Magnetic properties of [Ni(dmit)2]- anions induced by flexible hydrogen-bonded supramolecular cations [(p-Xylylenediammonium)0.5(Crown ethers)]+

Flexible supramolecular cation structures, [(XyDA)0.5(crown ethers)]+ complexes, were introduced as countercations to [Ni(dmit)2]- anions, which bear an S = 1/2 spin, to form novel magnetic crystals (XyDA = p-xylylenediammonium, dmit2- = 2-thioxo-1,3-dithiole-4,5-dithiolate, and crown ethers = [12]crown-4, [15]crown-5, or [18]crown-6). Sandwich-type [(XyDA)0.5(crown ethers)]+ structures were formed through hydrogen-bonding interactions in the crystals between the ammonium moieties of XyDA and the oxygen atoms of the crown ethers. [12]Crown-4 yielded three types of [(XyDA)0.5([12]crown-4)]+[Ni(dmit)2] polymorphs, whereas two types of [(XyDA)0.5([15]crown-5)]+[Ni(dmit)2] polymorphs were obtained using [15]crown-5. Three types of [(XyDA)0.5(crown ethers)]+ structures were identified for these polymorphs. Since the flexible −CH2−NH3+ moieties connected to benzene plane have rotational freedom, the [(XyDA)0.5(crown ethers)]+ structures varied according to the conformations of the XyDA cation in the crystals. T...