Verdazyl-based extended structures: synthesis, structures and magnetic properties of silver(i) one dimensional compounds

Abstract

The reactions of silver(I) perchlorate with 3-(4,6-dimethyl-2-pyrimidyl)-1,5-dimethyl-1,2,4,5-tetrazane 6-oxide and its oxidized form, the radical 3-(4,6-dimethyl-2-pyrimidyl)-1,5-dimethyl-6-oxoverdazyl, afford one-dimensional compounds 1 and 2. Single crystal X-ray diffraction shows that both compounds are built from cationic chains of silver(I) ions bridged by bidentate ligands. The one-dimensional objects are isolated from one another by perchlorate ions and solvent molecules. The oxidation state of the ligands is preserved during the reaction, even under aerobic conditions. The verdazyl derivative presents an intrachain antiferromagnetic exchange interaction J = −7.5 cm⁻¹ (H = −JΣS_i·S_i+1) between two radicals through the diamagnetic silver(I) ion.