Fig. 4. Magnetic performance of Ag₇₇Cu₂₂ and Au₂₅⁰.

EPR spectra for a Au₂₅⁰ and b Ag₇₇Cu₂₂ in different states (note: the solution samples were aged for 1 h before measurements, and the amorphous samples were prepared from the above-aged solutions by fast precipitation and drying). c EPR spectra measured for Au₂₅⁰ NCs with different CHT substitution numbers. d Schematic depiction of the rotational EPR experiment. 2D EPR density plots of e Au₂₅⁰ and f Ag₇₇Cu₂₂. g Spin distribution of polymeric Ag₇₇Cu₂₂ (magenta: spin density). Spin-polarized PDOS of the h 3p orbitals of the S linkage and i 5 s orbitals of Ag bonded with the S linkage. j Schematic representation of the electronic structures of the linkage.