The researchers compared the carbon nanosolenoid with Riemann plates

The researchers compared the carbon nanosolenoid with Riemann plates

Image of CNS and Riemann or. Money: WANG Jinyi et al.

Albert Einstein constructed models of ordinary relativity using Riemann geometry. In addition to his major work in mathematics and physics, Riemann geometry provided predictions for the properties of curved carbon materials. However, the synthesis of such hard carbons with Riemann classes is very complex.

In a study published in Nature Communications, a research group led by Prof. Du Pingwu from the University of China Science and Technology (USTC) of the Chinese Academy of Science, reported the synthesis of an π-extended nanographene carbon nanosolenoid (CNS). It is present in regular graphene spiral planes, similar to the typical Riemann surface. The CNS has shown exceptional photoluminescence and magnetic properties.

To obtain the material, the researchers first performed the polyphenylene precursor (P1) via a Pd-mediated Suzuki coupling, and then performed a Scholl reaction as a cyclodehydrogenation step. They confirmed the survival of the CNS by detecting changes in the solid-state nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR) spectrum between P1 and the CNS.

Due to its long π-conjugation, the CNS exhibits a red release group compared to P1. The survival of P1 and CNS differs as measured by time-determined photoluminescence (TRPL), indicating the influence of π-conjugation on the CNS.

Normal TEM, because of its high energy, damages the CNS. Therefore, the researchers took a low-dose scan combined with differential scanning transmission electron microscopy (iDPC-STEM) and examined the CNS helix. The helical pitch and width were the same in the calculation.

The researchers studied the magnetic and electrical properties of the CNS. As shown by electron paramagnetic resonance (EPR) spectroscopy, a large amount of radicaloids reside in the CNS in the hot room. Superconducting quantum interference device (SQUID) magnetometry has shown a magnetization effect below 150 K. In addition, a large thermal hysteresis below 10 K can be observed due to the breaking of π-electrons at according to the helix shape.

This work introduced a simple synthetic pathway of the CNS with Riemann skins, and made it possible to study the new physiological properties of such compounds.

Synthesis and properties of wing type nanographene

More information:
Jinyi Wang et al, Synthesis of a magnetic π-extended carbon nanosolenoid with Riemann surfaces, Nature Communications (2022). DOI: 10.1038 / s41467-022-28870-z

Presented by the Chinese Academy of Science

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