Dinuclear Ln III Complexes with 9‐Anthracenecarboxylate Showing Field‐Induced SMM and Visible/NIR Luminescence

The reaction of several Ln(NO 3 ) 3 · 6H 2 O salts with 9‐anthracenecarboxylic 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 exchange for the isotropic Gd III compound 3 . Compounds 1 , 5 , and 6 exhibit field‐induced single‐molecule magnet (SMM) behavior. The luminescence properties of compounds 1 – 6 in the solid state have been studied at different temperatures and show sensitization of the 4f–4f emission bands in the NIR range for compounds 1 , 5 , and 6 .