Highly-charged organic nanoparticles: redox-active dendrimers incorporating 9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene unitsMolecular Saddles Part 8: For part 7 of this series see: C. A. Christensen, A. S. Batsanov, M. R. Bryce and J. A. K. Howard, J. Org. Chem., 2001, 66, 3313.Electronic supplementary information (ESI) available: molecular models of 10 and 1012+ viewed along the plane of the benzene core (Fig. S1) and 18 and 1824+ viewed perpendicular to the plane of the benzene core (Fig. S2). See http://www.rsc.org/suppdata/jm/b1/b106010b/
作者:Godbert, Nicolas、Bryce, Martin R.
DOI:10.1039/b106010b
日期:2002.12.10
The incorporation of 9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene units into dendritic structures has been achieved by convergent routes. The key starting material is the 4-(hydroxymethyl) derivative 3. The branches contain aryl ester and aryl ether groups and the core reagent is benzene-1,3,5-tricarbonyl chloride. Dendrimers 10, 15 and 18 with 6 and 12 redox units at the periphery have been characterised by 1H NMR spectroscopy, elemental analysis, mass spectrometry, UV-vis spectroscopy and solution electrochemistry. The 9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene redox chemistry is retained in the dendrimer structures: clean formation of hexa(dication) and dodeca(dication) species is observed upon electrochemical oxidation. These
highly-charged species enjoy remarkable electrochemical stability as their reduction to the neutral species is thwarted by the loss of aromaticity and the marked conformational change which accompanies this process. Molecular modelling studies were performed on 10, 1012+, 18 and 1824+ by molecular mechanics.
通过收敛合成路线,已经实现了将9,10-双(1,3-二硫醇-2-亚甲基)-9,10-二氢蒽单元并入树枝状结构中。关键的起始材料是4-(羟甲基)衍生物3。分支包含芳基酯和芳基醚基团,核心试剂是苯-1,3,5-三羰基氯。具有6和12个氧化还原单元在表面的树枝状分子10、15和18已通过1H NMR光谱、元素分析、质谱、紫外-可见光谱和溶液电化学进行了表征。9,10-双(1,3-二硫醇-2-亚甲基)-9,10-二氢蒽的氧化还原化学在树枝状结构中得以保留:通过电化学氧化,观察到形成了六(二阳离子)和十二(二阳离子)物种。这些高度带电的物种具有显著的电化学稳定性,因为它们还原为中性物种的过程受到了失去芳香性和伴随该过程的显著构象变化的影响。通过分子力学对10、1012+、18和1824+进行了分子建模研究。