Novel heteroleptic ruthenium sensitizers containing carbazole linked 4,5-diazafluorene ligand for dye sensitized solar cells

Radhakrishnan, Sridhar; Manivel, Arumugam; Meléndrez, Manuel; Martínez‐Oyanedel, José; Bunster, Marta; Vergara, Carola; Paulraj, Mosae Selvakumar

doi:10.1016/j.poly.2014.11.008

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…In a valuable attempt to explore the structure−activity relationships in their photophysical and electrochemical behaviors and in their performance in DSSCs, a motivating series of heteroleptic Ru(II) complexes, 64−68, 109 were prepared with 4,4′-di(p-X-phenyl)-2,2′-bpy as the ancillary ligand in which the substituent X is CN (64), F (65), H (66), OMe (67), or NMe 2 (68). It is interesting to note that 64−68 showed higher ε values than N3 over the entire studied region, owing to the conjugation effect of the p-X-phenyl substituents (Figure 11).…”

Section: Chemical Reviewsmentioning

confidence: 99%

“…The extraordinary spiro-conjugated donor–acceptor systems exhibit ultrafast electron transfer and open new possibilities for the development of novel charge transfer chromophores. Keeping these viewpoints in mind, two novel ruthenium sensitizers, 420 and 421 , were studied that comprised two electron-donating carbazole units and an electron-accepting 4,5-diazafluorene . The obtained interesting results show that introduction of carbazole via the sp 3 -hybridized C9 atom of the 4,5-diazafluorene unit yielded significant changes in optical absorption spectra and subsequently altered intramolecular charge-transfer processes, which was reflected in the photovoltaic performance.…”

Section: Other Ruthenium Photosensitizersmentioning

confidence: 99%

“…In recent years, many polypyridyl ligands have been synthesized in which one or both of the pyridine rings are functionalized with aliphatic, aromatic, or combined aromatic and aliphatic moieties. − …”

Section: Introductionmentioning

confidence: 99%

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Influence of Ancillary Ligands in Dye-Sensitized Solar Cells

et al. 2016

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Dye-sensitized solar cells (DSSCs) have motivated many researchers to develop various sensitizers with tailored properties involving anchoring and ancillary ligands. Ancillary ligands carry favorable light-harvesting abilities and are therefore crucial in determining the overall power conversion efficiencies. The use of ancillary ligands having aliphatic chains and/or π-extended aromatic units decreases charge recombination and permits the collection of a large fraction of sunlight. This review aims to provide insight into the relationship between ancillary ligand structure and DSSC properties, which can further guide the function-oriented design and synthesis of different sensitizers for DSSCs. This review outlines how the new and rapidly expanding class of chelating ancillary ligands bearing 2,2'-bipyridyl, 1,10-phenanthroline, carbene, dipyridylamine, pyridyl-benzimidazole, pyridyl-azolate, and other aromatic ligands provides a conduit for potentially enhancing the performance and stability of DSSCs. Finally, these classes of Ru polypyridyl complexes have gained increasing interest for feasible large-scale commercialization of DSSCs due to their more favorable light-harvesting abilities and long-term thermal and chemical stabilities compared with other conventional sensitizers. Therefore, the main idea is to inspire readers to explore new avenues in the design of new sensitizers for DSSCs based on different ancillary ligands.

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Section: Chemical Reviewsmentioning

confidence: 99%

Section: Other Ruthenium Photosensitizersmentioning

confidence: 99%

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Influence of Ancillary Ligands in Dye-Sensitized Solar Cells

et al. 2016

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“…140 Some Ru photosensitizers with record high extinction coefficients possess 4,5-diazafluorenylidene ligands substituted with a 1,3-dithiole group (ε ≥ 40 000 M −1 cm −1 @ 470 nm), displaying rapid and efficient charge injection to TiO 2 . 141,142 In addition, Ru(II) complexes of 4,5-diazafluorene functionalized at the 9-position with carbazole groups, 143 aryl groups, 144 or bis(thiophene)pyrrolyl groups, 139 have all been used to create DSSCs based on TiO 2 . III.3.2.…”

Section: Iii2 45-diazafluorene Derivatives As Ligands In Catalysismentioning

confidence: 99%

Coordination chemistry and applications of versatile 4,5-diazafluorene derivatives

Annibale

Song

2016

Dalton Trans.

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This perspective review will examine the coordination chemistry and applications of metal complexes of 4,5-diazafluorene derivatives. The versatile derivatives of 4,5-diazafluorene can serve multiple roles, and display a number of coordination modes. The ambidentate derivatives with multiple coordination sites can allow for the syntheses of coordination polymers, multimetallic, and macrocyclic complexes. In addition, certain 4,5-diazafluorene derivatives can serve as spectator ligands to support reactivity at the metal centre, or as reactive actor ligands engaging in atypical reactivity patterns. The applications of metal complexes of 4,5-diazafluorene derivatives in catalysis, photochemistry and photophysics, as well as in bioinorganic chemistry are also surveyed.

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