Kinetics of phosphine substitution in CpRu(PPh3)2X (X = Cl, Br, I, N3, and NCO)

被引:7
|
作者
Hill, David [1 ]
Delaney, Connor [1 ]
Clark, Miles [1 ]
Eaton, Mathew [1 ]
Hassan, Bakar [1 ]
Hendricks, Olivia [2 ]
Dang, Duy Khoi [1 ]
Kirss, Rein U. [1 ]
机构
[1] Northeastern Univ, Dept Chem & Chem Biol, Boston, MA 02115 USA
[2] Wellesley Coll, Dept Chem, Wellesley, MA 02481 USA
来源
RSC ADVANCES | 2017年 / 7卷 / 55期
关键词
METAL-CARBONYL DERIVATIVES; CYCLOPENTADIENYL-RUTHENIUM; ETA-CYCLOPENTADIENYLRUTHENIUM; LIGAND DISSOCIATION; CRYSTAL-STRUCTURES; OSMIUM CHEMISTRY; HALOGEN EXCHANGE; COMPLEXES; ALKYNES; REACTIVITY;
D O I
10.1039/c7ra02793a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The kinetics of phosphine substitution in CpRu(PPh3)(2)X (X = Br, 1b, X = I, 1c, X = N-3, 1d, and X = NCO, 1e) have been measured under pseudo-first order conditions in THF solution and compared with data for CpRu(PPh3)(2)X (1a). The relative rate of substitution is found to be 1a > 1d > 1b > 1e > 1c. Substitution rates decrease in the presence of added PPh3 and are independent of added X consistent with a dissociative process. Activation parameters for 1a-1c (Delta H-dagger = 113-135 kJ mol(-1), Delta S 21-102 J mol(-1) K-1) and DFT calculations support a dissociative or dissociative interchange pathway even though negative activation entropies (Delta S-dagger = -48 +/- 16 to -105 +/- 5 J mol(-1) K-1) are observed for 1d-e. Differences in Ru-ligand bond angles in 1d-e point to different pi-acceptor properties of the pseudohalide ligands, contributing to the faster rate of substitution for the azide complexes, 1d relative to the cyanate derivative 1e. Substitution is not observed when X = F, 1f, X = H, 1g, X = SnF3, 1h, or X = SnCl3, 1i. Compounds 1b-1e also react with chloroform to yield 1a. The rates of halide exchange are comparable to phosphine substitution for 1c and 1d. The latter reaction is inhibited by excess triphenylphosphine and is unaffected by both radical inhibitors and radical traps suggesting that a radical mechanism is unlikely.
引用
收藏
页码:34425 / 34434
页数:10
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