From spin-labelled fused polyaromatic compounds to magnetically active graphene nanostructures

Abstract

Molecular design of magnetically active graphene nanoscale structures is an emerging field of research. The key goal of this research is to produce graphene nanoribbons and graphene quantum dots with specified electronic, optical and magnetic properties. The review considers methods for the synthesis of spin-labelled polycyclic aromatic hydrocarbons, which are homologous precursors of graphene nanostructures, and discusses the advances and prospects of the design of magnetically active graphene materials. The bibliography includes 134 references.

Preparation of Multi‐Spin Systems: A Case Study of Tolane‐Bridged Verdazyl‐Based Hetero‐Diradicals

“…As for diradicals stability, ‘Kuhn'‐verdazyl‐oxoverdazyls have the shortest lifetime, and the nitronyl nitroxide‐containing diradicals are much more stable. The diradicals have sufficient differences in the redox potentials of the spin moieties; therefore, they may be independently reduced or oxidized, providing novel opportunities for the switchable materials design . In general, the Sonogashira cross‐coupling reaction represents a versatile synthetic tool for the fast and straightforward screening of novel organic magnetic materials based on multi‐spin systems.…”

2‐(8‐Iodonaphthalen‐1‐yl)‐Substituted Nitronyl Nitroxide: Suppressed Reactivity of Iodine Atom and Unusual Temperature Dynamics of the EPR Spectrum

“…A solution of 1,8-diiodonaphthalene 1 (190 mg, 0.5 mmol), gold complex 2 (615 mg, 1.0 mmol), and Pd(PPh 3 ) 4 (100 mg) in tetrahydrofuran (20 ml) was stirred at 60°C in a nitrogen atmosphere for 18 h. According to TLC, the reaction mixture contained one main product (monoradical 3), minor side products, and small particles of gold. The solvent was evaporated, and the residue was purified by silica gel (deactivated by the addition of 10 wt % of water) column chromatography using CH 2 Crystallographic Analysis. The polymorphic modification 3-1 was obtained by crystallization of 3 from a mixture of CH 2 Cl 2 with nheptane; other polymorphic modification 3-2 was obtained from ether.…”

“…Advances in the synthetic chemistry of stable radicals and graphene nanocarbon structures have laid the foundation for the emergence -at the intersection of these disciplines -a new area of research in the field of molecular magnetism associated with the study of spin-labeled graphene nanoscale molecules. [1,2] Such molecules are necessary for the development of promising technologies in the field of organic and graphene spintronics and magnetronics; therefore, the number of both theoretical and experimental studies on this topic has been growing recently. [3][4][5][6] To develop this new area, first of all, various spin-labeled graphene structures must be obtained, and this task requires systematic exploratory research aimed at developing the methods for introducing spin carriers into a nanographene backbone.…”

Novel Synthetic Approach to Heteroatom Doped Polycyclic Aromatic Hydrocarbons: Optimizing the Bottom-Up Approach to Atomically Precise Doped Nanographenes

“…Exhaustive and analytical reviews by Mullen et al [ 19 , 20 ] have recently analyzed the historical role of PAHs and how they transformed from subjects of fundamental and theoretical interest into the protagonists of a “hot” area of research in which the expertise of synthetic organic chemistry is perfectly combined with those of material sciences. A number of recent reviews on this [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ] testify the amount of research work dedicated to PAHs, their heteroatom doped derivatives and their applications. To avoid overlaps and to offer to the reader an updated picture of the state of the art, we decided to limit our analysis to works published in the last two years.…”