Issue 36, 2015

Piperazine linked salicylaldoxime and salicylaldimine-based dicopper(ii) receptors for anions

Abstract

The syntheses and single crystal X-ray analyses of five strapped salicylaldoxime/salicylaldimine based dicopper(II) receptors utilising a new piperazine linker are described. The complexes 1–4 form 2 + 2 metallocycles and the molecular structures of all four complexes possess a small internal cavity with the utilisation of a short piperazine linker. The molecular structures of complexes [Cu2(L4 − H)(L4 − 2H) ⊂ DMF]BF4·DMF, 1 and [Cu2(L4 − H)2Br]Br·1.25DMSO·H2O·MeOH, 2 show that intramolecular H-bonding interactions due to the presence of –OH (oxime moiety) groups lead to a Pacman-like cleft arrangement of the two metal coordinating subunits in the metallo-macrocycle. The geometrical constraints brought about by this constrained cleft make the receptor coordinate strongly to a bromide anion involving both metal centres as evidenced by 2 whereas in 1 the larger tetrafluroborate anion is excluded. Absence of the oxime moiety around the metal coordination site of the ligand as demonstrated in the complexes [Cu2(L5)2BF4](BF4)3, 3 and [Cu2(L5)2Br]Br3·2MeOH, 4 resulted in less constrained dicopper(II) helicate forms. For these complexes no anion size discrimination was observed. The addition of pyridine solvent to a slightly modified piperazine-linked ligand produces an expanded 3 + 3 tube-like tricopper complex [Cu3(L4a − H)3Py3](BF4)2·(MeOH)3·PF6·(H2O)3, 5, with two coordinated pyridine molecules occupying the newly formed cavity.

Graphical abstract: Piperazine linked salicylaldoxime and salicylaldimine-based dicopper(ii) receptors for anions

Supplementary files

Article information

Article type
Paper
Submitted
06 Jul 2015
Accepted
11 Aug 2015
First published
11 Aug 2015

Dalton Trans., 2015,44, 15949-15959

Author version available

Piperazine linked salicylaldoxime and salicylaldimine-based dicopper(II) receptors for anions

D. N. T. De Silva, G. B. Jameson, A. P. S. Pannu, R. Pouhet, M. Wenzel and P. G. Plieger, Dalton Trans., 2015, 44, 15949 DOI: 10.1039/C5DT02551F

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