Self-assembly of novel co-ordination polymers containing polycatenated molecular ladders and intertwined two-dimensional tilings
- 1 January 1999
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 11,p. 1799-1804
- https://doi.org/10.1039/a903107c
Abstract
Four novel co-ordination polymers have been obtained from the reactions of MII(NO3)2 salts (MII = Zn, Co or Cd) and the bidentate spacer ligands 1,2-bis(4-pyridyl)ethyne (bpethy) and trans-4,4′-azobis(pyridine) (azpy), all exhibiting the same metal-to-ligand molar ratio of 2∶3. Crystal structure analyses, however, have revealed two quite different polymeric motifs, in spite of the presence of similar co-ordination geometries of the metal ions, that are bound to three pyridyl groups, with a T-shaped disposition, and to the oxygen atoms of two η2-nitrates, thus resulting in a distorted pentagonal-bipyramidal seven-co-ordination. The species [M2(bpethy)3(NO3)4] (M = Zn or Co) consist of ladder-like polymers that interpenetrate in an unprecedented fashion to produce an overall three-dimensional array. On the other hand, the species [Cd2(bpethy)3(NO3)4]·CH2Cl2 and [Cd2(azpy)3(NO3)4] contain undulated two-dimensional layers with an unprecedented tiled pattern, that give threefold interpenetration in a parallel fashion.Keywords
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