Simple poly(pyridine)ruthenium(II) photosensitizer: (2,2'-bipyridine)tetracyanoruthenate(II)

Bignozzi, Carlo Alberto; Chiorboli, Claudio; Indelli, María Teresa; Scandola, Maria Anita; Varani, G.; Scandola, Franco

doi:10.1021/ja00284a084

Cited by 116 publications

(121 citation statements)

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“…The retention behavior agrees well with the cation-complexing properties of the [18]crown-6 ring. [33] Increasing the methanol content in the mobile phase generally was found to decrease the retention of the metal ions, leading to the removal of the complex from the column and poor separation of the alkali metal ions.…”

Section: Separation Of Amino Acids: Separation Of An Amino Acid Mixtusupporting

confidence: 72%

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Synthesis, Characterization, Spectroscopic, and Electrochemiluminescence Properties of a Solvatochromic Azacrown‐Containing Cyanoruthenate(II): Potential Applications in Separation and Indirect Photometric Detection of Cations and Amino Acids in HPLC

Chu

Yam

2006

Chemistry A European J

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A new anionic ruthenium(II) complex, (Et4N)[Ru(tpyA18C6)(CN)3] (tpyA18C6=N-[4'-(2,2':6',2''-terpyridyl)]-1,4,7,10,13-pentaoxa-16-azacyclohexadodecane), has been synthesized and characterized. The complex was found to show pronounced solvatochromic behavior and, when dissolved in solution, changed its color from purple to yellow when the solvent system was varied from pure acetonitrile to pure water. Its absorption and emission energies in various solvents showed a linear dependence of the Gutman's acceptor number. The characteristic photoluminescence and electrochemiluminescence (ECL) of the complex were also found to be progressively quenched as the proportion of water in a water/acetonitrile mixture increased. Large changes in the chemical shifts of the 1H NMR and 13C NMR signals of [Ru(tpyA18C6)(CN)3]- in different solvents were observed. The complex has also been demonstrated to serve as a mobile-phase additive in high-performance liquid chromatography for separation of metal cations and amino acids. Comparison studies with the crown-free analogue, (Et4N)[Ru(tpy)(CN)3] (tpy = 2,2':6',2''-terpyridine), showed that other than the ion-pair effect, the allosteric host-guest interaction provided by the presence of the pendant crown was essential to the separation performance of the complex. Indirect detection of nonabsorbing analytes has been achieved by monitoring the absorbance changes of the eluent at the metal-to-ligand charge-transfer (MLCT) absorption band maximum of the complex at 445 nm. The effects of pH, ionic strength, and polarity of the mobile phase as well as the complex concentration on the selectivity and resolution have also been studied.

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Section: Separation Of Amino Acids: Separation Of An Amino Acid Mixtusupporting

confidence: 72%

“…The absorption bands at 430-570 nm with molar extinction coefficients in the order of 10 3 dm 3 mol À1 cm À1 in the visible region are assigned to the dpA polypyridyl complexes has been reported previously. [18] Simi-…”

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confidence: 99%

Synthesis, Characterization, Spectroscopic, and Electrochemiluminescence Properties of a Solvatochromic Azacrown‐Containing Cyanoruthenate(II): Potential Applications in Separation and Indirect Photometric Detection of Cations and Amino Acids in HPLC

Chu

Yam

2006

Chemistry A European J

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“…Finally, the effect of CN ( ligands on spin relaxation in the Ru(III) complex is an open question to which answers can be expected from a magnetic field dependent study of the electron transfer mechanism. 4 ]×/ 2H 2 O were prepared by the methods described in the literature [36,41]. The purity of these compounds was checked by elemental analysis and spectroscopic methods (UV Á/Vis, IR …”

Section: Introductionmentioning

confidence: 99%

Ligand dependence of magnetic spin effects on photooxidation of [Ru(bpy)3−n(CN)2n](+2−2n) type complexes

Fodor

Ülveczki

Horváth

et al. 2002

Inorganica Chimica Acta

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Photoinduced electron transfer reaction from the series of [Ru(bpy) (3(n ) (2'(2n ) complexes (n0/0, 1, 2) to methylviologen has been investigated using external magnetic field modulation in order to obtain relevant kinetic parameters for spin relaxation, backward electron transfer and cage escape of the geminate radical pair. The replacement of one bpy by two cyanide ligands results in an increase of the quenching rate constant and a decrease of the cage escape efficiency. The latter is decreased in a magnetic field and the sensitivity of this effect is weakened by introducing CN ( ligands. From the analysis of the magnetic field dependence it can be inferred that with increasing number of CN ( ligands, backward electron transfer rate and spin relaxation time in the geminate radical pair exhibit a moderate decrease but that the rate constant of cage escape decreases very strongly. #

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“…550-750 nm dominates its UV/Vis absorption and emission spectra, respectively. [13] With reference to previous studies, the low-energy absorption band is attributable to the Ru(dπ) Ǟ tBubpy-(π*) metal-to-ligand charge transfer (MLCT) transition while the low-energy emission band is assigned to the tBubpy(π*) Ǟ Ru(dπ) 3 MLCT emission. [14] boron halides [15] or other transition-metal ions [16] were used as Lewis acids.…”

Section: Spectroscopic Propertiesmentioning

confidence: 80%

A Pair of Coordination Donor–Acceptor Ensembles for the Detection of Tartrate in Aqueous Media

et al. 2008

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Simple poly(pyridine)ruthenium(II) photosensitizer: (2,2'-bipyridine)tetracyanoruthenate(II)

Cited by 116 publications

References 1 publication

Synthesis, Characterization, Spectroscopic, and Electrochemiluminescence Properties of a Solvatochromic Azacrown‐Containing Cyanoruthenate(II): Potential Applications in Separation and Indirect Photometric Detection of Cations and Amino Acids in HPLC

Synthesis, Characterization, Spectroscopic, and Electrochemiluminescence Properties of a Solvatochromic Azacrown‐Containing Cyanoruthenate(II): Potential Applications in Separation and Indirect Photometric Detection of Cations and Amino Acids in HPLC

Ligand dependence of magnetic spin effects on photooxidation of [Ru(bpy)3−n(CN)2n](+2−2n) type complexes

A Pair of Coordination Donor–Acceptor Ensembles for the Detection of Tartrate in Aqueous Media

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