Iron in a Cage: Fixation of a Fe(II)tpy
<sub>2</sub>
Complex by Fourfold Interlinking
作者:Thomas Brandl、Sven Johannsen、Daniel Häussinger、Nithin Suryadevara、Alessandro Prescimone、Stefan Bernhard、Manuel Gruber、Mario Ruben、Richard Berndt、Marcel Mayor
DOI:10.1002/anie.202006340
日期:2020.9.7
fully characterized. While temperature independent low‐spin states were recorded with superconducting quantum interference device (SQUID) measurements for both, the open precursor 8 and the interlinked complex 1, evidence of the increased rigidity of the ligand sphere in 1 was provided by proton T2 relaxation NMR experiments. The ligand sphere fixation in the macrocyclized complex 1 even reaches a
Fe(II) 三联吡啶配合物1的配位层通过两个三联吡啶配体的四重互连而刚性化。受益于八醛前体络合物,在不可逆维蒂希烯化提供刚性络合物之前,互连结构的理想尺寸由可逆希夫碱形成决定。反相 HPLC 能够分离Fe(II) 三联吡啶络合物1的全反式异构体,并对其进行了充分表征。虽然超导量子干涉装置 (SQUID) 测量记录了开放前体8和互连配合物1 的与温度无关的低自旋态,但质子 T 2弛豫 NMR提供了1中配体球体刚性增加的证据实验。大环化配合物1中的配体球固定甚至达到了在Au(111)表面沉积时抵抗显着变形的水平,正如低温超高真空扫描隧道显微镜实验中其原始形式所证明的那样。