Barium templating Schiff-base lateral macrobicycles

被引:37
作者
Esteban, D
Bañobre, D
Bastida, R
de Blas, A
Macías, A
Rodríguez, A
Rodríguez-Blas, T
Fenton, DE
Adams, H
Mahía, J
机构
[1] Univ A Coruna, Dept Quim Fundamental & Ind, La Coruna 15071, Spain
[2] Univ Santiago, Dept Quim Inorgan, Santiago De Compostela 15706, Spain
[3] Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England
[4] Univ A Coruna, Serv Xerias de Apoio, La Coruna 15071, Spain
[5] Univ A Coruna, Serv Invest, La Coruna 15071, Spain
关键词
D O I
10.1021/ic9811190
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Schiff-base lateral macrobicycles containing two different binding units, a rigid and unsaturated N2X set (X: N, O) and a flexible and cyclic N2On set, linked by two aromatic bridges, have been prepared by reaction of the appropriate bibracchial diamines N,N-bis(aminobenzyl)-diaza-crown and diformyl precursors in the presence of Ba(II) as templating agent. The expected cryptands do not form in the absence of the cation; the presence of this metal ion is necessary to orient the diamine precursor in a syn conformation. Comparison of the X-ray crystal structures of the barium complex of the bibracchial diamine N,N'-bis(2-aminobenzyl)- 1,10-diaza-15-crown-5 and the barium complex of the cryptand derived from it incorporating a pyridine unit indicates that the encapsulation of the metal ion is clearly more effective in the case of the cryptand. The coordination of Ba(II) ion to the pyridine nitrogen atom promotes the displacement of the metal into the cavity of the cryptand as well as important changes in the conformation of the crown unit, although the fold of the pendant arms remains practically unchanged. The cryptands reported constitute the first example of a novel family of macrobicycles.
引用
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页码:1937 / 1944
页数:8
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