Journal of Organometallic Chemistry p. 3908 - 3917 (2005)
Update date:2022-08-04
Topics:
Acharyya, Rama
Basuli, Falguni
Peng, Shie-Ming
Lee, Gene-Hsiang
Wang, Ren-Zhang
Mak, Thomas C.W.
Bhattacharya, Samaresh
Reaction of 2-(2′,6′-dimethylphenylazo)-4-methylphenol with [Ir(PPh3)3Cl] in refluxing ethanol in the presence of a base (NEt3) affords an organoiridium complex 5, where the 2-(2′,6′-dimethylphenylazo)-4-methylphenol is coordinated to iridium, via C-H activation of a methyl group, as a dianionic tridentate C,N,O-donor. Two triphenylphosphines and a hydride are also coordinated to the metal center. A similar reaction carried out in toluene affords complex 5 along with a similar complex 7, where a chloride is coordinated to iridium instead of the hydride. Reaction of 2-(2′-methylphenylazo)-4-methylphenol with [Ir(PPh3)3Cl] in refluxing ethanol in the presence of a base (NEt3) affords an organoiridium complex 12, where the 2-(2′-methylphenylazo)-4-methylphenol is coordinated to iridium, via C-H activation at the ortho position of the phenyl group in the 2′- methylphenylazo fragment, as a dianionic tridentate C,N,O-donor. Two triphenylphosphines and a hydride are also coordinated to the metal center. A similar reaction carried out in toluene affords a complex 12 along with a similar complex 13, where a chloride is coordinated to iridium instead of the hydride. Structures of complexes 5, 12 and 13 have been determined by X-ray crystallography. In all these complexes, the two triphenylphosphines are trans. All these complexes show intense MLCT transitions in the visible region. Cyclic voltammetry on all the complexes shows an Ir(III)-Ir(IV) oxidation within 0.60-0.73 V vs. SCE, followed by an oxidation of the coordinated 2-(arylazo)phenolate ligand within 1.08-1.39 V vs. SCE. A reduction of the coordinated 2-(arylazo)phenolate ligand is observed within -1.10 to -1.26 V vs. SCE.
View MoreWuhan Yitongtai Science and Technology Co.,Ltd.
Contact:+86-27-88933550
Address:27th Fl. Bldg. 1, Shuian International Mansion, Heping Ave, Wuhan, Hubei, China
Contact:+86-532-80762375
Address:No. 6, Hongkong Middle Road, Qingdao, China
Contact:13120882795;+86-21-34621078;+86-021-31122318
Address:Suite 2,No.2715 Longwu Road
Dalian Join King Biochemical Tech. Co., Ltd.
Contact:0411 39216206
Address:814 First State Blvd
Beijing Merson Pharmaceutical Co., Ltd
Contact:0086-10-80484934 0086-10-80484574/
Address:2nd Floor , No. 2 Building , No. 14 Houshayu Duan, Jingmi Road ,Shunyi District , Beijing 101318, P.R.China
Doi:10.1016/S0040-4039(00)94325-9
(1990)Doi:10.1002/anie.200501374
(2005)Doi:10.1021/ol0518885
(2005)Doi:10.1021/ma050762k
(2005)Doi:10.1021/jo00169a003
(1983)Doi:10.1016/j.tetlet.2005.09.010
(2005)