Interaction of 2-(arylazo)phenols with rhodium. Usual coordination vs. C-H and C-C activation

被引:17
作者
Baksi, Suparna
Acharyya, Rama
Dutta, Swati
Blake, Alexander J.
Drew, Michael G. B.
Bhattacharya, Samaresh [1 ]
机构
[1] Jadavpur Univ, Dept Chem, Inorgan Chem Sect, Kolkata 700032, W Bengal, India
[2] Univ Nottingham, Sch Chem, Nottingham NG7 2RD, England
[3] Univ Reading, Dept Chem, Reading RG6 6AD, Berks, England
基金
英国工程与自然科学研究理事会;
关键词
2-(arylazo)phenols; rhodium; usual coordination; C-H and C-C activation;
D O I
10.1016/j.jorganchem.2006.10.063
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Reaction of 2-(2'-hydroxyphenylazo)phenol with [Rh(PPh3)(3)Cl] in refluxing benzene in presence of triethylamine afforded a red complex in which the ligand is coordinated to rhodium as a tridentate O,N,O-donor. However, similar reaction of [Rh(PPh3)(3)Cl] with 2-(2'carboxyphenylazo)-4-methylphenol yielded two complexes, viz. a blue one and a green one. In both the complexes the ligand is coordinated as C,N,O-donor. However, in the blue complex orthometallation takes place from the ortho-carbon atom, which bears -COOH group via decarboxylation and in green one orthometallation occurs from the other ortho-carbon. Structures of all the three complexes were determined by X-ray crystallography. In all the three complexes rhodium is sharing the equatorial plane with the tridentate ligand and a chloride, and the two triphenylphosphines are axially disposed. All of the complexes show intense MLCT transitions in the visible region. Cyclic voltammetry on these complexes shows a Rh(III)-Rh(IV) oxidation on the positive side of SCE and a reduction of the coordinated azophenolate ligand on the negative side. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:1025 / 1032
页数:8
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