Ferromagnetic Properties of a Trinuclear Nickel(II) Complex with a Trithiocyanurate Bridge

A novel trinuclear nickel(II) complex with N,N,N',N '',N ''-pentamethyldiethylenetriamine (pmdien) and a trithiocyanurate(3-) (ttc(3-)) bridge of composition [Ni-3(pmdien)(3)(mu-ttc)](ClO4)(3) (1) was prepared. The X-ray crystal structure of I was determined, revealing the tris-N,S chelating mode of the trithiocyanurate bridge, forming a regular triangular Ni-3(II) core. A deformed trigonal bipyramidal arrangement of the central atoms was further achieved by coordination of three pmdien N atoms. The complex shows a ferromagnetic exchange interaction among the Ni-II magnetic centers that is tuned by single-ion anisotropy and/or antisymmetric exchange. The complex orders ferromagnetically at T-c = 10 K and exhibits spin-glass properties. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)