Unsymmetrically substituted triazacyclohexanes and their chromium complexes

S Latreche, A Mousser, Gabriele Kociok-Kohn, Randolf D Kohn, F Schaper

Research output: Contribution to journalArticle

Abstract

The unsymmetrically N-substituted N,N'-Ar-2-N ''-R-1,3,5-triazacyclohexanes 1-4 (Ar = ortho- or parr,fluorophenyl, R = n- or iso-propyl) can be obtained in good yields from a one-step condensation reaction with excess amine. Solid state structures of 1-4 resemble closely those of their triaryl-substituted analogues. The condensation reaction to 4 was looked at by detailed NMR investigations and revealed that amine/aniline exchange is occurring in solutions containing free aniline even at ambient conditions setting up an equilibrium between all possible symmetrical and unsymmetrical triazacylcohexanes. Selective crystallisation of 4 from the solution drives the reaction to high yields of 4. Complexes 1-4 react readily with CrCl3 or CrCl3(THF)(3) to form the corresponding CrCl3 complexes. The complexes are insoluble in non-polar solvents and decompose under decomplexation in coordinating solvents.
Original languageEnglish
Pages (from-to)1399-1404
Number of pages6
JournalPolyhedron
Volume29
Issue number5
Early online date28 Jan 2009
DOIs
Publication statusPublished - 30 Mar 2010

Keywords

  • chromium(III)
  • triazacyclohexane
  • selective crystallisation
  • chromium complexes

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