SARKAR, Avijit; RANJAN PAITAL, Alok; AHMAD KHAN, Rais; ARJMAND, Farukh; BERTOLASI, Valerio; MATHONIÈRE, Corine; CLÉRAC, Rodolphe; RAY, Debashis

doi:10.1039/c3dt51095f

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SARKAR, Avijit
Department of Chemistry, Indian Institute of Technology

RANJAN PAITAL, Alok
Department of Chemistry, Indian Institute of Technology

AHMAD KHAN, Rais
Department of Chemistry, Aligarh Muslim University

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Dalton Transactions. 2013, vol. 42, p. pp. 12495-12506

Royal Society of Chemistry

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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 centralNa+ 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 oxidophenoxido [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.< Leer menos

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Antiferromagnetic interactions

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

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