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Updated: Aug 23, 2026
Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
Published on: December 16, 2013
Structural consequences of the prohibition of hydrogen bonding in copper-guanidine systems
Sarah H Oakley1, Martyn P Coles, Peter B Hitchcock
1Department of Chemistry, University of Sussex, Falmer, Brighton BN1 9QJ, U.K.
Abstract:
The synthesis and structure of copper(I) complexes supported by N-substituted bicyclic guanidines is described. The N-methyl-substituted bicyclic guanidine 1,3,4,6,7,8-hexahydro-1-methyl-2H-pyrimido[1,2-a]pyrimidine (hppMe) reacted with copper(I) chloride to afford the ion-pair [Cu(hppMe)(2)][CuCl(2)] (1), a rare example of a compound containing an unsupported Cu...Cu interaction. The analogous reaction with CuI, however, afforded the molecular mu,mu-dihalo-bridged dimer [CuI(hppMe)](2) (2). Inclusion of a trimethylsilyl substituent at nitrogen provided a sufficiently sterically encumbered environment to support a two coordinate copper center in CuCl(hppSiMe(3)) (3). Compounds 1-3 have been fully characterized, including single-crystal X-ray diffraction studies.
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