Dinickel(II), dizinc(II) and dilead(II) complexes of a pyridazine- containing Schiff-base macrocycle

Carsten D. Brandt, Paul G. Plieger, Robert J. Kelly, Duncan J. De Geest, Dietmar K. Kennepohl, Simon S. Iremonger, Sally Brooker

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12 Citations (Scopus)


The preparation and structure of dinickel(II), dizinc(II) and dilead(II) complexes of this (2 + 2) macrocycle are described, along with the electrochemical behaviour of the dizinc(II) complex and attempts to explore the iron(II) coordination chemistry of L1. The study of the mid-late first row transition metal co-ordination chemistry of the pyridazine-containing Schiff-base macrocycle L1 [derived from the (2 + 2) condensation of 3,6-diformylpyridazine and 1,3-diaminopropane] has been completed. Transmetallation reactions of [Pb2(4 + 4)](ClO4) 4 (1) under appropriate conditions have led to the formation of the following complexes, [Ni2L1(NCS)2(SCN)2] (3), [{Pb2L1}23-OH)2](ClO 4)6 (4), and [Zn2L1(CH3CN) 4](ClO4)4 (5 • 4CH3CN), all of which have been structurally characterised. The analogous triflate salt of 5, [Zn2L1](CF3SO3)4 (6), can only be obtained by template reaction, as transmetallation of 1 with Zn(CF 3SO3)2 • 6H2O gave 5, albeit in reduced yield. Attempts to synthesise pure [Fe2L1(CH 3CN)4](ClO4)4 (7) using the transmetallation procedure, from either [Pb2(4 + 4)](ClO 4)4 or [Zn2L1(CH3CN) 4](ClO4)4, were unsuccessful. The electrochemical studies carried out on [Zn2L1](ClO4) 4 (5) revealed multiple reduction processes and associated oxidations, but no processes corresponding to oxidation of 5.

Original languageEnglish
Pages (from-to)4265-4272
Number of pages8
JournalInorganica Chimica Acta
Issue number14
Publication statusPublished - 15 Nov. 2004


  • Electrochemistry
  • Macrocycle
  • Pyridazine
  • Schiff base
  • Structure determination


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