The mechanisms of the acid-catalysed dissociation of tris-?-diketonatoruthenium(III) complexes

Chakravarty, B.; Adhikari, Swagata

doi:10.1007/bf01024192

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…The thiocyanate ligand in cis -Ru II (dcbpyH 2 ) 2 (NCS) 2 was found to be N-bound, determined by infrared spectroscopy , Thio- and selenocyanate ligands in Ru complexes are known in the N-, S-, and Se-bound modes and as bridging ligands for dimer complexes. − …”

Section: Introductionmentioning

confidence: 98%

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Ruthenium(II) Charge-Transfer Sensitizers Containing 4,4‘-Dicarboxy-2,2‘-bipyridine. Synthesis, Properties, and Bonding Mode of Coordinated Thio- and Selenocyanates

1996

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The synthesis and properties of several complexes of Ru(II) containing 4,4′-dicarboxy-2,2′-bipyridine (dcbpyH 2 ), 2,6-bis(1-methylbenzimidazol-2-yl)pyridine (bmipy), or 2,6-bis(1-methylbenzimidazol-2-yl)-4-phenylpyridine (phbmipy), and monodentate ligands (X -) Cl -, I -, NCS -, NCSe -, CN -) are reported. The introduction of the ambident ligands X -) NCS -, NCSe -, and CNinto the coordination sphere of [Ru(bmipy)(dcbpy)I] -and cis-Ru(dcbpyH 2 ) 2 Cl 2 has been studied in situ via 1 H and 13 C NMR spectroscopy using 13 C-enriched ligands X -. Introduction of thiocyanate and selenocyanate initially yields the two possible linkage isomers in comparable amounts; prolonged reaction time converts the S-bound isomer and the Se-bound isomer to the N-bound isomers. The isoselenocyanate complex decomposes rapidly, yielding the cyano complex under loss of Se. The N-bound isothiocyanato complex K[Ru(bmipy)(dcbpy)(NCS)] was found to be an efficient sensitizer for nanocrystalline TiO 2 ; the incident monochromatic photon-to-current efficiency (IPCE) is nearly quantitative at 520 nm. Introduction of a phenyl group in the 4-position of the 2,6-bis(1-methylbenzimidazol-2-yl)pyridine ligand gives a red-shifted absorption maximum for the corresponding phenylated K[Ru(ph-bmipy)(dcbpy)(NCS)] complex with an increased molar absorption coefficient for the MLCT maximum at 508 nm. At longer wavelengths above 620 nm, phenyl substitution does not enhance the absorption coefficients of the complex. Compared to that of K[Ru(bmipy)-(dcbpy)(NCS)], the performance of the phenylated complex is reduced in a solar cell due to lower IPCE values. The visible spectra of the halide complexes K[Ru(bmipy)(dcbpy)X] (X -) Cl -, I -) show enhanced red response, but the complexes exhibit strongly reduced overall IPCE values. A comparison of the complexes to cis-Ru-(dcbpyH 2 ) 2 (NCS) 2 is presented. Possible strategies for the design of more efficient sensitizers are discussed.

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Section: Introductionmentioning

confidence: 98%

“…12,13 Thio-and selenocyanate ligands in Ru complexes are known in the N-, S-, and Se-bound modes and as bridging ligands for dimer complexes. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Inorg. Chem.…”

Section: Introductionmentioning

confidence: 99%

Ruthenium(II) Charge-Transfer Sensitizers Containing 4,4‘-Dicarboxy-2,2‘-bipyridine. Synthesis, Properties, and Bonding Mode of Coordinated Thio- and Selenocyanates

1996

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Effects of a chelating agent ‐ 2,4‐pentanedione on low temperature composite molding of vinyl ester and unsaturated polyester resins

Lee

2002

Polymer Composites

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A major concern in low temperature composite manufacturing processes is how to design and control the mold filling and curing time. Inhibitors or retarders are often used to prevent premature gelation and provide a sufficiently long time to fill the mold completely. However, the addition of these chemical species tends to result in a low mold curing rate and a low final resin conversion. In this study, a chelating agent 2,4-pentanedione [2,4-P) was used to manipulate resin gelation and curing. This agent is known to affect the catalytic activity of the promoters (i.e. metal compounds such as cobalt carboxylates) in the decomposition of initiators. It can function as either a retarder or a co-promoter in the co-polymerization of styrene/polyester and styrene/vinyl ester resins depending on the acidity of the resin system. Based on this observation, an improved room temperature vacuumassisted resin transfer molding process was designed. This design allows 2.4-P to serve first as a retarder during mold filling to achieve a long gel time, it then as a co-promoter during curing to increase the curing rate. The 2.4-P also increases the resin conversion as the acidity of the resin increases.

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Ruthenium

Wong¹

1994

Coordination Chemistry Reviews

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The mechanisms of the acid-catalysed dissociation of tris-?-diketonatoruthenium(III) complexes

Cited by 5 publications

References 18 publications

Ruthenium(II) Charge-Transfer Sensitizers Containing 4,4‘-Dicarboxy-2,2‘-bipyridine. Synthesis, Properties, and Bonding Mode of Coordinated Thio- and Selenocyanates

Ruthenium(II) Charge-Transfer Sensitizers Containing 4,4‘-Dicarboxy-2,2‘-bipyridine. Synthesis, Properties, and Bonding Mode of Coordinated Thio- and Selenocyanates

Effects of a chelating agent ‐ 2,4‐pentanedione on low temperature composite molding of vinyl ester and unsaturated polyester resins

Ruthenium

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