Ein dendritischer Makrocyclus als organisches High-spin-Polyradikal mitS=10-Grundzustand

Magnetic force microscopy (MFM) was applied to study both the molecular image and the magnetic response of π‐conjugated, non‐Kekulé‐, and nondisjoint‐type poly(1,2‐phenylenevinylene) (nondisjoint refers to a molecule in which non‐bonding molecular orbitals share the same region in the molecule and a multiplet ground state is significantly stabilized) networks bearing 4‐substituted di‐tert‐butylphenoxyl moities. The polyphenoxyl radicals 1 with molecular weights of 2.6, 9.3, and 32 kDa have a substantial stability even at room temperature and in air, and molecular sizes in the nanometer range of 10, 20, and 35 nm, respectively, with a disk‐like shape. The MFM clearly shows a magnetic gradient response exactly on the position of the polyradical molecule dispersed on a graphite surface. The MFM molecular image of polyradical samples with different molecular weights and spin concentrations was examined as a nanoscale and single‐molecular‐based magnetic dot.

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Transformation of Imine Cages into Hydrocarbon Cages

Schick

Lauer

Röminger

et al. 2019

Angewandte Chemie

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In contrast to organic cages which are formed by exploiting dynamic covalent chemistry, such as boronic ester cages, imine cages, or disulfide cages, those with a fully carbonaceous backbone are rarer. With the exception of alkyne metathesis based approaches, the vast majority of hydrocarbon cages need to be synthesized by kinetically controlled bond formation. This strategy implies a multiple step synthesis and no correction mechanism in the final macrocyclization step, both of which are responsible for low overall yields. Whereas for smaller cages the intrinsic drawbacks are not always obvious, larger cages are seldom synthesized in yields beyond a few tenths of a percent. Presented herein is a three‐step method to convert imine cages into hydrocarbon cages. The method has been successfully applied to even larger structures such as derivatives of C72H72 , an unknown cage suggested by Fritz Vögtle more than 20 years ago.

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Ein dendritischer Makrocyclus als organisches High-spin-Polyradikal mitS=10-Grundzustand

Cited by 15 publications

References 30 publications

The Tetraaza[1.1.1.1]m,p,m,p-cyclophane Dication: A Triplet Diradical Having Twom-Phenylenediamine Radical Cations Linked by Twisted Benzenes

The Tetraaza[1.1.1.1]m,p,m,p-cyclophane Dication: A Triplet Diradical Having Twom-Phenylenediamine Radical Cations Linked by Twisted Benzenes

Magnetic Force Microscopy Images of a Nanometer‐Sized, Purely Organic High‐Spin Polyradical

Transformation of Imine Cages into Hydrocarbon Cages

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