名称:
Synthesis, structure, DNA interaction and nuclease activity of rhodium(III)–arylazoimidazole complexes
摘要:
The Rh(III) complexes of 1-alkyl-2-(arylazo)imidazoles (RaaiR'), [Rh(X)(2)(RaaiR')(2)](ClO4) (R = H (1, 3), Me (2, 4); R' = Me (a), Et (b), CH2Ph (c); X = Cl (1, 2), N-3 (3, 4)), are synthesized and characterized by spectral (IR, UV-Vis, Mass and H-1 NMR) data. The structural confirmation has been done by single crystal X-ray diffraction study of [RhCl2(MeaaiEt)(2)]ClO4 (2b) (MeaaiEt, 1-ethyl-2-(p-tolylazo) imidazole). The DNA binding of the complexes (binding constant: 0.86 x 10(4) to 1.05 x 10(5)) have been examined by absorption and fluorescence spectroscopic measurements. The nuclease activity of the complexes are examined by gel-electrophoresis and has revealed the highest activity of [Rh(N-3)(2)(RaaiR')(2)]ClO4. The DFT computation has been performed to the optimized geometry of the complexes to interpret the electronic structures and their spectral properties. (C) 2012 Elsevier B.V. All rights reserved.