Control of the “Superexchange” Interaction through Diphenyl Sulfide 4,4‘-Diyl Magnetic Coupler by Changing the Oxidation State and Conformation of the Sulfur Atom
作者:Kenji Matsuda、Takehiro Yamagata、Tomoo Seta、Hiizu Iwamura、Kenzi Hori
DOI:10.1021/ja9643984
日期:1997.8.1
ferromagnetic coupler. On the other hand, as the oxidation state or the geometry of the sulfur atom was changed to sulfoxide, sulfone, and thiaxanthene groups, antiferromagnetic interaction was observed between the two diphenylcarbene units. The magnitude of the exchange interaction J/k was determined to be 11, −30, −92, and −21 K for diphenyl sulfide, sulfoxide, sulfone 4,4‘-diyl, and thiaxanthene 2,7-diyl couplers
研究了两个三线态卡宾中心通过二苯硫醚 4,4'-二基、其亚砜和砜类似物以及噻吨 2,7-二基偶联单元之间的交换相互作用。这些双卡宾是通过 MTHF 基质中相应的双重氮前体在低温下光解产生的。从 ESR 信号的温度依赖性发现,通过硫化物基团连接的双卡宾具有五重基态;它用作铁磁耦合器。另一方面,随着硫原子的氧化态或几何结构变为亚砜、砜和噻吨基团,在两个二苯基卡宾单元之间观察到反铁磁相互作用。对于二苯硫醚、亚砜、砜 4,交换相互作用 J/k 的大小确定为 11、-30、-92 和 -21 K,分别为 4'-二基和噻吨 2,7-二基偶联剂。在空间不受约束的硫化物及其类似物的 ESR 光谱中,孤立的三线态信号是大鼠...