Ion-molecule reaction chemistry of ionic transition-metal carbonyl cluster fragments. 1. Ligand-exchange reactions of chromium carbonyl (Cr2(CO)y+) ions

Sellers-Hann, L.; Russell, David H.

doi:10.1021/ja00172a007

Cited by 6 publications

(4 citation statements)

References 0 publications

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“…The carbonyl ligand elimination is the dominant process for CID of the Cr 2 (CO) 4 + , Cr 2 (CO) 5 + and Cr 2 (CO) 7 + clusters, whereas Cr 2 (CO) 6 + dissociates preferentially to Cr + and Cr(CO) 6 . These results are consistent with those obtained from high-energy CID experiments, 7 where the branching ratio of Cr + /Cr 2 + for Cr 2 (CO) 6 + was much larger than those for the other clusters, and the order of the metal-metal bond strength was determined as Cr 2 (CO) 6 + < Cr 2 (CO) Table 1. This order is consistent with the reverse order of the metal-metal bond strength and the trend in reactivity for ligand exchange reactions, i.e.…”

supporting

confidence: 90%

“…3 A very interesting aspect of the ligand exchange reactions for Cr 2 (CO) y + ( y = 4-6) was demonstrated by Sellers-Hahn and Russell. 7 The branching ratios for reactions involving metal-metal bond cleavage increase as the metal-to-ligand ratio decreases. In addition, the ratio for simple ligand exchange to metal-metal bond cleavage is strongly dependent upon the nature of the reacting ligand.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the ratio for simple ligand exchange to metal-metal bond cleavage is strongly dependent upon the nature of the reacting ligand. 7 In general, the variation in the physical and chemical properties of M x (CO) y + clusters, as the degree of ligation is varied around the metal centers, is of considerable interest. From this point of view, an important factor in characterizing these species is the bond dissociation energy of the individual metal-metal and metal-ligand bonds measured as a function of cluster size as well as a function of metal-to-ligand ratio.…”

Section: Introductionmentioning

confidence: 99%

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Collision-induced dissociation of Cr2(CO)y+ (y = 4–7)

Markin¹,

Sugawara²

1999

Eur. J. Mass Spectrom.

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Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry has been applied to the study of energy-resolved collisioninduced dissociation of Cr 2 (CO) y + (y = 4-7) prepared during the clustering reactions initiated by the dissociative ionization of Cr(CO) 6. Mass-selected precursor ions were activated by translational energy-controlled collisions with helium. Threshold curves for the dissociation products were analyzed using model functions convoluted with a Doppler broadening distribution function. For one CO ligand loss from Cr 2 (CO) 4 + , Cr 2 (CO) 5 + and Cr 2 (CO) 7 + , the threshold values were determined to be 1.26 ± 0.11, 1.92 ± 0.16 and 1.35 ± 0.12 eV, respectively, at 298 K. In the case of Cr 2 (CO) 6 + , the lowest energy channel was chromium ion elimination with a threshold of 1.47 ± 0.12 eV.

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supporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Collision-induced dissociation of Cr2(CO)y+ (y = 4–7)

Markin¹,

Sugawara²

1999

Eur. J. Mass Spectrom.

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“…5 ' 2 1 *" 2 4 The unsaturated dimetal ions [Cr 2 (CO)J + (n = 0-6) are observed in electron-impact ionization and other mass spectrometric studies on [Cr(CO) 6 ]. 225 ' 226 …”

Section: Charged Carbonyl Complexesmentioning

confidence: 99%