Reaction of 2-(arylazo)phenols 2-(4′-RC6H4NN)C6H3OH(Me-4) (H2ap-R, where H2 stands for the two dissociable protons and R for the substituent in the phenyl ring of the arylazo fragment) with [Rh(PPh3)3Cl] afforded a family of organometallic complexes of rhodium(III) of type [Rh(PPh3)2(ap-R)Cl]. The crystal structure of [Rh(PPh3)2(ap-NO2)Cl] has been determined. The 2-(arylazo)phenols are coordinated
2-(芳基偶氮)酚2-(4'-RC 6 H 4 N N)C 6 H 3 OH(Me-4)(H 2 ap-R,其中H 2代表两个可解离的反应质子 和R为在 苯基(Rh(PPh 3)3 Cl]的芳环偶氮片段的环)得到[Rh(PPh 3)2(ap-R)Cl]类型的铑(III)的有机金属配合物家族。已经确定[Rh(PPh 3)2(ap-NO 2)Cl]的晶体结构。2-(芳基偶氮)酚通过酚的解离来配位质子 和 苯基 质子在邻位的位置苯基芳基偶氮片段中的环,如双阴离子三齿C,N,O供体,形成两个五元螯合环。1 H和13 C NMR谱的配合物与它们的组成和立体化学非常吻合。该络合物是抗磁性的(低旋转d 6,S = 0),并且在可见光和紫外线区域显示出强烈的吸收。循环伏安法对所有配合物而言,在0.65至1.10 V的电压范围内均表现出准可逆的氧化作用。 分会与-1.34 V到-1.50 V之间的不可逆降低。
Chemistry of 2-(arylazo)phenolate complexes of ruthenium. Synthesis, characterization and redox properties
作者:Nimai Chand Pramanik、Samaresh Bhattacharya
DOI:10.1016/s0277-5387(97)00028-4
日期:1997.1
salts. These oxidized complexes are one-electron paramagnetic low-spin, d5, S = 1 2 ) and show rhombic ESR spectra at 77 K. In acetonitrile solution they show intense LMCTtransitions in the visible region together with weak ligand-field transitions at lower energies. Chemical reduction of these ruthenium(III) complexes by hydrazine gives back the parent ruthenium(II) complexes.
摘要合成并表征了五种钌类型[RuII(bpy)(ap-R)2](bpy = 2,2'-bipyridine)的2-(芳基偶氮)酚盐(ap-R)配合物。络合物是抗磁性的(低旋转d6,S = 0),在乙腈溶液中在可见光区显示出很强的MLCT跃迁。乙腈溶液中复合物的循环伏安法显示,相对于SCE,钌(II)-钌(III)的可逆氧化范围为0.04-0.26 V,然后钌酸(III)-钌(IV)的不可逆氧化范围为1.18-1.32 V vs SCE。这两种氧化的电势对apR配体中取代基R的性质敏感。与SCE相比,在-1.6 V附近也观察到配位bpy的单电子降低。五个[RuIII(bpy)(ap-R)2] +配合物是通过碘将其各自的钌(II)前体化学氧化而合成的,并分离为碘化物盐。这些氧化的络合物是单电子顺磁低自旋,d5,S = 1 2),在77 K时显示菱形ESR光谱。在乙腈溶液中,它们在可见光区域显示
Chemistry of 2-(arylazo)phenolate complexes of ruthenium. Synthesis, structure and reactivities
chelate rings The complexes are paramagnetic (low-spin d5S=1/2) and show rhombic ESR spectra in 1:1 dichloromethane–toluene solution at 77 K In carbon tetrachloride solution these complexes show intense LMCTtransitions in the visible region together with weak ligand-field transitions in the near-IR region All the complexes display two cyclic voltammetric responses a ruthenium(III)–ruthenium(IV) oxidation
Iridium(III) Complexes Formed by O−H and/Or C−H Activation of 2-(Arylazo)phenols
作者:Rama Acharyya、Falguni Basuli、Ren-Zhang Wang、Thomas C. W. Mak、Samaresh Bhattacharya
DOI:10.1021/ic034785w
日期:2004.1.1
(H)Cl] and [Ir(PPh(3))(2)(NO-R)(H)(2)] complexes, the 2-(arylazo)phenolate ligands are coordinated to the metal center as monoanionic bidentate N,O-donors, whereas in the [Ir(PPh(3))(2)(CNO-R)(H)] complexes, they are coordinated to iridium as dianionic tridentate C,N,O-donors. In all three products formed in ethanol, the two PPh(3) ligands are trans. Reaction of 2-(arylazo)phenols with [Ir(PPh(3))(3)Cl]
Synthesis, Structure, and Electrochemical Properties of a Family of 2-(Arylazo)phenolate Complexes of Ruthenium with Unusual C−C Coupling and NN Cleavage
作者:Sarmistha Halder、Rama Acharyya、Shie-Ming Peng、Gene-Hsiang Lee、Michael G. B. Drew、Samaresh Bhattacharya
DOI:10.1021/ic060689u
日期:2006.11.1
and six-membered chelate rings, while the third one has undergone cleavage across the N=N bond, and the phenolate fragment, thus generated, remains coordinated to the metal center in the iminosemiquinonate form. Structures of four selected complexes have been determined by X-ray crystallography. The first six complexes are one-electron paramagnetic and show rhombic ESR spectra. The last complex is diamagnetic
2-(4'-R-苯基偶氮)-4-甲基苯酚(R = O ,CH3,H,Cl和NO2)与[Ru(dmso)(4)Cl2]的反应生成5个钌(III)族配合物,其包含形成六元螯合环的2-(芳基偶氮)酚盐配体和由两个2-(芳基偶氮)酚通过不寻常的CC偶合形成的四齿配体,所述CC偶合芳基偶氮片段中苯环的两个邻碳。与2-(2'-甲基苯基偶氮)-4-甲基苯酚与[Ru(dmso)(4)Cl2]的相似反应提供了相似的络合物,其中一个2-(2'-甲基苯基偶氮)-4-甲基苯酚配体为配位形成六元螯合环,另外两个配体发生CC偶联反应,偶合物种配位成四齿配位体,形成五元N,O螯合环,九元N,N -螯合环 和另一个五元螯合环。2-(2',6'-二甲基苯基偶氮)-4-甲基苯酚与[Ru(dmso)(4)Cl2]的反应提供了其中两个2-(2',6'-二甲基苯基偶氮)-4-甲基苯酚的络合物被作为二齿N,O供体形成五元和六元螯合环而被配位,而第三个则经过N