1127351-30-7Relevant academic research and scientific papers
Synthesis and magnetic study of μ1,1-azido-bridged dinuclear manganese(II) complexes based on tripyridyl ligands
Yu, Ming-Ming,Ni, Zhong-Hai,Zhao, Chong-Chao,Cui, Ai-Li,Kou, Hui-Zhong
, p. 5670 - 5676 (2007)
Three azido-bridged MnII complexes of formulas [Mn 2(N3)4-(ttp)2] (1), [Mn 2(N3)4(ttp-N3)2] (2) and [Mn2(N3)4(ttp-N3)2] 3-[MnIII(ttp-N3)(N3) 3]2 (3), where ttp and ttp-N3 represent 4′-p-tolyl-2,2′:6′,2″-terpyridine and 4′-p-azidomethylphenyl-2,2′:6′,2″-terpyridine, were synthesized and characterized by single-crystal X-ray diffraction analysis and magnetic studies. The Mn ions in complexes 1 and 2 are coordinated by three N atoms of the ttp or ttp-N3 ligands, and they are connected by double end-on (EO) azide ligands; this forms a dinuclear MnII system with Mn-N-Mn bridging angles of 103.5 and 103.1°. The Br atoms of the -CH 2Br ligands were replaced by azido groups during the formation of complexes 2 and 3. The structure of complex 3 comprises two structurally similar MnII dimers with double end-on bridging azide groups and one mononuclear MnIII structure. The bridging Mn-N-Mn angles in 3 are 104.2, 105.1, and 106.73°. Magnetic studies indicate the presence of intramolecular ferromagnetic superexchange. The strength of ferromagnetic coupling within the Mn2 cores in 1-3 is dependent on the Mn-N-Mn bridging angles. The magnetic coupling constants for intermolecular exchange are 2.46(4), 2.25(2), and 1.92(4) cm-1 for 1, 2, and 3, respectively, on the basis of Hamiltonian H = -2JS1S2. Wiley-VCH Verlag GmbH & Co. KGaA, 2007.
