Dalton Transactions p. 2054 - 2060 (2008)
Update date:2022-08-11
Topics:
Szeto, Kai C.
Kongshaug, Kjell Ove
Jakobsen, Soren
Tilset, Mats
Lillerud, Karl Petter
The heterobimetallic metal-organic framework {[(BPDC)PtCl2] 3(Gd(H2O)3)2}?5H2O (BPDC = 2,2′-bipyridine-5,5′-dicarboxylate) has been designed and synthesized by hydrothermal methods. The new coordination polymer contains subunits of (BPDC)PtCl2 (1) where both N atoms of the BPDC ligand are attached to a square-planar Pt(ii) center. The two remaining cis coordination sites at Pt(ii) are occupied by chloride ions. The final structure (2) of the polymeric network is obtained when Gd(iii) ions link together the (BPDC)PtCl2 units, which are organized in sheets, into larger blocks. These blocks are stacked along the crystallographic [010] direction and are held together by a hydrogen bonding scheme that involves carboxylate oxygen atoms and water molecules in the coordination sphere of Gd. The coordination polymer 2 can be obtained in a single-step reaction or in a two-step synthesis where the corresponding Pt complex (1) was first synthesized followed by reacting 1 with Gd(NO3)3?6H2O. In situ high temperature powder X-ray diffraction shows that the crystalline coordination polymer transforms into an anhydrous modification at 100 °C. This modification is stable to 350 °C, at which temperature the structure starts to decompose. The coordination sphere around platinum in the polymer closely resembles organometallic Pt complexes that have been previously found to catalytically or stoichiometrically activate and functionalize hydrocarbon C-H bonds in homogeneous systems. The Royal Society of Chemistry.
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