Coordination ability of alkali metal or alkaline earth metal ions with aromatic dicarboxylate, sulfonate, or disulfonate ions in acetonitrile

Hojo, Masashi; Ohta, Sho; Ayabe, Keita; Okamura, Kei; Kobiro, Kazuya; Chen, Zhidong

doi:10.1016/j.molliq.2012.10.033

Cited by 10 publications

(6 citation statements)

References 45 publications

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“…Going from the DS to Li electrolytes, the addition of Li + and removal of benzimidazole (a Lewis base) will change the protonation/ ion pair state of the carboxylates and possibly that of the NCS − group. 20 Shifts in the N719ox spectrum have previously been observed between solution and surface as well as shifts in the N719* spectrum with pH. 16,18 We now turn to the transient decay kinetics.…”

Section: ■ Results and Discussionmentioning

confidence: 90%

Evidence for “Slow” Electron Injection in Commercially Relevant Dye-Sensitized Solar Cells by vis–NIR and IR Pump–Probe Spectroscopy

et al. 2013

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We present femtosecond to nanosecond transient absorption (TA) data on electron injection in dye-sensitized solar cells (DSSCs) fabricated with low volatility, commercially relevant electrolytes, with and without added lithium. Results are shown over an extended time range (300 fs−6.3 ns) and extended wavelength range (800−1400 nm) for both N719 and C106 dyes. Kinetics were measured on both TiO 2 and noninjecting ZrO 2 . Using the latter, we have determined the spectra and absorption coefficient of N719* across the wavelength range. We find an isosbestic point in the TA spectra on TiO 2 near 900 nm for all cells, existing from <1 ps to >1 ns. We show how measurements near this isosbestic point can give a false impression of uniformly femtosecond injection dynamics in DSSCs. Comparison of dynamics measured at 1200 nm with mid-IR transient absorption measured at 5100 nm confirms a majority proportion of slow (>10 ps) electron injection in these commercially relevant cells. We also comment on a recent publication which appears to directly contradict the results we present.

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Section: ■ Results and Discussionmentioning

confidence: 90%

Evidence for “Slow” Electron Injection in Commercially Relevant Dye-Sensitized Solar Cells by vis–NIR and IR Pump–Probe Spectroscopy

et al. 2013

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“…The precipitation and successive re-dissolution reactions between Li + and L 3-in MeCN can be illustrated by Scheme 1. The precipitates of a lithium mono-sulfonate salt (benzenesulfonate [32] or p-toluenesulfonate [7]) have been re-dissolved completely by the addition of more than 0.1 mol dm -3 LiClO 4 in MeCN. However, the precipitates of dilithium 1,5-naphthalenedisulfonate have never been re-dissolved in the presence of even 1.0 mol dm -3 LiClO 4 [7].…”

Section: Evaluation Of "Reverse" Coordination Formation Constantsmentioning

confidence: 99%

“…In aprotic solvents such as acetonitrile (MeCN), the specific coordination reactions between alkali metal or alkaline earth metal ions with some simple ions such as halides (Cl -, Br -) [4,5], tropolonate [6], sulfonates, and carboxylates [7] have been demonstrated by means of various analytical methods. With the increasing concentration of M + (an alkali metal ion), the specific reaction may proceed in three steps: at first, a half equivalence or less than that amount of M Fuoss and Kraus [9] have introduced the concept of triple ion between free ions and triple ions in the solvents of low permittivity (ε r < 10 or 23.2).…”

Section: Introductionmentioning

confidence: 99%

“…Previously [7,16], the specific complexing behavior of alkali metal or alkaline earth metal ions with p-toluenesulfonate and 1,5-naphthalenedisulfonate ions has been thoroughly investigated in MeCN, alcohols, and binary solvents of MeCN-H 2 O and MeCN-alcohols. Naphthalenetrisulfonate is commonly used as a chemical function of Suramin and Suradistas [28].…”

Section: Introductionmentioning

confidence: 99%

“…However, 5.0% H 2 O causes incomplete precipitation (cf. The properties of residual (or small amount of) water in organic solvents have been discussed previously [7,16]. Now that the "residual" water molecules in an organic solvent are isolated each other and cannot form the huge network through hydrogen bonding, its role in the non-aqueous solvent must be similar to diethyl ether [37,38].…”

mentioning

confidence: 99%

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