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Keywords:

  • Cadmium;
  • Hydrazine;
  • Hydrazide;
  • X-ray diffraction;
  • NMR spectroscopy

Abstract

The synthesis of (Me2CdL)n [L = H2NN(H)tBu, n = 2 (1); L = H2NN(CH2CH2)2NMe, n = ∞ (2)] and the conversion of 2 to MeCdN(H)N(CH2CH2)2NMe (4) are reported. In the solid state, 1 is a dimer in which each H2NN(H)tBu bridges two metal centres to generate discrete, isolated Cd2N4 rings, whereas 2 is a 1D polymer in which Me2Cd units are bridged by H2N and MeN moieties; the chains in 2 are further reinforced by NH···N hydrogen bonds. Hydrazide 4 is tetrameric and isostructural with the known aminomorpholine analogue; it forms a Cd4N8 cage structure that embodies both five-membered Cd2N3 and six-membered Cd2N4 rings. In addition to X-ray crystallography, 1, 2 and 4 have been characterised by 1H, 13C, and 113Cd NMR spectroscopy.