Coordination Chemistry of Polynitriles, Part XI. Influence of 4,4'-Bipyridine and Solvent on the Crystal and Molecular Structures of Alkaline Earth Pentacyanocyclopentadienides by Patrick R. Nimax & Karlheinz Sünkel

Author:Patrick R. Nimax & Karlheinz Sünkel
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Tags: The reaction of alkaline earth pentacyanocyclopentadienides with 4,4'-bipyridine in MeOH yielded undefined products of composition [M(PCC)2(Bipy)x(MeOH)y(H2O)z] (PCC = [C5(CN)5]-). Recrystallization from MeOH, EtOH, or n-BuOH gave crystals of [Mg(H2O)4(4,4'-bipy)2](PCC)22BuOH (1), [Ca(H2O)4(4,4'-bipy)2](PCC)2(4,4'-bipy) (2), [Sr(MeOH)8](PCC)23(4,4'-bipy) (3), [Sr2(H2O)4 (BuOH)4(PCC)2(-PCC)2 (-4,4'-bipy)]4 (4,4'-bipy)0.29 (BuOH) (4), [Ba3(H2O)4(EtOH)10 (PCC)2(-PCC)2 (-4,4'-bipy)2(4,4'-bipy)](PCC)2 3(4,4'-bipy)2EtOHH2O (5) and [Ba4(H2O)8(BuOH)6 (PCC)2(-PCC)6 (4,4'-bipy)6]3(4,4'-bipy) (6). 4,4'-Bipyridine functions either as monodentate or bidentate ligand and is present in all cases except for 2 as lattice guest. While in compounds 1 and 2 only water is present as O-donor, the alcohol coordinates in the other compounds either exclusively (3) or together with water (4–6). The pentacyanocyclopentadienide does not coordinate in 1–3, but is present as mono-, bi-, or tridentate ligand in 4–6. In all compounds, a more or less complicated interplay of hydrogen bridges and – stacking is observed., polynitrile anions; 4, 4'-bipyridine; pentacyanocyclopentadienide; alkaline-earth metal; coordination polymer; hydrogen bonding; – interactions


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