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Four new Ln(III)-based coordination polymers (CPs), [Eu(HL)Cl 2 (DMF) 2 ]·(H 2 L) ( 1 ), [Dy(HL)Cl 2 (DMF) 2 ]·(H 2 L) ( 2 ), [Er(HL)Cl 2 (DMF)(CH 3 OH)]·(DMF) ( 3 ) and [Yb(HL)Cl 2 (DMF)(H 2 O)]·(DMF) ( 4 ) (H 2 L=2,6-bis[(3-methoxysalicylidene)hydrazinocarbonyl]pyridine) have been synthesized through the reaction of Ln(III) chloride and H 2 L by using the vapour diffusion method. Interestingly, Cl −  as a template agent plays a vital role in the formation of the target complexes. Single-crystal X-ray diffraction studies indicate that  1  and  2  are isostructural and crystallize in triclinic space group  P 1̅, while complexes  3  and  4  are isostructural and crystallize in monoclinic space group  C 2/ c . Variable temperature magnetization measurement ( χ  M  T – T ) demonstrates possible antiferromagnetic interactions in complex  2 . Alternating-current (ac) susceptibility measurement furthermore indicated frequency dependence for both the in-phase (χ′) and out-of-phase (χ″) components in  2 , suggesting that there is a slow relaxation behavior of the magnetization, which is typical of single-molecule magnets (SMMs). This is the first time that Ln(III) CPs based on such a dihydrazone ligand has been reported so far.

Anion-directed assembly of lanthanide coordination polymers with SMMs properties based on a dihydrazone ligand