
一系列九元混合供体宏环1-
硫-4,7-二氮环诺烯 ([9]aneN₂S) 的半夹心和夹心
金属配合物在不同的氧化态下被合成和表征。在每种情况下,
配体为
金属离子提供了三齿面封闭配位。大多数配合物进行了X射线晶体结构测定;[Fe([9]aneN₂S)₂]²⁺和[Zn([9]aneN₂S)₂]²⁺显示出反式八面体N₄S₂配位。
金属-氮和
金属-
硫的键长大于同
配体配合物[M([9]aneN₃)₂]²⁺和[M([9]aneS₃)₂]²⁺中的相应长度(M = Fe或Zn,[9]aneN₃ = 1,4,7-三氮环诺烯,[9]aneS₃ = 1,4,7-三
硫环诺烯)。在
金属离子半径较大的配合物中,例如Rh³⁺和Tl¹⁺,
金属-
硫距离等于或小于[9]aneS₃配合物中的距离。在所研究的配合物中,
金属-氮和
金属-
硫的键长差异在0.21 Å到0.40 Å之间。观察到形成的三个螯合环的 λλλ 和 λδλ 构象。