Solvent effects in the reactions of 6-phenyl-2,2′-bipyridine with ruthenium(II)
摘要:
The reaction of [Ru(tpy)Cl3] with the potentially cyclometallating ligand 6-phenyl-2,2'-bipyridine (HL) has been examined in a variety of solvents. In glacial acetic acid the ligand acts as a substituted 2,2'-bipyridine and reacts to give the complex cation [Ru(tpy)(HL)Cl]+, containing a bidentate N,N'-bonded HL ligand. The structure of this complex has been unambiguously established from its H-1 NMR spectrum. In contrast, the use of water as a solvent gives the cyclometallated complex cation [Ru(tpy)(L)]+. In methanol and butan-1-ol, mixtures of these two products are formed. The work has been extended to 2,2':6',2''-terpyridines with aromatic substituents in the 4' position and the complexes have been characterised by H-1 NMR, electronic and FAB mass spectroscopic techniques and also by cyclic voltammetry.
Solvent effects in the reactions of 6-phenyl-2,2′-bipyridine with ruthenium(II)
摘要:
The reaction of [Ru(tpy)Cl3] with the potentially cyclometallating ligand 6-phenyl-2,2'-bipyridine (HL) has been examined in a variety of solvents. In glacial acetic acid the ligand acts as a substituted 2,2'-bipyridine and reacts to give the complex cation [Ru(tpy)(HL)Cl]+, containing a bidentate N,N'-bonded HL ligand. The structure of this complex has been unambiguously established from its H-1 NMR spectrum. In contrast, the use of water as a solvent gives the cyclometallated complex cation [Ru(tpy)(L)]+. In methanol and butan-1-ol, mixtures of these two products are formed. The work has been extended to 2,2':6',2''-terpyridines with aromatic substituents in the 4' position and the complexes have been characterised by H-1 NMR, electronic and FAB mass spectroscopic techniques and also by cyclic voltammetry.
Reversible cyclometallation at a ruthenium(II) centre
作者:Edwin C. Constable、Simon J. Dunne、David G. F. Rees、Chantal X. Schmitt
DOI:10.1039/cc9960001169
日期:——
The metallated complex [Ru(tbp)(tpy)][PF6][Htbp = 6-(2-thienyl)-2,2′-bipyridine, tpy = 2,2′:6′,2″-terpyridine] is converted to the non-metallated species [Ru(Htbp)(tpy)][PF6] containing an N,N,S-bonded Htbp ligand upon treatment with acid; this process is reversed upon reaction of [Ru(Htbp)(tpy)][PF6] with aqueous sodium hydroxide solution.