Abstract
A novel 3D cyano-bridged hybrid ferrimagnet { Mn 2 II ( imH ) 2 ( H 2 O ) 4 [ Nb IV ( CN ) 8 ] } · 4 H 2 O 1 (imH = imidazole) of T c = 25 K is reported. Its 3D inorganic –Nb–CN–Mn– framework is built of two groups of mutually parallel 1D-ladders cross-linked at niobium centers. Imidazole molecules reveal terminal coordination mode only. We discuss structural features in the context of 3D –Nb–CN–Mn– framework of 1, comparing it with that of { Mn 2 II ( pzdo ) ( H 2 O ) 4 [ Nb IV ( CN ) 8 ] } · 5 H 2 O 2 ferrimagnet with T c = 37 K reported by us [Inorg. Chem. 46 (2007) 10416]. The differences in T c are explained in respect to the metric parameters and positions of bridging linkages at [Nb(CN) 8] 4− polyhedra. Comparison of infrared spectra of 1 and free imH is also provided.
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