Synthesis and structure of a series of lanthanide(III) thiocyanate derivatives with THF, [Ln(NCS)3(THF)4]
The thiocyanate complexes Ln(NCS) 3 . (THF) 4 (Ln = Nd, Eu and Er) have been prepared and their structure was studied in the solid state by X-ray diffractometric methods. They crystallize in the monoclinic space group P2 1 /a with a ranging from 19.279(9) for Nd to 18.980(9) A for Er; b, c and β have almost constant values: b = 8.11 +/- 0.01 A, c = 17.68 +/- 0.05 A and β = 111.0 +/- 0.03 o . A peculiar feature of these complexes is the octa-coordination, the dimeric nature and the fact that in the molecule the NCS groups are coordinated as mono (Ln@?NCS) and bidentate (Ln@?NCS@?LN) ligands. The structural units assume an almost undistorted square antiprismatic coordination geometry; they are linked through bridges of NCS groups. The Ln ... S distances range from 3.10 (Nd) to 3.26 A (Er); these values correspond to rather weak bond interactions, but are unambiguously recognized as coordinating values in geometrical terms.
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