Ferromagnetic Spin Coupling through the 3,4'-Biphenyl Moiety in Arylamine Oligomers-Experimental and Computational Study

Vincent Maurel; Lukasz Skorka; Nicolas Onofrio; Ewa Szewczyk; David Djurado; Lionel Dubois; Jean-Marie Mouesca; Irena Kulszewicz-Bajer

doi:10.1021/jp504223v

Ferromagnetic Spin Coupling through the 3,4'-Biphenyl Moiety in Arylamine Oligomers-Experimental and Computational Study

J Phys Chem B. 2014 Jul 10;118(27):7657-7667. doi: 10.1021/jp504223v. Epub 2014 Jun 27.

Authors

Vincent Maurel¹, Lukasz Skorka², Nicolas Onofrio¹, Ewa Szewczyk², David Djurado³, Lionel Dubois¹, Jean-Marie Mouesca¹, Irena Kulszewicz-Bajer²

Affiliations

¹ University Grenoble Alpes , INAC, SCIB, F-38000 Grenoble and CEA, INAC, SCIB, F-38054 Grenoble, France.
² Faculty of Chemistry, Warsaw University of Technology , Noakowskiego 3, 00-664 Warsaw, Poland.
³ University Grenoble Alpes , INAC, SPrAM, F-38000 Grenoble and CEA, INAC, SPrAM, F-38054 Grenoble, France.

PMID: 24927757
DOI: 10.1021/jp504223v

Abstract

This report describes the study of a dimer d²⁺ and a linear trimer t³⁺ of amminium radical cations coupled by 3,4'-biphenyl spin coupling units. The synthesis of the parent diamine and triamine and their optical and electrochemical properties obtained by UV-visible and cyclic voltammetry are presented. The chemical doping of the parent diamine d and triamine t was performed quantitatively to obtain samples containing the corresponding dimer d²⁺ and trimer t³⁺ in almost pure high-spin states as evidenced by pulsed EPR nutation spectroscopy. The J coupling constants of the corresponding S = 1 and S = 3/2 spin states were measured (J/k = 135 K) and compared quantitatively to DFT calculations.