Synthesis, crystal structures and magnetic characterization of heterodinuclear Cu II Gd III and Cu II Tb III Schiff base complexes

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摘要：

Preparation, crystal structures and magnetic properties of new heterodinuclear Cu IIGd III ( 1) and Cu IITb III ( 2) complexes [CuLn(L)(NO 3) 2(H 2O) 3MeOH]NO 3·MeOH (where Ln = Gd, Tb) with the hexadentate Schiff-base compartmental ligand N, N′-bis(5-bromo-3-methoxysalicylidene)propylene-1,3-diamine (H 2L = C 19H 20N 2O 4Br 2) ( 0) have been described. Crystal structure analysis of 1 and 2 revealed that they are isostructural and form discrete dinuclear units with dihedral angle between the O1Cu1O2 and O1Gd1/Tb1O2 planes equal to 2.5(1)° and 2.6(1)°, respectively. The variable-temperature and variable-field magnetic measurements indicate that the metal centers in 1 and 2 are ferromagnetically coupled ( J = 7.89 cm 1 for 1). Crystal and molecular structure of the Schiff base ligand ( 0) has been also reported. The complex formation changes the conformation of Schiff base ligand molecule.

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关键词：

Heterodinuclear complexes Schiff base Crystal structure Magnetic properties

DOI：

10.1016/j.ica.2011.09.017

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年份：

2011