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Two New One-Dimensional Compounds with End-to-End Dicyanamide as a Bridging Ligand: Syntheses and Structural Characterization of trans-[Mn(4-bzpy)2(N(CN)2)2]n and cis-[Mn(Bpy)(N(CN)2)2]n, (4-bzpy = 4-benzoylpyridine; bpy = 2,2‘-bipyridyl)
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posted on 2000-03-25, 00:00 authored by Albert Escuer, Franz A. Mautner, Núria Sanz, Ramon VicenteTwo new one-dimensional compounds, trans-[Mn(4-bzpy)2(N(CN)2)2]n (1) and cis-[Mn(bpy)(N(CN)2)2]n (2), have
been synthesized and studied from a magnetic point of view (4-bzpy = 4-benzoylpyridine; bpy = 2,2‘-bipyridyl).
The crystal structures of 1 and 2 have been solved. Compound 1 crystallizes in the monoclinic system, P21/n
group, a = 6.374(2) Å, b = 7.584(2) Å, c = 26.766(5) Å, β = 91.87°, and Z = 2, whereas compound 2 crystallizes
in the monoclinic system, C2/c group, a = 6.707(2) Å, b = 17.188(5) Å, c = 13.096(5) Å, β = 90.54°, and Z
= 4. The two compounds consist of chains with double μ1,5-dicyanamide bridges between neighboring
manganese(II) atoms. The weak antiferromagnetic coupling found for the two compounds (J = −0.3 cm-1 for 1
and −0.4 cm-1 for 2) has been studied by MO analysis, and the superexchange pathway through the μ1,5-(NCNCN-)
bridge has been compared with the shorter μ1,3-(NNN-).
