Complexes (TBA+){(TMI-NPS)2.Ln(III)I4)(-) (Ln = Dy, Tb) with two axial photochromic spiropyran ligands: photoswitching and zero-field SIM behaviour with a high magnetization blocking barrier for the Dy complex

Two photochromic spiropyran molecules (1,3,3-trimethylindolino-β-naphthopyrylospiran, TMI-NPS) react in the open form with LnIII iodides (Ln = Dy, Tb) to form in the presence of TBAI crystalline (TBA+){(TMI-NPS)2.Ln(III)I4)(-).0.5C6H4Cl2 (1 and 2,...