我们首次成功地通过使用二氧化铅(IV)的简单化学氧化合成了萘二酰亚胺(NDI)自由基和双自由基。通过UV / Vis / NIR吸收,1 H NMR和电子顺磁共振(EPR)测量来确认(di)自由基的形成。特别是,取决于温度的EPR,SQUID(超导量子干涉装置)测量和量子计算表明,所生成的NDI双自由基在基态下具有y = 0.69的单重双自由基特性。随后对该(双)自由基的表征显示了其稳定性,较大的双光子吸收截面和较短的激发态寿命。
The synthesis of a salicylaldehyde derivative facing an encumbered phenol group on a naphthalene block as a molecular shaft is reported. This molecular unit has been designed to elaborate coordinating ligands holding non-coordinating phenol group for the generation of phenoxyl radical in the close proximity of a metal complex. (c) 2005 Elsevier Ltd. All rights reserved.
Modulating Spin Delocalization in Phenoxyl Radicals Conjugated with Heterocycles
作者:Chunping Xie、Paul M. Lahti、Clifford George
DOI:10.1021/ol0063407
日期:2000.11.1
Phenoxylradicals were synthesized having heterocyclic substituents in the 4-position. Electronspin resonance spectroscopy shows spin density can be modulated by delocalization onto the heterocycle structure, to the extent that some of the largest spin density bearing sites in 3 and 4 lies in the heterocycle, not in the phenoxyl ring.
A BODIPY-Bridged Bisphenoxyl Diradicaloid: Solvent-Dependent Diradical Character and Physical Properties
作者:Fang Miao、Hoa Phan、Jishan Wu
DOI:10.3390/molecules24081446
日期:——
closed-shell diamagnetic character in less polar solvents such as dichloromethane but open-shell diradical character with paramagnetic activity in the very polar solvent N,N-dimethylformamide. X-ray crystallographic analysis of 2 revealed an anti-parallel stacked dimer structure via intermolecular dipole–dipole interaction, and the observed solvent-dependent diradical character can be explained by the
Heterophenoquinones: Tuning Optoelectronics and Electrochromicity
作者:Willi M. Amberg、Sebastian N. Intorp、Evgenia Dmitrieva、Alexey A. Popov、Frank Rominger、Jan Freudenberg、Uwe Heiko Bunz
DOI:10.1002/chem.202203862
日期:——
Electrochromism: A modular access to 16 intensely colored, redox-active heterophenoquinones is presented. Structure to property relationships are identified. This material class is promising as cathodically decoloring electrochromes with well-defined structures and redox states.