Magnetic dynamics of two salen type Dy2 complexes modulated by coordination geometry

Abstract

Two salen type dinuclear dysprosium complexes, namely [Dy(H₂L) (NO₃)₃]₂·CH₂Cl₂·CH₃OH·H₂O (1) and [Dy(H₂L¹)₂(NO₃)₃]₂·2CH₂Cl₂·2CH₃OH (2) [H₂L = N,N′-(1,3-propylene)bis(3-methoxysalicylideneimine) and H₂L¹ = N,N′-(1,3-propylene)bis(salicylideneimine)], were isolated from the reactions of Dy(NO₃)₃·6H₂O with two different but similar salen type ligands (H₂L and H₂L¹), respectively. X-ray crystallographic analyses revealed that two crystallographically equivalent Dy(III) ions for 1 and two crystallographically non-equivalent Dy(III) ions for 2 were both bridged by two ligands displaying broken hula hoop-like and hula hoop-like coordination geometries for complexes 1 and 2, respectively, which resulted in the distinct magnetic properties that complex 2 exhibited with relatively higher energy barriers under a 2 kOe dc field.