Chemisorption of nitronyl–nitroxide radicals on gold surface: an assessment of morphology, exchange interaction and decoherence time

Abstract

A combined Tof-SIMS, XPS and STM characterization has been adopted here to study the deposition of a sulphur-functionalized nitronyl nitroxide radical on Au(111) clearly demonstrating the chemisorption of intact molecules....

Stabilization of an Enantiopure Sub‐monolayer of Helicene Radical Cations on a Au(111) Surface through Noncovalent Interactions

“…The presence of nitrogen atoms in different oxidation states after exposure to X‐rays and secondary electrons (see Figure S1) is indeed confirmed by the several components needed to properly fit the experimental data. This is in agreement with previous reports indicating that the radical function of monolayer deposits cannot survive treatment with X‐rays [14, 24, 25] . It is important to stress here that, due to this alteration, the previous characterization, as well as the following one based on synchrotron light, provide only information about the molecular backbone structure.…”

“…Actually, organic radicals have been proposed as building blocks for several multifunctional devices [6, 7] and, in particular, as spin filters in molecular spintronic devices [8, 9] because of their relatively long spin coherence length. The nanostructuration of several families of organic radicals has been investigated for this purpose, including perchlorotriphenylmethyl, 1,3‐bis(diphenylene)‐2‐phenylallyl, 2,2,6,6‐tetramethyl piperidine 1‐oxyl, and nitronyl‐nitroxide radicals [10–14] . Extra advantages [15] can be foreseen by the use of helicene radicals, in which the paramagnetic character is associated with the structural chirality [16] of the individual molecules.…”

Tethered Blatter Radical for Molecular Grafting: Synthesis of 6-Hydroxyhexyloxy, Hydroxymethyl, and Bis(hydroxymethyl) Derivatives and Their Functionalization

“…Functionalization of flat surfaces [1][2][3][4][5][6][7][8][9], polymers [10][11][12][13][14], well-defined macromolecules (dendrimers [15][16][17][18], cyclodextrins [19][20][21][22], fullerene [23], and nanotubes [24]), and nanoparticles [25][26][27][28][29][30] with stable radicals is becoming an important avenue for obtaining materials [31,32] for advanced technologies [33], which include organic electronics [11,34], spintronics [1, 3,6], contrast agents in bioimaging [15,35,36], and energy storage [12,[37][38][39]. This effort has concentrated mainly on the traditional stable radicals, such as nitroxides [6,[14][15][16]…”

Stabilization of an Enantiopure Sub‐monolayer of Helicene Radical Cations on a Au(111) Surface through Noncovalent Interactions

“…The nanostructuration of several families of organic radicals has been investigated for this purpose, including perchlorotriphenylmethyl, 1,3‐bis(diphenylene)‐2‐phenylallyl, 2,2,6,6‐tetramethyl piperidine 1‐oxyl, and nitronyl‐nitroxide radicals. [ 10 , 11 , 12 , 13 , 14 ] Extra advantages [15] can be foreseen by the use of helicene radicals, in which the paramagnetic character is associated with the structural chirality [16] of the individual molecules. This opens the possibility of tailoring the spin filtering by exploiting the chiral‐induced spin selectivity (CISS) effect.…”

“…This is in agreement with previous reports indicating that the radical function of monolayer deposits cannot survive treatment with X‐rays. [ 14 , 24 , 25 ] It is important to stress here that, due to this alteration, the previous characterization, as well as the following one based on synchrotron light, provide only information about the molecular backbone structure. Alternative techniques have been used to confirm the survival of the radical function in the monolayer.…”