24846-24-0Relevant academic research and scientific papers
Diruthenium tetracarbonyl sawhorse complexes bearing N-heterocylic carbene and phosphine ligands: Synthesis, structural characterization, and catalytic activity
Rohrabaugh, Thomas N.,Doverspike, Joshua C.,Sawyer, Evan D.,Stibbard, Mitchell R.,Malosh, Thomas J.,Geib, Steven J.
, p. 1 - 8 (2016/01/15)
A number of dinuclear ruthenium(I) sawhorse complexes substituted with an N-heterocyclic carbene or various phosphine ligands have been prepared and characterized by FT-IR, NMR, and elemental analysis. Treatment of [Ru2(μ-O2CCH3)2(CO)4]n with 2-electron donating ligands (L) yields the dimeric derivatives Ru2(μ-O2CCH3)2(CO)4L2, where L = IMes [1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene] (1), P(o-CH3C6H4)3 (2), P(C6F5)3 (3), P(c-C6H11)3 (4), and P(C6H5)3 (5). The syntheses of 1-3 are reported herein; the syntheses of 4 and 5 have been previously reported. The crystal structures of 1-3 have been determined by single crystal X-ray diffraction. Factors influencing the structures of 1-5 are discussed and compared to DFT calculated geometries. An initial assay of the catalytic activities of 1-5, employing the isomerization of 1-hexene, has been performed.
Bisoximato-verbrueckte Zweikernkomplexe des Rutheniums: Synthese und Molekuelstruktur von Ru2(CO)4(μ2-η2-ONCMe2)2(HONCMe2)2 und von Ru2(CO)4(μ2-η2-ONCMe2)22
Langenbahn, M.,Stoeckli-Evans, H.,Suess-Fink, G.
, p. 347 - 358 (2007/10/02)
The thermal reaction of Ru3(CO)12 with oximes leads with fragmentation of the trinuclear metal framework to bisoximato-bridged dinuclear complexes of the type Ru2(CO)4(μ2-η2-ONCR1R2)2L2, with L representing intact oxime ligands which, in the case of less bulky substituents R1 and R2, remain bonded as such; with sterically more demanding substituents only complexes can be isolated in which the axial oxime ligands are replaced by tripenyl phosphine.The single-crystal X-ray structure analysis of Ru2(CO)4(μ2-η2-ONCMe2)2(HONCMe2)2 (1) and of Ru2-(CO)4(μ2-η2-ONCMe2)22 (12) show a sawhorse-like arrangement of the Ru2(CO)4 backbone with C2-symmetry.In 1 intramolecular hydrogen bonds were observed between the bridging oximato and the terminal oxime ligands.
The synthesis of some binuclear ruthenium(I) complexes bridged by anionic groups. X-ray structures of pyrazolate- and oxypyridinate-bridged complexes
Sherlock, Stephen J.,Cowie, Martin,Singleton, Eric,Steyn, Margot M. de V.
, p. 353 - 368 (2007/10/02)
A series of binuclear ruthenium(I) complexes, , have been prepared by two closely related routes.Complexes 2 (XY- = S2NC3H4-) and 3 (XY- = NC5H4O-) have been prepared by the reaction of with sodium 2-mercaptothiazolinate and sodium 2-oxypyridinate, respectively.The related pyrazolate-bridged complex 4 (XY- = N2C3H3-) was prepared by the reaction of sodium pyrazolate with followed by addition of PPh3.The X-ray structures of compounds 3 and 4 have been determined.Compound 3 crystallizes in the triclinic space group P1 with a 14.766(2), b 15.821(2), c 10.745(3) Angstroem, α 98.28(2) deg, β 11.99(2) deg, γ 103.29(1) deg, V 2209.1 Angstroem3, Z = 2.On the basis of 5521 unique observations (NO) and 379 parameters varied (NV) the structure has been refined to R = 0.042 and Rw = 0.054.Compound 4 crystallizes in the orthorombic space group P212121 with a 13.220(2), b 14.864(4), c 21.403(3) Angstroem, V 4200.7 Angstroem3 and Z = 4.This structure has been refined to R = 0.041 and Rw = 0.023 for NO = 3915 and NV = 546.Both structures display the sawhorse arrangement of carbonyl groups and have the phosphine ligands in the axial positions opposite the Ru-Ru binds.For 3 the oxypyridinate groups are bound in a head-to-tail arrangement.The two-atom pyrazolate bridge imparts more strain than the three-atom oxypyridinate bridge and as a result the equatorial planes of the Ru centers are tipped by only 16.2(4) deg in 3 but by 35.4(1) deg in 4.The Ru-Ru distances (2.7108(4) Angstroem (3); 2.732(1) Angstroem (4)) correspond to normal single bonds.
