Acta Cryst. (2002). E58, m206-m208  [ doi:10.1107/S1600536802006232 ]

Unexpected ring contraction in a dinuclear mercury(II) complex of a pendant-arm macrocyclic complex

S. Chantrapromma, H.-K. Fun, A. Usman, C. Karalai, W. Wongratchasee, C. Ponglimanont and S. Gou

Abstract: The [2+2] cyclocondensation reaction between sodium 2,6-diformyl-4-chlorophenolate and benzyldiethylenetriamine using the sodium template method, followed by transmetallation with Hg(CH₃COO)₂·2H₂O, gave an unexpected 18-membered macrocyclic product in which ring contractions have occurred to produce two imidazolidine rings. In the dinuclear macrocyclic complex, bis[-3,17-dibenzyl-3,6,9,17,20,23-hexaazatetracyclo[23.3.1.1^11,15.0^2,6.0^16,20]tricosa-1(29),9,11,13,15(30),23,25,27-octaene-29,30diolato]bis[diacetatomercury(II)] tetrahydrate diethanol solvate, [Hg₂(C₃₈H₃₈Cl₂N₆O₂)(CH₃COO)₄]·4H₂O·2CH₃CH₂OH, each Hg^II ion is coordinated by the imine N atom and O atom of the macrocyclic ligand and four O atoms from the acetate ligands, to form a centrosymmetric structure. The Hg coordination is irregular and it may be described as a distorted square pyramid.

Online 19 April 2002

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