Abstract
The reaction in water of Cu(OH)2 with 2,2′-bipyridine (bipy) and (NH4)2HPO4 (4:4:2) in air leads to the formation of two structurally related complexes following the fixation of CO2: {[(H2O)2Cu4(bipy)4 (μ4-PO4)2(μ2- CO3)]·22.5H2O}, 1, and {[(H2O)2Cu4(bipy)4(μ4- PO4)2(μ2-CO3)]· 15.5H2O}, 1a, as determined by single crystal X-ray diffraction. Whilst each complex contains isostructural tetranuclear Cu(II) butterfly cores, they differ in the way they pack in the solid state: adjacent units in 1 align in parallel fashion, whereas those in 1a form H-bonded dimers in an antiparallel arrangement. 1 and 1a are therefore supramolecular isomers. 1 is encapsulated within an 'ice-like' 3D H-bonded water network whereas the solvent sheath about 1a forms a 2D H-bonded network. A similar product results when bipy is replaced with 1,10-phenanthroline (phen) giving {[(H2O)2 Cu4(phen)4(μ4-PO4)2 (μ2-CO3)]·21.5H2O}, 2, which possesses an isostructural butterfly core shrouded within a 3D H-bonded water network. 2 packs in the solid-state in a similar way to 1 although, in this instance, adjacent units align in an antiparallel fashion. Both 1 and 2 may be directly synthesised in higher yields when (NH4)HCO3 is included within the reaction medium. A magnetic susceptibility study performed upon 1 reveals net weak intramolecular antiferromagnetic coupling between the Cu(II) centres.
Original language | English (US) |
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Pages (from-to) | 4230-4237 |
Number of pages | 8 |
Journal | Dalton Transactions |
Issue number | 22 |
DOIs | |
State | Published - Nov 21 2003 |
Externally published | Yes |
ASJC Scopus subject areas
- Inorganic Chemistry