The reaction of several Ln(NO 3 ) 3 ·6H 2 O salts with 9anthracenecarboxylic acid (9-HAC) and 2,2′-bipyridine (bpy) in a mixture of CH 3 OH/H 2 O has allowed the isolation of the dinuclear compounds 1-6 with formula [Ln 2 (μ 2 -9-AC) 4 (9-AC) 2 (bpy) 2 ] [Ln III = Nd (1), Eu (2), Gd (3), Tb (4), Er (5), and Yb (6)]. The molar magnetic susceptibility measurements of 1-6 in the 2-300 K temperature range indicate weak antiferromagnetic ex- [a]