9-(4-Dialkylaminostyryl)-acridines - a new class of acidochromic dyes

Lindauer, Heike; Czerney, Peter; Grummt, U.‐W.

doi:10.1002/prac.19943360608

Cited by 26 publications

(12 citation statements)

References 6 publications

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“…The absorption spectrum of DSA strongly depends on the medium pH [1], the pK value being about 5.1. Figure 1 shows the steady-state absorption spectra of the neutral (pH = 7) and protonated (pH = 3) forms.…”

Section: Resultsmentioning

confidence: 99%

“…Details of the synthesis of DSA and related compounds are described elsewhere [1]. The measurements were performed in alcohols of different viscosity.…”

Section: Methodsmentioning

confidence: 99%

“…Aminostyrylacridines are a sort of acidochromic dyes originally designed as pH sensitive sensitizers that absorb light in the visible and near infrared spectral regions [1]. They are promising indicators to be used in pH measurements in aggressive and/or microscopic media, where direct mechanical contact is deleterious and/or impossible, therefore, noninvasive technologies should be used.…”

Section: Introductionmentioning

confidence: 99%

“…1. Their pK is fine-tunable by a variation of the electron donor capability of the dialkylaminophenyl moiety via a proper choice of the substituents R 1 , R 2 , and, to a lesser extent, R 3 [1].…”

Section: Introductionmentioning

confidence: 99%

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Excited state relaxation of 9-(4-diethylaminostyryl)-acridine

Gulbinas¹,

Grigaravičius²,

Rotomskis³

2005

Lith. J. Phys.

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Excited state dynamics of neutral and protonated 9-(4-diethylaminostyryl)-acridine was investigated by means of picosecond fluorescence and pump-and-probe absorption techniques. Both forms show complex transient absorption spectra evolution on a ps time scale and multicomponental transient absorption relaxation, strongly dependent on the probe wavelength. The protonated form shows very weak fluorescence and its relaxation kinetics slows down in more viscous solvents indicating that conformational changes of molecules take place during relaxation of the excited state and form a significant energy deactivation channel. During the relaxation of the neutral molecules two fluorescent intermediates with lifetimes of 10 and 90 ps are formed. Relaxation dynamics of the neutral molecules is independent of the solvent viscosity excluding role of conformational changes.

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Section: Resultsmentioning

confidence: 99%

“…Details of the synthesis of DSA and related compounds are described elsewhere [1]. The measurements were performed in alcohols of different viscosity.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Excited state relaxation of 9-(4-diethylaminostyryl)-acridine

Gulbinas¹,

Grigaravičius²,

Rotomskis³

2005

Lith. J. Phys.

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“…The syntheses of the proton-carrying dyes, namely, 9-(4-diethylaminostyryl)acridine (referred to as L-l) and 9-(4-diethylamino-2-octadecyloxystyryl)acridine (L-2) have been described previously [18]. Their chemical structures are given in Fig.…”

Section: Chemicals and Solutionsmentioning

confidence: 99%

Optode membrane for continuous measurement of silver ions

et al. 1995

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Abstract. An optical sensor (optode) membrane for continuous monitoring of silver ion is presented. It is composed of plasticized poly(vinyl chloride) (PVC), a silver-sensitive chromo-ionophore, and a lipophilic borate salt acting as an anionic site. The membrane selectively responds to silver ion in the concentration range from 50 pM to 10 raM, giving a reversible colour change from blue to pink, with response times of the order of 2 min. The acridinium dye acts as both the recognition element and the chromo-ionophore. Its long-wave absorption band is at around 680 nm, which makes it compatible with existing LED light sources and diode lasers. A lipophilic octadecyl side chain renders it highly lipophilic and this prevents its leakage out of the PVC membrane. Hence, the operational lifetime exceeds 1 week, without any changes in the work function.Key words: silver sensor, optical sensors, chromo-ionophore, spectrophotometry, PVC membrane.Silver is widely used in conventional photography, the production of electrical conductors, and in electroplating. It has been estimated that the total annual loss of silver to the environment from industrial wastes exceeds 2500 metric tons [1], a fact that clearly points to the importance of monitoring and recycling of silver, both from a commercial and an environmental point of view.Numerous analytical procedures (including single-shot tests and field tests) have been described for determination of silver. However, in order to enable continuous monitoring, sensors rather than discontinuous methods are required. Among them, solid-state sensors based on silver sulphide are predominant. In addition, electrochemical ion-selective sensors (ISEs and ISFETs) based on plasticized PVC membranes, modified with various silver-selective ionophores such as thia-crown ethers [2][3][4][5][6][7], calixarenes [8,9], and pyridinophanes [10] have been reported. The

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