Alkyne-substituted homo- and heterometallic carbonyl clusters of the iron, cobalt and nickel triads

Transition Metal—Main Group Cluster Compounds

“…(59,60) The structural relationship that exists between HRu3-(CO~B2H5 and H2Ru3(CO)9C2H2 underlines the different bonding requirements of boron and carbon atoms. The organometallic cluster exists in two isomeric forms (the so-called "parallel" and "perpendicular" modes of bonding for the organic fragment as shown in Figures 12c and 12d), (52,(61)(62)(63) only one of which is mimicked by the triruthenaborane. (IS) This result illustrates the fact that each boron atom tends to populate a site in which it can use its three valence electrons to greatest effect, viz.…”

Synthesis and Structural Characterization of [Ir4(mu-CO)(CO)7{mu4-eta3-Ph2PC(H)C(Ph)PCBu t}(mu-PPh2)]: Alkyne-Phosphaalkyne Coupling and Formation of a Novel 2-phosphabutadienylphosphine Ligand

“…There are relatively few examples of alkyne-alkyne coupling reactions at polynuclear carbonyl clusters 1 , one example being the reaction between [Ir4(µ-H)(CO)9-(Ph2PC≡CPh)(µ-PPh2)] and HC≡CPh, which led to…”

Reactions of [Fe3Cp2(CO)3(μ-CO)(μ3-CO)(μ3-CF3C2CF3)] with diphosphines: X-ray structure of a complex in which two tri-iron clusters are linked only by Ph2PCH2CH2PPh2

“…1a, though crystallographically independent, display essentially identical structures which closely resemble that of their parent 1 [8]. In each tri-iron framework the alkyne is related to the Fe 3 triangle in l 3 -g 2 -parallel fashion which is the most common form of attachment of an alkyne to a M 3 triangle [9]. The Fe1-Fe2 bonds in 2 [2.650(1) and 2.654(1) Å ] are a little longer than the other Fe-Fe bonds [2.514(1)-2.528(1) Å ], a feature also found in 1.…”

“…Thus, it appears that the dppm acts in 5 as a chelating ligand after replacement of a further CO group at Fe(1). The 31 P-{ 1 H} NMR spectrum of 5 contains doublets at d 34.95 and 12.75; the absence of a highfield signal similar to that at d À25.9 in the corresponding spectrum of 4, combined with the dramatic lowering of the 2 J P-P (1), Fe-P 2.305(2) and 2.310(2), Fe1-CCF 3 2.012(6) and 2.013(6), Fe2-CCF 3 1.956 (7) and 1.960 (7), Fe3-CCF 3 1.942 (7) and 1.964 (7), Fe1-CO 1.762 (8)-1.795(8), l 3 -Fe1-CO 2.108(6) and 2.098 (7), l 3 -Fe2-CO 2.070(6) and 2.059 (7), l 3 -Fe3-CO 1.924 (7) and 1.940 (8), Fe1-C8 2.352 (7) and 2.357 (7), Fe2-C8 1.801(8) and 1.814 (7) and C2-C3 1.418(9) and 1.419 (9). 10% Probability ellipsoids are shown.…”