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- W1972555109 abstract "The bis-bidentate ligand R , S -1,2-diphenyl- N , N' -bis(2-quinolinemethylidene)ethane-1,2-diamine (ligand 4 ), containing two (iminomethyl)quinoline moieties separated by a cis -1,2-diphenylethylene spacer, forms stable complexes with both Cu I and Cu II . With Cu II , the monomeric 1:1 complex [Cu II ( 4 )] 2+ is obtained both in CH 3 CN and CH 2 Cl 2 . With Cu I and overall 1:1 metal/ligand molar ratio, an equilibrium mixture is obtained in CH 3 CN, consisting of [Cu I ( 4 ) 2 ] + , [Cu I 2 ( 4 ) 2 ] 2+ and [Cu I 2 ( 4 )(CH 3 CN) 4 ] 2+ . The preponderant species is the two-metal one-ligand open complex [Cu I 2 ( 4 )(CH 3 CN) 4 ] 2+ , in which each Cu + cation is coordinated in a tetrahedral fashion by one (iminomethyl)quinoline unit and by two CH 3 CN molecules. Precipitation from the equilibrium mixture yields only crystals of [Cu I 2 ( 4 )(CH 3 CN) 4 ](ClO 4 ) 2 ·2CH 3 CN, whose crystal and molecular structures have been determined. On the other hand, in the poorly coordinating CH 2 Cl 2 solvent, only the dimeric helical [Cu I 2 ( 4 ) 2 ] 2+ complex is obtained, when the overall metal/ligand 1:1 molar ratio is chosen. Addition of large quantities of acetonitrile to solutions of [Cu I 2 ( 4 ) 2 ] 2+ in dichlorometane results in the formation of [Cu I 2 ( 4 )(CH 3 CN) 4 ] 2+ , i.e. in the solvent-driven disassembling of the Cu I helicate. While electrochemistry in CH 3 CN is poorly defined due to the presence of more than one Cu I species, cyclic voltammetry experiments carried out in CH 2 Cl 2 revealed a well defined behavior, with irreversible oxidation of [Cu I 2 ( 4 ) 2 ] 2+ and irreversible reduction of [Cu II ( 4 )] 2+ taking place at separate potentials (∆ E ≈ 700 mV). Irreversibility and separation of the redox events are due to the self-assembling and disassembling processes following the reduction and oxidation, respectively." @default.
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- W1972555109 date "2003-01-01" @default.
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- W1972555109 title "A Solvent-Dependent and Electrochemically Controlled Self-Assembling/Disassembling System" @default.
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- W1972555109 doi "https://doi.org/10.1135/cccc20031647" @default.
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