A new Wells–Dawson organic–inorganic hybrid polytungstate containing dimeric silver coordination complexes: (Hpy)2[Ag2(phen)4]2(P2W18O62)
An attempt to incorporate Ag+ ions and some organic-reducing ingredients (e.g. pyridine) simultaneously into a polyoxometalate is a challenging task due to the high-standard reduction potential of Ag+ ions. By using a second organic ligand to coordinate Ag+
first, we prepared a new polytungstate, (Hpy)2[Ag2(phen)4]2(P2W18O62) (1) (py = pyridine (C5NH5), phen = 1,10-phenanthroline (C12N2H8)),
which contains discrete inorganic polyanions ([P2W18O62]6–), protonated pyridine molecules, and [Ag2(phen)4]2+ dimers. The isolated inorganic polyanions cluster close to the planes of (1 0 0) and
are bound together by pyridine molecules via hydrogen bonds to form layers parallel to (1 0 0) at (0, y, z) and (0.5, y, z). The [Ag2(phen)4]2+ dimers are located between successive layers of (1 0 0) and
represent an uncommon feature that the hexagonal benzene rings of phen molecules are directly overlapped face to face. Our work opens a new way for synthesis of other Wells–Dawson organic–inorganic hybrid polytungstates by controlling reactant addition order.
Keywords: Hybrid polyoxometalate; Hydrothermal synthesis; Polytungstate; Silver (Ag+) ions; Wells–Dawson structure
Document Type: Research Article
Affiliations: 1: College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, PR China 2: College of Chemistry and Material Science, Longyan University, Longyan, PR China
Publication date: 03 August 2014
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