A gapped spin liquid: Quantum spin liquids avoid conventional magnetic ordering down to the lowest temperatures. Among the candidates for this state of matter, organic salts such as κ-(BEDT-TTF) ₂ Cu ₂ (CN) ₃ have been prominent. Miksch et al. studied this material using electron spin resonance to elucidate the nature of its ground state. Instead of the expected gapless state, the temperature dependence of spin susceptibility suggests the formation of a spin gap. Science , this issue p. 276

An unprecedented quinonoid-bridged dicopper(I) complex is described together with its redox, EPR and structural properties, which indicate a non-innocent role of the zwitterion-derived bridging ligand.

Electron transfer and delocalization of the π systems were investigated in mono- and dinuclear Ru complexes with the zwitterionic ligand L = N,N′-diisopropyl-2-amino-5-alcoholate-1,4-benzoquinonemonoiminium.