Synthesis, crystal structure and properties of N-tert-butyliminodiacetic acid (H(2)TEBIDA), [Cu(TEBIDA)(H2O)(2)], {[Cu(TEBIDA)(Him)]center dot 2H(2)O}(n), {Cu(TEBIDA) (5MeHim)center dot H2O}(n), and [Cu(TEBIDA)(2,2 '-bipy)(H2O]center dot 4.5H(2)O, (H

• 全文链接
• 请求原文

作   者：

Rojas-Gonzalez PX.;  Choquesillo-Lazarte D.;  Gonzalez-Perez JM. Ruiz-Garcia SA.;  Carballo R.;  Castineiras A.;  Niclos-Gutierrez J.; 

关键词：

pi-stacking;  Monohydrate;  Imidazole;  Bipyridine;  Aromatic pi;  Ligand copper(ii) complexes;  Iminodiacetato;  Copper(ii) complexes;  Iminodiacetate;  Crystal structure;  Dihydrate; 

期刊名称：

Polyhedron: The International Journal for Inorganic and Organometallic Chemistry

i s s n：

0277-5387

年卷期：

2003 年 22 卷 8 期

页   码：

1027-1037

页   码：

摘   要：

N-tert-butyliminodiacetic acid (H(2)TEBIDA, compound 1) has been prepared and characterised by thermogravimetric analysis, FT-IR and NMR spectra, and X-ray crystallography (final R-1 = 0.04). The zwitterion H(2)TEBIDA(+/-) is intra-stabilised by a hydrogen bond, and H-bonded chains of zwitterions form supramolecular 2D bilayers with tert-Bu groups towards the external faces. Compounds [Cu(TEBIDA)(H2O)(2)] (2), {[Cu(TEBIDA)(Him)].2H(2)O}, (3) {[Cu(TEBIDA)(5MeHim).H2O}(n) (4) [Cu(TEBIDA)(bipy)].4.5H(2)O (5) were also obtained and studied by thermal, (FT-IR, reflectance and ESR) spectral, magnetic and X-ray diffraction methods. Compound 2 has a molecular structure and TEBIDA with mer-NO2 tridentate conformation in contrast with that reported for {[Cu(IDA)(H2O)(2)]}(n) (polymeric chains, elongated octahedral Cu(II) coordination and fac-NO+ O(apical) IDA conformation). Compounds 3 and 4 form zig-zag polymeric chains and follow all structural co-relations reported for complexes with equimolar Cu(II)/iminodiacetato (IDA)/N-heterocyclic donor ratio (Cu(II) coordination type 4+1, mer-NO2 TEBIDA conformation and N(Him-like) donor in trans to the Cu-IDA-like bond). However, compound 5 has an unexpected fac-O-2+N(apical) TEBIDA conformation, with the aqua ligand (instead of one N-heterocyclic donor) in the trans-site of the Cu-N(IDA-like) bond, in contrast with structural co-relations for complexes with Cu/(IDA or IDA-like)/N-heterocyclic donor ratio 1/1/2 and closely related compounds (fac-NO + O(apical) IDA-like conformation and one N-heterocyclic donor in the trans-site to the Cu-N(IDA-like) bond). These findings are attributed to the influence of pi,pi-stacking interactions involving both rings of two 2,2'-bipy ligands in the molecular recognition process, forming pairs of complex molecules which probably build the crystal of compound 5 with non-coordinated water. (C) 2003 Elsevier Science Ltd. All rights reserved.