Abstract
Abstract Five new heterometallic complexes with a {Ln[RuNO(µ-NO2)4(µ3-OH)]2Ln} (Ln = Gd, Tb, Dy, Ho, Lu) core were prepared by the reaction of Na2[RuNO(NO2)4OH] with lanthanide nitrates. Investigation of magnetic properties showed that magnetic interactions between lanthanide ions become apparent at temperatures lower than 40–50 K, while at temperatures higher than 100 K the dependencies of magnetic susceptibility of the complexes are well explained by the presence of two non-interacting paramagnetic centres. Frequency dependencies of magnetic susceptibility for the dysprosium complex in the temperature range 10–30 K revealed single molecule magnet (SMM) properties with a thermally activated slow magnetic relaxation process. The anisotropy barrier is 89.4 cm−1 (112 K) and τ0 = 7.6 × 10−7 s. Irradiation of the Dy2Ru2 complex with blue light (443 nm) at 80 K resulted in the formation of nitrosyl linkage isomers of the RuNO fragment; the Td of reverse isomerisation is 195 K.
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