Multimetallic ruthenium(II) complexes based on biimidazole and bibenzimidazole: effect of dianionic bridging ligands on redox and spectral properties

Rillema, D. Paul; Sahai, R.; Matthews, Peter D.; Edwards, Katarina; Shaver, R.J.; Morgan, Larry W.

doi:10.1021/ic00327a006

Cited by 104 publications

(89 citation statements)

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“…Thus, the luminescence behavior of (1) is similar to that of [Ru(terpy) 2 ] 2+ , but different from that of [Ru(bbpH 2 ) 2 ] 2+ . (5) [Ru(terpy) 2 ] 2+ 1.28 c (6) [Ru(bpy) 3 ] 2+ 1.27 d (7) [Ru(bpy) 2 (BibzImH 2 )] 2+ 1.12 d (8) [Ru(bpy)(BibzImH 2 ) 2 ] 2+ 0.91 d (9) [Ru(BibzImH 2 ) 3 ] 2+ 0.80 d (10) [Ru(BiImH 2 ) 3 ] 2+ 0.54 d (11) [Ru(bpy)(BiImH 2 ) 2 ] 2+ 0.80 d (12) [Ru(bpy) 2 …”

Section: Uv-visible and Luminescence Spectroscopymentioning

confidence: 99%

Synthesis, crystal structure determination, spectroscopic and electrochemical studies of trans-[Ru(PPh3)2(bbpH2)Cl]Cl·CHCl3·H20 (bbpH2=2,6-bis(benzimidazolyl) pyridine) – an infinite double columnar supramolecule in the solid state

Mishra

Naskar

Chattopadhyay

et al. 2005

Transition Met Chem

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Synthesis, crystal structure determination, spectroscopic and electrochemical studies of trans-[Ru(PPh 3 ) 2 (bbpH 2 )Cl]ClAECHCl 3 AEH 2 0 (bbpH 2 ¼ 2,6-bis(benzimidazolyl) pyridine) -an infinite double columnar supramolecule in the solid state Abstract The synthesis, crystal structure, redox and spectroscopic properties of trans-[Ru(bbpH 2 )(PPh 3 ) 2 Cl]Cl are reported. In the crystalline solvate trans-[Ru(bbpH 2 )(PPh 3 ) 2c Cl]ClAECHCl 3 AEH 2 O, the molecular components are connected by strong intermolecular hydrogen bonding to form an infinite double column.

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Section: Uv-visible and Luminescence Spectroscopymentioning

confidence: 99%

Synthesis, crystal structure determination, spectroscopic and electrochemical studies of trans-[Ru(PPh3)2(bbpH2)Cl]Cl·CHCl3·H20 (bbpH2=2,6-bis(benzimidazolyl) pyridine) – an infinite double columnar supramolecule in the solid state

Mishra

Naskar

Chattopadhyay

et al. 2005

Transition Met Chem

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“…Bimetallic capsule 1 can also be designed from two doubly-fused biimidazole ligands. Its structure is similar to some photochemically active Ru(II) complexes [118]. The 8 N atom substitution mode of C 20 considered by Alder et al [102] is the same as in 1.…”

Section: Design Of Metal-doped Nanocapsulesmentioning

confidence: 56%

Transition metal and nitrogen doped carbon nanostructures

Stoyanov

Titov

Král

2009

Coordination Chemistry Reviews

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“…However, tris-biimidazole complexes of bivalent ruthenium are nonemitters at room temperature. [21,34] Further the parent type 1 organometallics also do not emit in the visible region. Thus the observed emission in 2 is a property peculiar to the coligation of η 1 -RL and dmbi to bivalent ruthenium.…”

Section: Photophysical Propertiesmentioning

confidence: 99%

“…Lifetime studies revealed single-exponential decay with τ 0 Յ 20 ns, which is shorter than the usual (10 2 Ϫ10 3 ns) lifetimes of fluorescent ruthenium() complexes of conjugated nitrogenous ligands. [21,23] …”

Section: Photophysical Propertiesmentioning

confidence: 99%

Synthesis, Structure, and Properties of Biimidazole‐Chelated Arylruthenium Complexes

2003

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By reacting Ru(η2‐RL)(PPh3)2(CO)Cl (1) with excess 4,5‐dimethyl‐2,2′‐biimidazole (dmbi), organometallics of the type [Ru(η1‐RL)(PPh3)2(CO)(dmbi)](PF6) (2) have been isolated in excellent yield (η2‐RL is C6H2O‐2‐CHNHC6H4R(p)‐3‐Me‐5, η1‐RL is C6H2OH‐2‐CHNC6H4R(p)‐3‐Me‐5 and R is Me, OMe and Cl). In this process the dmbi ligand undergoes five‐membered chelation, the iminium‐phenolato function tautomerizes to the imine‐phenol function and the Schiff base performs a large rotation around the Ru−C bond. The crystal and molecular structure of [Ru(η1‐MeL)(PPh3)2(CO)(dmbi)](PF6)·CH2Cl2 is reported. For steric reasons the carbon monoxide ligand is located syn to the phenolic oxygen atom as opposed to anti in the precursor 1. In the hydrogen bonded imine‐phenol function the O−H, H···N, and N···O distances are 0.83(8), 1.77(8), and 2.552(6) Å, respectively, the O−H···N angle being 156(2)°. The Ru(dmbi) chelate along with the metallated carbon atom and the CO ligand define an equatorial plane from which the metallated aldimine fragment is rotated by 34.5° due to interligand repulsion. This results in two unequal [2.348(2) and 2.411(2) Å] Ru−P bonds and an apparent suppression of the trans influence of the metallated carbanionic site. The cation and anion in the complex are engaged in N−H···F and C−H···F hydrogen bonding, generating a centrosymmetric dimer in the lattice. One of the hydrogen bonds, characterized by H···F, 2.03(8) Å and N−H···F, 166(2)°, is particularly strong. Solutions of 2 absorb near 400 nm and emit near 460 nm with quantum yields and lifetimes of ca. 10−3 and ⩽ 20 ns, respectively. The emission, which probably involves the 3MLCT state incorporating a π*(dmbi) contribution, is peculiar to the coligation of η1‐RL and dmbi to bivalent ruthenium. In dichloromethane solution 2 displays a quasireversible 2+/2 couple near 0.70 V vs. SCE [2+ is the ruthenium(III) analogue of 2]. Coulometrically generated solutions of 2+ display a strong absorption near 400 nm and rhombic EPR spectra with g values near 2.55, 2.15, and 1.83. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)

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Multimetallic ruthenium(II) complexes based on biimidazole and bibenzimidazole: effect of dianionic bridging ligands on redox and spectral properties

Cited by 104 publications

References 0 publications

Synthesis, crystal structure determination, spectroscopic and electrochemical studies of trans-[Ru(PPh3)2(bbpH2)Cl]Cl·CHCl3·H20 (bbpH2=2,6-bis(benzimidazolyl) pyridine) – an infinite double columnar supramolecule in the solid state

Synthesis, crystal structure determination, spectroscopic and electrochemical studies of trans-[Ru(PPh3)2(bbpH2)Cl]Cl·CHCl3·H20 (bbpH2=2,6-bis(benzimidazolyl) pyridine) – an infinite double columnar supramolecule in the solid state

Transition metal and nitrogen doped carbon nanostructures

Synthesis, Structure, and Properties of Biimidazole‐Chelated Arylruthenium Complexes

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