Synthesis, crystal structure and solution properties of a diastereomeric (p-cymene)ruthenium(II) chiral Schiff base complex

被引:19
作者
Rath, RK [1 ]
Nethaji, M [1 ]
Chakravarty, AR [1 ]
机构
[1] Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India
关键词
arene ruthenium; absolute configuration; crystal structures; CH-pi interaction; 2D NMR;
D O I
10.1016/S0277-5387(02)01104-X
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The reaction of [Ru(eta(6)-p-cymene)Cl-2](2) with the chiral Schiff base (S)-(alpha-methylbenzyl)-3,5-di-t-butylsalicylaldimine (HL*) in the presence of NEt3 in CH2Cl2, forms a diastereomeric mixture of (R-Ru, S-C)- and (S-Ru , S-C)-[Ru(eta(6)-p-cymene)(L*)Cl] (1a, 1b). The crystal structure of the complex shows the presence of both the diastereomers in 1:1 ratio in the triclinic space group P1. Both the structures exhibit the presence of a non-covalent CH-pi interaction involving two p-cymene ring protons and the phenyl group attached to the chiral carbon. The H-1 NMR spectra of the complex in CDCl3 display the presence of two diastereomers in a 88:12 ratio at room temperature. The absolute configuration of the major diastereomer in solution has been determined by 2D NOE measurements. Observation of NOE cross peaks involving the C*-H and the p-cymene ring protons indicates a (R-Ru - S-C)configuration of the major diastereomer in solution. (C) 2002 Elsevier Science Ltd. All rights reserved.
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页码:1929 / 1934
页数:6
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