Syntheses and structures of dinuclear rhodium(I) complexes and 1-D zigzag-chain rhodium(I) co-ordination polymers bridged by rod-like bidentate nitrogen ligands †
作者:Masahiko Maekawa、Kunihisa Sugimoto、Takayoshi Kuroda-Sowa、Yusaku Suenaga、Megumu Munakata
DOI:10.1039/a907577a
日期:——
Novel dinuclear rhodium(I) complexes, [Rh2(2-bpbd)2(cod)2]X2 (X = BF4 1a, PF6 1b or ClO4 1c; cod = cycloocta-1,5-diene) and 1-D rhodium(I) co-ordination polymers with the linkage of square-planar rhodium(I) centers, [Rh(4-bpbd)(cod)]X}n (X = BF4 2a, PF6 2b or ClO4 2c) and [Rh(4-bpe)(cod)]X}n(X = BF43a, PF6 3b or ClO4 3c), were systematically synthesized using 1,4-bis(2-pyridyl)butadiyne (2-bpbd), 1,4-bis(4-pyridyl)butadiyne (4-bpbd) and trans-1,2-bis(4-pyridyl)ethylene (4-bpe). The structures of 1a, 2a, 2b and 3a were crystallographically characterized. In 1a each Rh atom is bridged by two N atoms of 2-bpbd to afford a unique dinuclear structure with an 18-membered Rh2N4C12 framework. In 2a, 2b and 3a, each Rh atom is bonded to two N atoms of 4-bpbd (2a and 2b) or 4-bpe (3a) and two CC bonds of cod in a square-planar geometry. The square-planar centers are in turn linked by 4-bpbd or 4-bpe ligands to form a 1-D zigzag-chain structure. The zigzag chains are located in parallel 9.6, 9.9 and 10.7 Ã
apart in 2a, 2b and 3a, respectively, and no effective intermolecular interactions were found.
新型的二核铑(I)配合物,[Rh2(2-bpbd)2(cod)2]X2(X = BF4 1a,PF6 1b或ClO4 1c;cod = 环辛-1,5-二烯)和具有平面正方形铑(I)中心连接的一维铑(I)配位聚合物,[Rh(4-bpbd)(cod)]X}n(X = BF4 2a,PF6 2b或ClO4 2c)以及[Rh(4-bpe)(cod)]X}n(X = BF4 3a,PF6 3b或ClO4 3c),采用1,4-双(2-吡啶基)丁二炔(2-bpbd)、1,4-双(4-吡啶基)丁二炔(4-bpbd)和反式-1,2-双(4-吡啶基)乙烯(4-bpe)系统合成。通过晶体结构分析,对1a、2a、2b和3a结构进行了表征。在1a中,每个Rh原子通过2-bpbd的两个N原子桥接,形成一个具有18元环的Rh2N4C12框架的独特二核结构。在2a、2b和3a中,每个Rh原子通过4-bpbd(2a和2b)或4-bpe(3a)的两个N原子和cod的两个碳碳键在一个平面正方形几何构型中连接。这些平面正方形的中心通过4-bpbd或4-bpe配体形成一个一维锯齿链结构。锯齿链分别位于彼此平行9.6、9.9和10.7 Å处,在2a、2b和3a中没有发现有效的分子间相互作用。