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Five new heterometallic complexes with a {Ln[RuNO(μ-NO 2 ) 4 -(μ 3 -OH)] 2 Ln} (Ln = Ce, Pr, Nd, Eu) core were prepared by reaction of Na 2 [RuNO(NO 2 ) 4 OH] and lanthanide nitrates in the presence of pyridine. The crystal structures of the obtained compounds were determined by single-crystal X-ray analysis. In all complexes, Ru and Ln atoms are connected by N,O-bridging nitrite groups and OH groups. The coordination environment of Ln 3+ is completed by oxygen atoms of nitrate ions and water molecules and by nitrogen atoms of pyridine molecules. Magnetic interactions between lanthan-

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