157592-76-2Relevant academic research and scientific papers
Five new pseudohalide bridged Mn(II) complexes of pyrimidine derived Schiff base ligands: Synthesis, crystal structures and magnetic properties
Ray, Sangita,Konar, Saugata,Jana, Atanu,Dhara, Anamika,Das, Kinsuk,Chatterjee, Sudipta,El Fallah, Mohamed Salah,Ribas, Joan,Kar, Susanta Kumar
, p. 212 - 221 (2014)
Four new azide bridged dinuclear Mn(II) complexes [Mn(L1) (μ1,1-N3)(N3)]2 (1), [Mn(L 2)(μ1,1-N3)(N3)]2 (3), [Mn(L3)(μ1,1-N3)(N3)] 2[(N3)Mn(L3)(μ1,1-N 3)(N3)]2 (4) and [Mn(L4)(μ 1,1-N3)(N3)]2[Mn(L 4)(μ1,1-N3)(N3)]2 (5) and one new dicynamide bridged binuclear Mn(II) complex {[Mn2(L 1)2(dca)2(H2O)2(μ 1,5-dca)](ClO4)} (2) have been synthesized using the pyrimidine derived primary Schiff base ligands Ln (n = 1-4), with azide and dicynamide as bridging ligands. All the five complexes were characterized by elemental analyses, IR spectroscopy and single crystal X-ray crystallography, together with magnetic measurements of 1-4. The tridentate Schiff base ligands are the [1 + 1] condensation products of 2-hydrazino-4,6-dimethyl pyrimidine with 2-acetyl pyridine, pyridine-2- carbaldehyde, 2-benzoyl pyridine and di(2-pyridyl) ketone for Ln (n = 1-4), respectively. All the complexes except 2 contain Mn(II)-azido links in which the Mn(II) centres are bridged by a di-μ1,1-azido (double EO) group. The double EO bridging fragments in the complexes are similar with bridging angles (Mn-N-Mn) ranging from 102.59 to 104.81. Magnetic property studies reveal that in 1, 3 and 4 intramolecular ferromagnetic interactions are mediated through the EO azido bridges with J parameters in the range 4.3-5.12 cm-1, while a weak antiferromagnetic interaction prevails in 2 (J = -0.12 cm-1) via μ1,5-dicynamide bridges. In addition, complexes 1, 3 and 4 show weak intermolecular antiferromagnetic interactions (J = -0.025 to -0.027 cm-1).
