Two MnII coordination polymers with a triazine-based polycarboxylate ligand: pH value influence, crystal structures and magnetic properties
摘要:
Two new coordination compounds, [Mn(HL)(H2O)(2)](n) (1) and {[Mn-12(L)(8)( H2O)(30)]center dot 10H(2)O}(n) (2) were successfully synthesized by using a hydrothermal technique under different pH values and characterized by single-crystal X-ray diffraction. 1 formed at lower pH value (6.0) exhibits 2D lamellar framework which is further connected by hydrogen-bond interactions to construct a 3D supramolecular architecture. Reaction at pH = 7.5 leads to a 2D layered structure of 2, which are formed through the interconnection of the dodecanuclear units and the completely depronated ligands. It is comprehensible that the pH value plays a crucial role in the formation of the resulting structures. Variable temperature magnetic studies down to 2 K reveal antiferromagnetic interactions in complexes 1 and 2. (C) 2012 Elsevier B.V. All rights reserved.
Two new coordination compounds, [Mn(HL)(H2O)(2)](n) (1) and [Mn-12(L)(8)( H2O)(30)]center dot 10H(2)O}(n) (2) were successfully synthesized by using a hydrothermal technique under different pH values and characterized by single-crystal X-ray diffraction. 1 formed at lower pH value (6.0) exhibits 2D lamellar framework which is further connected by hydrogen-bond interactions to construct a 3D supramolecular architecture. Reaction at pH = 7.5 leads to a 2D layered structure of 2, which are formed through the interconnection of the dodecanuclear units and the completely depronated ligands. It is comprehensible that the pH value plays a crucial role in the formation of the resulting structures. Variable temperature magnetic studies down to 2 K reveal antiferromagnetic interactions in complexes 1 and 2. (C) 2012 Elsevier B.V. All rights reserved.