Structural diversity of complexes between Cu(II) or Ni(II) and endocyclic oxygen- or nitrogen-containing ligands: synthesis, X-ray structure determinations and circular dichroism spectra

Fainerman-Melnikova, Marina, Clegg, Jack K., Pakchung, Amalie A. H., Jensen, Paul and Codd, Rachel (2010) Structural diversity of complexes between Cu(II) or Ni(II) and endocyclic oxygen- or nitrogen-containing ligands: synthesis, X-ray structure determinations and circular dichroism spectra. CrystEngComm, 12 12: 4217-4225. doi:10.1039/c0ce00323a


Author Fainerman-Melnikova, Marina
Clegg, Jack K.
Pakchung, Amalie A. H.
Jensen, Paul
Codd, Rachel
Title Structural diversity of complexes between Cu(II) or Ni(II) and endocyclic oxygen- or nitrogen-containing ligands: synthesis, X-ray structure determinations and circular dichroism spectra
Journal name CrystEngComm   Check publisher's open access policy
ISSN 1466-8033
Publication date 2010-01
Sub-type Article (original research)
DOI 10.1039/c0ce00323a
Open Access Status Not Open Access
Volume 12
Issue 12
Start page 4217
End page 4225
Total pages 9
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Formatted abstract
Complexes between Cu(ii) or Ni(ii) and O- or N-containing ligands, pyridine-2,6-dicarboxylic acid (H 2L 1), 4-pyranone-2,6-dicarboxylic acid (H 2L 2), 4H-pyran-2,6-dicarboxylic acid (H 2L 3), (S)-tetrahydro-2-furoic acid (S-HL 4), 2,2′-bipyridine (L 5), 1,10-phenanthroline (L 6) or bis(2-pyridylmethyl)amine (L 7), have been synthesised and characterised by X-ray crystallography. In the ionic complex [Cu(H 2L 1)(L 5)(OH 2)]·[Cu(L 1) 2] ·3H 2O (1), one L 1 group and L 5 are close to parallel, which is not the case for the dimeric complex [Cu 2(HL 1) 2(L 1)(L 6)] ·5.5H 2O (2), in which the HL 1 groups on each Cu(ii) centre are bent inwards at an angle of 11°. The complex {[Cu(HL 3)(L 3) 0.5(OH 2)]·1.75H 2O} n (3) shows a paddle-wheel arrangement. In {[Cu(S-L 4)(L 7)]ClO 4} n (S-4), coordination occurs via the endocyclic O atom and the pendant carboxylic acid group and supports binding modes posited previously for complexes formed in solution between Cu(ii) and N-acetylneuraminic acid (sialic acid). The CD spectrum of S-4 (670 nm, -4.8 mdeg; 550 nm, +1.4 mdeg) is equal and opposite to its enantiomer {[Cu(R-L 4)(L 7)]ClO 4} n (R-4). Complexes between Cu(ii) or Ni(ii) and H 2L 2 show a 1-dimensional coordination polymer in [Cu(L 2)(OH 2) 4] n (5) and a discrete complex in [Ni(HL 2) 2(OH 2) 4] (6). Complexes 1-6 exhibited a range of coordination geometries, nuclearities, chiralities and polymeric architectures, which suggest that the interactions between Cu(ii) or Ni(ii) and endocyclic O- or N-containing bioligands in chemical biology settings will be varied.
Keyword Crystal structure
Copper(ii) complexes
Magnetic properties
Pyridine-2,6 dicarboxylate
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes First published on the web 02 August 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemistry and Molecular Biosciences
 
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