Coordination Polymers of Silver(I) with Ditopic Cross-Conjugated Dienoneстатья
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Дата последнего поиска статьи во внешних источниках: 26 декабря 2017 г.
Аннотация:The reaction of the silver salts AgX (a: X = b: X = c: X = OTf–) with α,α'-di(3/4-pyridylmethylene)
cycloalkanones (L1–L3) and piperidones (L4–L7) results in the formation of coordination products of
general composition [AgX(Ln)(solvent)] and [AgX(Ln)] (Ln = L1–L7). All complexes were characterized by elemental
analysis and IR-spectroscopy. The structures of [Ag(ClO4)(L1)(MeC≡N)]∞ (1b·MeC≡N) and
[Ag(ClO4)(L1)]∞ (1b) in the solid state are reported. In both structures {Ag(L1)}+ building units are linked to each
other via Ag–Npyridine primary bonds resulting in the formation of infinite chains. In both structures the ligands L1
are fixed in transoid conformations, thus forming zig-zag polar chains. The structure of 1b·MeC≡N consists of
pairs of tightly and loosely stacked chains. The tightly packed chains are weakly coupled by perchlorate anions acting
as μ-bridges in between Ag(I) centers as well as by π–π-stacking interactions of unsaturated fragments of the
respective ligands. In contrast, polar 2D layers composed of chains, which interdigitate via multiple
weak interactions by Ag–O contacts, are found in the solid structure of 1b. The dissolution of coordination products
in coordinating solvents like MeCN or DMSO leads to the decomposition of complexes due to formation of
silver-solvent coordination compounds. The coordination products 1–5 are stable in solid state against exposure
to the ambient light, whereas solutions of the compounds, especially in DMSO-d6, appeared to be photochemically
labile. As revealed by NMR spectroscopic studies, the organic components undergo trans-cis isomerization.