Chelate ring closure in (o-phenanthroline)pentacarbonylmetal transients (metal = chromium, molybdenum, tungsten) generated by pulsed laser flash photolysis

Zhang, Shulin; Zang, V.; Dobson, Gerard R.; Eldik, Rudi van

doi:10.1021/ic00002a043

Cited by 38 publications

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“…Changing donor group from amine to pyridine should increase the rate of metal-nitrogen bond formation. A similar trend in the values of the enthalpy of activation depending on the substituent on the donor atom were also found in these d 6 metal carbonyl complexes during the procedure of chelate ring closure [21][22][23][24][25][26][27]. The fastest rate of chelation found for 2c is consistent with these literature results.…”

Section: Resultssupporting

confidence: 90%

Chelate ring closing and opening behavior in cyclopentadienyl cobalt(III) complexes with pendant nitrogen functional group

Zhou

Zhang

et al. 2010

Journal of Organometallic Chemistry

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Section: Resultssupporting

confidence: 90%

Chelate ring closing and opening behavior in cyclopentadienyl cobalt(III) complexes with pendant nitrogen functional group

Zhou

Zhang

et al. 2010

Journal of Organometallic Chemistry

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“…Thereby, ring closure follows with loss of another CO ligand. If this latter process is too rapid, it is necessary to use flash photolysis techniques to initiate the kinetics 19−24. In some cases the intimate nature of the thermal process was revealed by the determination of the volumes of activation 20−24…”

Section: Introductionmentioning

confidence: 99%

Ring Closure Kinetics of Bidentate Hemilabile P,N and P,S Ligands on a Platinum(II) Complex

Romeo

Scolaro

Plutino

et al. 2002

Eur. J. Inorg. Chem.

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Complexes of the type cis-[PtPh 2 (CO)(η 1 -P−N)] and cis-[PtPh 2 (CO)(η 1 -P−S)], where bidentate phosphorus−nitrogen and phosphorus−sulfur ligands are bound to the metal centre in a monodentate fashion [P−N = Ph 2 PC 5 H 4 N (Ph 2 PPy), Ph 2 P(CH 2 ) 2 C 5 H 4 N (ppye), Ph 2 P(o-C 6 H 4 )NMe 2 (PNMe 2 ), Ph 2 P(CH 2 ) n NMe 2 (n = 2, 3, i.e., peNMe 2 and ppNMe 2 ) and P−S = Ph 2 P(CH 2 ) 2 SEt (P−SEt), Ph 2 P(CH 2 ) n SPh (n = 1, 2, i.e., P−CH 2 SPh and P−SPh)], were prepared in situ by reaction of the hybrid ligands with cis-[PtPh 2 (CO)(SEt 2 )]. In each case, the first observed process was the fast substitution of diethyl sulfide by the phosphanyl group leading to the monosubstituted ring-open cis-[PtPh 2 (CO)(η 1 -P−X)] (X = N or S) complexes, which were characterised in solution by 1 H and 31 P{ 1 H} NMR spectroscopy. These initially formed species undergo a slow ring closure process with extrusion of carbon monoxide and formation of the chelate [PtPh 2 (P−X)] products, except in the case of the short-bite Ph 2 PPy and P−CH 2 SPh ligands and of ppNMe 2 , where ring closure was not observed. The chelate complexes were isolated as solids

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“…Einerseits bestand die Annahme, dass die Photosubstitution dissoziativ aus dem angeregten Zustand des Ligandenfeldes abläuft (nach Anregung der MLCT-Bande wird der LF-Zustand durch thermische Rückbesetzung erreicht), andererseits hielt man den MLCT-Zustand für photoaktiv und vermutete eine assoziative Substitution im MLCT-Zustand. Bei direkter Bestrahlung der MLCT-Bande deuteten erste Ergebnisse für L = PEt 3 auf einen as- [43,44]. Bei direkter Bestrahlung der MLCT-Bande deuteten erste Ergebnisse für L = PEt 3 auf einen as- [43,44].…”

Section: Abb 13 Ln ϕ Gegen Den Druck P In Abhängigkeit Der Anregungunclassified

Teil II: Elektronentransfer / Photo-und strahlungsinduzierte Reaktionen

Eldik

Hubbard²

2000

Chemie in unserer Zeit

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Aufklärung anorganischer Reaktionsmechanismen307 2 Abb. 2. ∆V 0 cell gegen z ox 2 -z red 2 für einige ausgewählte Fe(II)/Fe(III)-Komplexe. 3 Abb. 3. Volumenprofil für den reversiblen Elektronentransfer [Ru III (NH 3 ) 5 L] 3+ + cyt c II ↔ [Ru II (NH 3 ) 5 L] 2+ + cyt c II I ; L = Isonicotinamid. Reaktanten Übergangszustand Produkte Reaktionskoordinate Relatives partielles molares Volumen, cm 3 mol -1 9 Abb. 9. Energie-und Volumenprofile für die reversible Bindung von CO an einen lacunaren Fe(II)-Komplex. Relatives partielles, molares Volumen, cm 3 mol -1 15 Reaktanten Übergangszustand Produkte Reaktionskoordinate Relatives partielles, molares Volumen, cm 3 mol -1 Abb. 14. Volumenprofil für die Reaktion von Methylradikalen mit dem Nitrilotriacetat-Komplex des Co(II); R = CH 3 . Abb. 15. Volumenprofil für die Reaktion eines aliphatischen Radikals mit [Cr(H 2 O) 6 ] 2+ ; R = C(CH 3 ) 2 OH.

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Chelate ring closure in (o-phenanthroline)pentacarbonylmetal transients (metal = chromium, molybdenum, tungsten) generated by pulsed laser flash photolysis

Abstract: Chelate ring closure in (vl-bid)M(CO)5 complexes (bid = bidentate, potentially chelating ligand; M = Cr, Mo, W; eq 1)

Cited by 38 publications

References 0 publications

Chelate ring closing and opening behavior in cyclopentadienyl cobalt(III) complexes with pendant nitrogen functional group

Chelate ring closing and opening behavior in cyclopentadienyl cobalt(III) complexes with pendant nitrogen functional group

Ring Closure Kinetics of Bidentate Hemilabile P,N and P,S Ligands on a Platinum(II) Complex

Teil II: Elektronentransfer / Photo-und strahlungsinduzierte Reaktionen

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