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Issue 34, 2013
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Ligand dependent self-assembly of hydroxido-bridged dicopper units templated by sodium ion

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Abstract

Crown-ether like interaction of two neutral [Cu2(μ-OH)(μ-L1)] (H3L1 = 2-(2′-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine) fragments, around a central Na+ cation as self-assembly template, led to the formation of [Na{Cu2(μ-OH)(μ-L1)}2]ClO4 (1). Di-tert-butyl group substituted H3L2 {2-(3,5-di-tert-butyl-2-hydroxyphenyl)-1,3-bis[4-(3,5-di-tert-butyl-2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine} conversely yields only [Cu2(μ-OH)(μ-L2)]·1.5H2O (2), by discarding aggregation around the Na+ ion. The crown-ether type aggregate 1 exhibits ferromagnetic interactions within the double oxido-phenoxido [Cu2] fragments and weak antiferromagnetic interactions are mediated by the O⋯Na+⋯O bridges. Complex 2 registers only weak antiferromagnetic interactions within the oxido-phenoxido bridged [Cu2] entity. UV-visible and emission titration spectroscopy establish the interaction of cationic complex 1 with calf thymus DNA in Tris buffer and it cleaves supercoiled pBR322 DNA from in situ generated ROS.

Graphical abstract: Ligand dependent self-assembly of hydroxido-bridged dicopper units templated by sodium ion

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Supplementary files

Article information


Submitted
26 Apr 2013
Accepted
05 Jun 2013
First published
18 Jul 2013

Dalton Trans., 2013,42, 12495-12506
Article type
Paper

Ligand dependent self-assembly of hydroxido-bridged dicopper units templated by sodium ion

A. Sarkar, A. R. Paital, R. A. Khan, F. Arjmand, V. Bertolasi, C. Mathonière, R. Clérac and D. Ray, Dalton Trans., 2013, 42, 12495
DOI: 10.1039/C3DT51095F

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