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Taylor and Francis Group, Supramolecular Chemistry, 1-2(19), p. 17-27, 2007

DOI: 10.1080/10610270600902340

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Synthesis and structures of 3,5-disubstituted 1,2,4-triazole head units and incorporation of 3,5-dibenzoyl-1,2,4-triazolate into new [2 + 2] schiff-base macrocyclic complexes

Journal article published in 2007 by Carsten D. Brandt, Jonathan A. Kitchen ORCID, Udo Beckmann, Nicholas G. White, Geoffrey B. Jameson, Sally Brooker ORCID
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

The synthesis and characterization of sodium 3,5-diacetyl- 1,2,4- triazolate (4 (Me)) and sodium 3,5-dibenzoyl-1,2,4- triazolate (4 (Ph)), both of which can be used as head unit building blocks in Schiff-base reactions, are reported. The crystal structures of sodium 3,5-diacetyl-1,2,4- triazolate, as [4 (Me)(H2O)]infinity, and sodium 3,5-dibenzoyl-1,2,4- triazolate, as [4 (Ph)(CH3OH)(2] 2), have been determined. The former is a helical polymer whilst the latter is a methanol-bridged dimer. The lead(II) templated cyclization reaction of sodium 3,5-dibenzoyl-1,2,4-triazolate (4 (Ph)) with 1,3-diaminopropane or 1,4-diaminobutane, respectively, leads to the formation of two new [ 2 + 2] Schiff-base macrocycles as their lead(II) complexes, [Pb2L (3Ph)(mu-OH)]ClO4 (5) and [Pb2L (4Ph)(mu-OH)] ClO4 ( 6), respectively. Transmetallation of 5 with nickel(II) ions yields a novel, structurally characterized, dinickel(II) macrocyclic complex, [Ni2L (3Ph)(NCS)(2)] ( 7), which features double triazolate bridging of the two five-coordinate nickel(II) ions.