Cyclometalated ruthenium(<scp>ii</scp>) complexes with bis(benzimidazolyl)benzene for dye-sensitized solar cells

Shao, Jiang‐Yang; Fu, Nianqing; Yang, Wenwen; Zhang, Chunyu; Zhong, Yu‐Wu; Lin, Yuan; Yao, Jiannian

doi:10.1039/c5ra20294a

Cited by 15 publications

(9 citation statements)

References 85 publications

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“…On the other hand, a (too) high-lying HOMO impedes or even prevents an efficient regeneration of the dye by the redox couple ( E I–/I2·– = 0.8 V vs normal hydrogen electrode (NHE) , or E I–/I3– = 0.4 V vs NHE). These aspects of cyclometalated ruthenium dyes have since then been extensively studied by the groups of van Koten, − Berlinguette, − and others. − …”

Section: Introductionmentioning

confidence: 99%

Ruthenium(II) Bipyridyl Complexes with Cyclometalated NHC Ligands

Schleicher

Leopold

Borrmann³

et al. 2017

Inorg. Chem.

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We present the synthesis and characterization of novel cyclometalated ruthenium N-heterocyclic carbene (NHC) complexes of the general formula [Ru(C^C*)(bpy)]PF (bpy = 2,2'-bipyridine), with the C^C* ligand being based on different 1-phenylimidazoles. They were synthesized in a one-pot procedure starting from the corresponding p-cymene NHC complexes [Ru(C^C*)(p-cymene)Cl]. Their structural, spectroscopic, and electrochemical properties were investigated by NMR, X-ray, UV/vis, and CV, as well as density functional theory methods. Because of the stronger electron-donating carbene ligands, these complexes represent a new class of bisheteroleptic dyes with improved photophysical and electrochemical properties.

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Section: Introductionmentioning

confidence: 99%

Ruthenium(II) Bipyridyl Complexes with Cyclometalated NHC Ligands

Schleicher

Leopold

Borrmann³

et al. 2017

Inorg. Chem.

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“…Ruthenium sensitizers with NCN (derivatives of 1,3‐di(pyridine‐2‐yl)benzene) and NNC (derivative of 6‐phenyl‐2,2’‐bipyridine) type of tridentate cyclometalated ligands are known ,. In this work, we chose the former type, as they are easier to synthesize than the latter.…”

Section: Resultsmentioning

confidence: 99%

Bis‐Tridentate‐Cyclometalated Ruthenium Complexes with Extended Anchoring Ligand and Their Performance in Dye‐Sensitized Solar Cells.

et al. 2018

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Ruthenium polypyridine complexes with six‐membered chelating rings have recently received significant attention due to their broad absorption spectra and outstanding photophysical characteristics. In this work we present the synthesis and characterization of three new heteroleptic bis‐tridentate cyclometalated ruthenium complexes, i. e. 1 a, 2 a, and 3 a, with donating and accepting ligands. Complexes 2 a and 3 a are coordinated with 2,6‐di(quinolin‐8‐yl)‐4‐methoxycarbonylpyridine (dqpCO2Me), and 1 a with 2,2’:6’,2’’‐terpyridine‐4’‐ethoxycarbonyl (tpyCO2Et) accepting ligands. Interestingly, the binding mode of the accepting ligand was found to differ in 3 a and 2 a. NMR spectra and single crystal XRD data reveal that in 3 a one of the quinolines of dqpCO2Me ligand is cyclometalated, while in 2 a the ligand coordinates in an expected fashion similar to tpyCO2Et. The ester groups in 1 a and 2 a were hydrolyzed to obtain sensitizers 1 and 2, which were used in dye‐sensitized solar cells (DSCs) and the device performance with both iodine‐ and cobalt‐based electrolytes was investigated. Complete 1H, 13C and 1H‐1H COSY NMR, and high‐resolution mass analyses of all complexes were conducted.

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“…To prepare dye-anchored films, fluorine-doped SnO 2 (FTO) glass that is covered with a thin layer of nanocrystalline TiO 2 as used in typical DSSCs was fabricated (see details in the Experimental section). The TiO 2 layer is around 3.5–4.0 μM thick, and the particle size is around 20 nm in diameter (see the scanning electron microscopy (SEM) pictures in Figure S4). The film has a surface dimension of 1.0 × 1.5 cm 2 .…”

Section: Resultsmentioning

confidence: 99%

Near-Infrared and Two-Wavelength Electrochromism Based on Nanocrystalline TiO₂ Films Functionalized with Ruthenium-Amine Conjugated Complexes

Shao

Zhong

2017

Inorg. Chem.

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Two cyclometalated ruthenium complexes 2 and 4 containing a redox-active amine substituent and three carboxylic acid groups were synthesized, where the ruthenium ion and the amine site were separated by a phenyl or biphenyl bridge for 2 and 4, respectively. Nanocrystalline TiO films on fluorine doped SnO (FTO)/glass substrates anchored with 2 or 4 were prepared. These films display two consecutive anodic waves in the potential region between +0.1 and +1.0 V vs Ag/AgCl. Among four organic solvents examined, the FTO/TiO/2 film displays the best cyclic electrochemical stability in ClCHCHCl. Both films exhibit promising two-step electrochromism in the near infrared region. A contrast ratio (ΔT%) of 42% at 1000 nm and 40% at 680 nm was achieved for the FTO/TiO/2 film in the single- and double-oxidation process, respectively. In contrast, the FTO/TiO/4 film shows electrochromism at 1300 nm (ΔT% = 58%) and 780 nm (ΔT% = 59%) in the single- and double-oxidation process, respectively. The coloration efficiency of these processes varies in a range of 150-270 cm/C. These films are potentially useful as variable optical attenuators for telecommunications.

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Cyclometalated ruthenium(ii) complexes with bis(benzimidazolyl)benzene for dye-sensitized solar cells

Abstract: The length of alkyl chains on the benzimidazole rings of cyclometalated ruthenium dyes is critical to the DSSC performance.

Cited by 15 publications

References 85 publications

Ruthenium(II) Bipyridyl Complexes with Cyclometalated NHC Ligands

Ruthenium(II) Bipyridyl Complexes with Cyclometalated NHC Ligands

Bis‐Tridentate‐Cyclometalated Ruthenium Complexes with Extended Anchoring Ligand and Their Performance in Dye‐Sensitized Solar Cells.

Near-Infrared and Two-Wavelength Electrochromism Based on Nanocrystalline TiO₂ Films Functionalized with Ruthenium-Amine Conjugated Complexes

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Cyclometalated ruthenium(ii) complexes with bis(benzimidazolyl)benzene for dye-sensitized solar cells

Abstract: The length of alkyl chains on the benzimidazole rings of cyclometalated ruthenium dyes is critical to the DSSC performance.

Cited by 15 publications

References 85 publications

Ruthenium(II) Bipyridyl Complexes with Cyclometalated NHC Ligands

Ruthenium(II) Bipyridyl Complexes with Cyclometalated NHC Ligands

Bis‐Tridentate‐Cyclometalated Ruthenium Complexes with Extended Anchoring Ligand and Their Performance in Dye‐Sensitized Solar Cells.

Near-Infrared and Two-Wavelength Electrochromism Based on Nanocrystalline TiO2 Films Functionalized with Ruthenium-Amine Conjugated Complexes

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Near-Infrared and Two-Wavelength Electrochromism Based on Nanocrystalline TiO₂ Films Functionalized with Ruthenium-Amine Conjugated Complexes