| Автор | Telfer, Shane G. |
| Автор | Bernardinelli, Gérald |
| Автор | Williams, Alan F. |
| Дата выпуска | 2003 |
| dc.description | The syntheses and coordination chemistry of 5,5â ²-di(methylene-N-aminoacidyl)-2,2â ²-bipyridyl ligands, where the amino acid is valine (1) or alanine (2), are presented. Complexes [M(1)3]<sup>n+</sup>, where M = Co(ii), Co(iii) and Fe(ii), form diastereoselectively when the amine group of the amino acid arm is protonated. At higher pH the diastereoselectivity drops significantly. The solid state structure of [Co<sup>III</sup>(1H2)3]Cl2(ClO4)7 was determined by X-ray crystallography. Two chloride ions were found to be encapsulated by the amino acid arms of the complex via electrostatic attractions and hydrogen bonding to the protonated amine groups, as seen previously for the Fe(ii) complex. No anion binding was detected in aqueous solution, but complexes [Fe<sup>II</sup>(1H2)2(1H)]<sup>7+</sup> and [Co<sup>III</sup>(1H2)3]<sup>9+</sup> bind chloride ions in CD3OD with binding constants of 60(4) and 24(2) M<sup>â 1</sup> respectively, as determined by <sup>1</sup>H NMR spectroscopy. <sup>1</sup>H NMR spectroscopy suggests considerable conformational change of the ligand sidearms upon chloride binding. Complexes [Fe<sup>II</sup>(2)3]<sup>2+</sup> and [Co<sup>II</sup>(2)3]<sup>2+</sup> are formed with d.e.'s of 33 and 56% respectively. |
| Формат | application.pdf |
| Издатель | Royal Society of Chemistry |
| Название | Iron and cobalt complexes of 5,5′-di(methylene-N-aminoacidyl)-2,2′-bipyridyl ligands: ligand design for diastereoselectivity and anion bindingElectronic supplementary information (ESI) available: 1H NMR spectrum of [Co(1)3]3+ as a function of pH; 2D NOESY 1H NMR spectrum of [Co(1)3Cl2]+; 2D ROESY 1H NMR spectrum of [Co(1)3]3+. See http://www.rsc.org/suppdata/dt/b2/b208934c/ |
| Тип | research-article |
| DOI | 10.1039/b208934c |
| Electronic ISSN | 1477-9234 |
| Print ISSN | 1477-9226 |
| Журнал | Dalton Transactions |
| Первая страница | 435 |
| Последняя страница | 440 |
| Аффилиация | Telfer Shane G.; Département de Chimie Minérale, Analytique et Appliquée, Université de Genève, 30 quai Ernest Ansermet |
| Аффилиация | Bernardinelli Gérald; Laboratoire de Cristallographie aux Rayons-X, Université de Genève, 24 quai Ernest Ansermet |
| Аффилиация | Williams Alan F.; Département de Chimie Minérale, Analytique et Appliquée, Université de Genève, 30 quai Ernest Ansermet |
| Выпуск | 3 |
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