Control of Electronic and Magnetic Coupling via Bridging Ligand Geometry in a Bimetallic Ytterbocene Complex
作者:Christin N. Carlson、Brian L. Scott、Richard L. Martin、Joe D. Thompson、David E. Morris、Kevin D. John
DOI:10.1021/ic0702973
日期:2007.6.1
The ligand 1-methyl-3,5-bis(2,2':6',2' '-terpyridin-4'-yl)benzene has been employed in the synthesis of a new bimetallic ytterbocene complex [(Cp*)2Yb](1-methyl-3,5-bis(2,2':6',2' '-terpyridin-4'-yl)benzene)[Yb(Cp*)2] (1) and the doubly oxidized congener [1]2+ in an attempt to determine the impact of the bridging ligand geometry on the magnetic/electronic properties as compared to the previously reported
配位体1-甲基-3,5-双(2,2':6',2''-萜吡啶-4'-基)苯已用于合成新的双金属复合物[(Cp *)2Yb ](1-甲基-3,5-双(2,2':6',2''-terpyridin-4'-基)苯)[Yb(Cp *)2](1)和双氧化同类物[ 1] 2+,试图确定桥配体几何形状对磁性/电子性质的影响,与先前报道的1,4-类似物[(Cp *)2Yb](1,4-二(叔吡啶基)苯)[Yb(Cp *)2](2)。电化学,电子和磁性数据提供了令人信服的证据,与2相比,与1的桥联配体相关的1,3几何形状在抑制金属中心之间的电子通讯和自旋载体的磁耦合方面起到了有效的作用。实际上,与1相关的物理数据与单金属类似物(Cp *)2Yb(tpy)的报告数据非常相似(3)。特别是,[1] 2+的ff轮廓在光谱特征上几乎与[3] +的相同,但强度几乎精确地加倍。此外,在这些双金属茂金属配合物中,金属基还原波