- 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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Two 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) A, b = 7.584(2) A, c = 26.766(5) A, β = 91.87°, and Z = 2, whereas compound 2 crystallizes in the monoclinic system, C2/c group, a = 6.707(2) A, b = 17.188(5) A, c = 13.096(5) A, 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-).
- Escuer, Albert,Mautner, Franz A.,Sanz, Nuria,Vicente, Ramon
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