Redox regulation in ruthenium(II) polypyridyl complexes and their application in solar energy conversion

Theoretical Studies of the Electronic Structure and Spectroscopic Properties of [Ru(Htcterpy)(NCS)3]3–

“…However, the main drawback of this sensitizer is its lack of absorption in the red region of the visible spectrum. Numerous attempts to synthesize superior sensitizers [16][17][18][19] failed to improve the efficiency and to enhance the spectral response in the red and infrared region until 1997. In 1997, Grätzel and coworkers [20] reported a terpyridine-Ru II complex, the "black dye", with visible absorption extending into the near-IR region up to 920 nm, yielding over 80 % IPCE, and producing an overall efficiency of 10.4 %.…”

“…Since the spectroscopic properties of the dye are crucial in determining its long-term stability, the light-harvesting efficiency of the DSSCs, and the charge-transfer dynamics at the semiconductor interface, [16,23] a full understanding of its electronic properties, especially in the excited state, is very essential. In contrast to the numerous experimental studies, only a few theoretical calculations have been performed for dye molecules.…”

DSSC'ler için NNN ligantlar ile kararlaştırılmış Rutenyum malzemeler

“…Bu komplekslerin optik ve redoks özellikleri, kendilerine güneş enerjisi dönüşüm proseslerinde büyük ilgi kazandırmıştır [6]. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. 2012 yılında NNN ve 4,4′ -dikarboksilik asit-2,2′ -bipiridin ligantları içeren üç adet rutenyum kompleksi sentezlendi ve boya duyarlı güneş hücrelerinde duyarlaştırıcı olarak kullanıldı [22].…”

Investigation of Novel Electrode Materials for Electrochemically-Based Remediation of High- and Low-Level Mixed Wastes in the DOE Complex - Final Report

“…23,[25][26][27][28][29][30] In this work, we have explored the approach of replacing ruthenium with osmium in the transition metal complexes that are used to sensitize nanocrystalline TiO 2 . The osmium complexes are expected to have an additional absorption band at longer wavelengths compared to a ruthenium complex having the same ligands, because direct excitation to the triplet state in Os(II) (bipyridine) x L y systems is not as forbidden as in the Ru(II) (bipyridine) x L y systems.…”

“…In a particularly exciting development, Grätzel and co-workers have developed efficient photoelectrochemical cells through the use of sensitizers based on transition metal complexes deposited on nanocrystalline titanium dioxide electrodes. [22][23][24][25][26][27] The highest efficiency reported to date for such systems has been obtained using nanocrystalline TiO 2 coated with [Ru(II)(4,4'-(CO 2 H) 2 -2,2'-bipyridine) 2 2 ), where L' is 4,4'-dicarboxylato-2,2'-bipyridine), for which overall solar-to-electrical energy conversion efficiencies of up to 10% have been reported. 24 Notably, the (Ru(H 2 L') 2 (NCS) 2 ) complex requires excitation by 2.5 eV photons before significant light absorption takes place.…”