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New neodymium ( 1a ) and samarium ( 1 b ) complexes with the general formula [Ln III (NO 3 ) 3 (H 2 O) 3L ]· L  ( 1 ) were synthesized based on the previously reported ligand  L  ( L  = (1 E ,2 E )-3-(furan-2-yl)- N -(4 H -1,2,4-triazol-4-yl)prop-2-en-1-imine) which were investigated by X-ray analysis. Through X-ray studies, it was shown that the Schiff base  L  coordinates to Ln III  via κ N -bonding of one of the triazole ring nitrogen atoms as a monodentate ligand, three κ 2OO ′-bonded nitrate ions and three κ O -bonded water molecules completing the coordination sphere around the Ln III  ion, resulting in a tenfold-coordinated LnNO 9  unit in a distorted bicapped square antiprismatic geometry. The mononuclear complex units [Ln(NO 3 ) 3 (H 2 O) 3 · L ] are linked to the  L  molecule through intermolecular hydrogen-bonding interactions to form a 2 D polymeric supramolecular architecture. The complexes are neutral and paramagnetic mononuclear complexes, as determined by conductivity and magnetic investigations at room temperature, as well as findings from FT-IR and UV–vis spectroscopy. Finally, thermogravimetric measurements confirm the presence of three water molecules in the coordination sphere. In the visible region, the spectrum of the complex shows typical parity forbidden narrow  4f–4f  absorptions originating from the  4I9/2  ground state to the various excited states of Nd III .

Synthesis, characterization, and crystal structure of Ln III – ( 1E,2E )-3-(furan-2-yl)- N -(4 H -1,2,4-triazol-4-yl)prop-2-en-1-imine