Weak Metamagnetic-like 1D Manganese(II) Complex with a Double 1,1-Azido Bridge: A Structure and Magnetic Study
详细信息 查看全文
- 作者：Anamika Das ; Georgina M. Rosair ; M. Salah El Fallah ; Joan Ribas ; and Samiran Mitra
- 刊名：Inorganic Chemistry
- 出版年：2006
- 出版时间：April 17, 2006
- 年：2006
- 卷：45
- 期：8
- 页码：3301 - 3306
- 全文大小：270K
- 年卷期：v.45,no.8(April 17, 2006)
- ISSN：1520-510X
文摘
The azido-bridged manganese complex of formula [Mn(tptz)(
1,1-N3)2]n [1; tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine]has been synthesized and characterized by single-crystal X-ray diffraction analysis and a low-temperature magneticstudy. The complex 1 crystallizes in the orthorhombic space group Pbcn, with a = 17.911(5) Å, b = 15.804(5) Å,c = 6.6538(18) Å, and Z = 4. The Mn atoms are coordinated by three N atoms of the tptz ligands and connectedto each other by double end-on (EO) azide ligands, forming a neutral 1D chain. The adjacent 1D chains areconnected by face-to-face 
--stacking interactions and C-H··· interactions of pyridine rings of the tptz ligands,which leads to the formation of a supramolecular 2D sheet structure. Temperature- and field-dependent magneticanalyses reveal dominant intrachain ferromagnetic interactions with EO azide-bridge and weak interchainantiferromagnetic interactions with overall metamagnetic behavior having 3D magnetic ordering at 2.7 K. The criticalfield is approximately 80 G, at which the interlayer antiferromagnetic ground-state switches to a ferromagneticstate.
1,1-N3)2]n [1; tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine]has been synthesized and characterized by single-crystal X-ray diffraction analysis and a low-temperature magneticstudy. The complex 1 crystallizes in the orthorhombic space group Pbcn, with a = 17.911(5) Å, b = 15.804(5) Å,c = 6.6538(18) Å, and Z = 4. The Mn atoms are coordinated by three N atoms of the tptz ligands and connectedto each other by double end-on (EO) azide ligands, forming a neutral 1D chain. The adjacent 1D chains areconnected by face-to-face --stacking interactions and C-H··· interactions of pyridine rings of the tptz ligands,which leads to the formation of a supramolecular 2D sheet structure. Temperature- and field-dependent magneticanalyses reveal dominant intrachain ferromagnetic interactions with EO azide-bridge and weak interchainantiferromagnetic interactions with overall metamagnetic behavior having 3D magnetic ordering at 2.7 K. The criticalfield is approximately 80 G, at which the interlayer antiferromagnetic ground-state switches to a ferromagneticstate.