Coordination Chemistry of Polynitriles, Part XI. Influence of 4,4 '-Bipyridine and Solvent on the Crystal and Molecular Structures of Alkaline Earth Pentacyanocyclopentadienides

Nimax, Patrick R. und Sünkel, Karlheinz (2022): Coordination Chemistry of Polynitriles, Part XI. Influence of 4,4 '-Bipyridine and Solvent on the Crystal and Molecular Structures of Alkaline Earth Pentacyanocyclopentadienides. In: Chemistry, Bd. 4, Nr. 4: S. 1524-1545

Abstract

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 = [C-5(CN)(5)](-)). Recrystallization from MeOH, EtOH, or n-BuOH gave crystals of [Mg(H2O)(4)(4,4'-bipy)(2)](PCC)(2)center dot 2BuOH (1), [Ca(H2O)(4)(4,4'-bipy)(2)](PCC)(2)center dot(4,4'-bipy) (2), [Sr(MeOH)(8)](PCC)(2)center dot 3(4,4'-bipy) (3), [Sr-2(H2O)(4)(BuOH)(4)(PCC)(2)(mu-PCC)(2) (mu-4,4'-bipy)]center dot 4 (4,4'-bipy)center dot 0.29 (BuOH) (4), [Ba-3(H2O)(4)(EtOH)(10) (PCC)(2)(mu-PCC)(2) (mu-4,4'-bipy)(2)(4,4'-bipy)](PCC)(2) center dot 3(4,4'-bipy)center dot 2EtOH center dot H2O (5) and [Ba-4(H2O)(8)(BuOH)(6) (PCC)(2)(mu-PCC)(6) (4,4'-bipy)(6)]center dot 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 pi-pi stacking is observed.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• Sprache: Englisch