Aggregation of complexes coordinated with N,N'-bis(5-alkylsalicylidene)ethylenediamine: 1H NMR peak shifts and paramagnetic broadening investigations.

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概要

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• Nickel(II) complexes coordinated with <I>N</I>,<I>N</I>′-disalicylideneethylenediamine (salen) substituted by a series of <I>n</I>-alkyl side chains have been synthesized. Drastic improvement in the solubility towards chloroform brought about by the increase in alkyl side chain lengths realised an extremely high concentration of 0.5 mol·dm<SUP>−3</SUP>. Due to aggregation, their <SUP>1</SUP>H NMR spectra in CDCl<SUB>3</SUB> were strongly dependent on the concentration especially in the high concentration region. The alkyl chain length has very little influence on the dependency, indicating that the aggregation is caused by the complex–complex interaction rather than by the hydrophobic interaction between the alkyl side chains. Assuming a monomer–dimer equilibrium, the aggregation constant is determined from the concentration dependence. Further, the structure of the aggregate is estimated by combining the results of the concentration dependence, and the paramagnetic broadening caused by adding the corresponding copper(II) complex. The paramagnetic broadening investigation also indicated a close contact of copper(II) complex to nickel(II) complex.

• 公益社団法人 日本化学会の論文

著者

• Gohshi Yohichi

  Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo

関連論文

• Aggregation of complexes coordinated with N,N'-bis(5-alkylsalicylidene)ethylenediamine: 1H NMR peak shifts and paramagnetic broadening investigations.

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