Electrochemical oxidation of diaquaruthenium(II) complexes of quaterpyridines and crystal structure of [RuL¹(PPh₃)₂][ClO₄]₂(L¹= 3″,5,5′,5‴-tetramethyl-2,2′: 6′,2″: 6″,2‴-quaterpyridine)

The Higher Oligopyridines and their Metal Complexes

“…Almost all transition metal ions were reacted with qpy ligands to form square planar (Pt(II) [71], tetrahedral Ag(I) and Cu(I), octahedral (most metals) or sevencoordinated Re(V)-complexes [72], respectively. Among them are the following metal complexes mentioned: Ru(II) [39,73], W(IV) [74], Y(III) [75], Ce(III) [31] Re(V) [72], Re(I) [76].…”

“…''-quaterpyridine) is an active catalyst for the electrochemical oxidation of propan-2-ol[39].D o u b l e -h e l i c a l R u ( I I ) c o m p l e x e s o f 2,2':6',2'':6'',2''':6''',2''''-quinquepyridine (quipy) were prepared from RuCl 3 .xH 2 O and quipy. Electrochemical oxidation of [Ru 2 (quipy) 2 (H 2 O)2 ] 4+ in aqueous solution generate high valent oxoruthenium complexes of quipy, which are powerful oxidants towards alcohols, alkenes and alkanes[106].…”

Geometry matters: inverse cytotoxic relationship for cis/trans-Ru(ii) polypyridyl complexes from cis/trans-[PtCl2(NH3)2]

“…The qpy ligand and derivatives have been reported as a tetradentate ligand in mononuclear Ru(II) complexes, 8d, 8e, 11 but some derivatives may act as a bridging ligand in dinuclear Ru(II) complexes. 8a, 12 Thus, the mono-metallic structure of the complex 2a was confirmed by the further synthesis and characterization of trans- [Ru(qpy)(py) 2 ] 2+ ( 2b , py = pyridine) from 2a .…”

Catalytic Water Oxidation by Ruthenium(II) Quaterpyridine (qpy) Complexes: Evidence for Ruthenium(III) qpy‐N,N′′′‐dioxide as the Real Catalysts

“…[13] Inspired by the work of Sun et al we wanted to prepare six-coordinate ruthenium complexes based on qpy and pyridine ligands. Qpy is known to form metal complexes in trans configuration with a relatively large N-M-N bite angle, [14] hence it may be possible to form a seven-coordinate M=O species. We describe herein the synthesis and catalytic water oxidation by a series of ruthenium(II) complexes [Ru(qpy)(L) 2 ] 2+ (Scheme 1).…”

“…The synthesis of the ruthenium complexes is summarized in Scheme 1; complex 7 has been reported by Che et al [14] The structures of 3, 4, and 5 have been determined by X-ray crystallography. In 3, the ruthenium center adopts a distorted octahedral geometry with the equatorial positions occupied by the planar qpy ligand, and the axial positions by two picoline ligands (Figure 1 and Tables S1 and S2).…”