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Download fileWeak Metamagnetic-like 1D Manganese(II) Complex with a Double μ1,1-Azido Bridge: A Structure and Magnetic Study
journal contribution
posted on 2006-04-17, 00:00 authored by Anamika Das, Georgina M. Rosair, M. Salah El Fallah, Joan Ribas, Samiran MitraThe azido-bridged manganese complex of formula [Mn(tptz)(μ1,1-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 magnetic
study. 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 connected
to each other by double end-on (EO) azide ligands, forming a neutral 1D chain. The adjacent 1D chains are
connected by face-to-face π−π-stacking interactions and C−H···π interactions of pyridine rings of the tptz ligands,
which leads to the formation of a supramolecular 2D sheet structure. Temperature- and field-dependent magnetic
analyses reveal dominant intrachain ferromagnetic interactions with EO azide-bridge and weak interchain
antiferromagnetic interactions with overall metamagnetic behavior having 3D magnetic ordering at 2.7 K. The critical
field is approximately 80 G, at which the interlayer antiferromagnetic ground-state switches to a ferromagnetic
state.