A π-Cyclopropenyl Derivative of Nickel Carbonyl

Synthesis and structure of a novel perchlorinated organonickel complex containing a bridging trichloropropenyl ligand

“…Examination of the bond lengths within the Ni4Cl2 ring gives no indication of extremely short, multiply-bonded, nickel atoms even though a crude electron count demonstrates that the nickel atoms are electron deficient. The independent Ni-Ni bonds bridged by the trichloropropenyl ligands are 2.528 (1) and 2.544 (1) Á16 and are long when compared with those of Figure 2. Alternate view of the [NÍ2(CO)2(m2-CjC13)(ui-CI)] cluster displaying the orthogonality of the C3CI3 and Ni4CI2 fragments.…”

Pyrazoles and imidazoles as ligands. XIV. Crystal and molecular structure of dibromotetrakis(5-methylpyrazole)manganese(II), Mn(C4H6N2)4Br2

“…6,8 Scattering factors for neutral nitrogen and carbon were taken from ref 9; scattering factors for hydrogen were taken from Stewart, et At this stage the absorption correction was applied to the diffraction data. * Two sets of hydrogens were used for C ( 5 ) and C(8) to allow for disorder; the first three hydrogens correspond to the first set. Three new cycles of least-squares refinement, applying anisotropic thermal parameters for Mn and Br, yielded Rr = 0.062 ( R w p = 0.081).…”

Reaction of [M(CO)4]− (M=Ir, Rh) with cyclopropenyl tetrafluoroborate – Ring opening and coupling of cyclopropenyl ligands to form dinuclear metal complexes

“…We were thus interested in extending our study to cyclopropenyltricarbonyliridium with the view that it may be possible to create greater steric crowding around the metal centre through the incorporation of a larger number of ligands. Compounds such as those shown in Chart 1 can be synthesized via the reaction of cyclopropenyl cation or halide with anionic or neutral metal complexes [4][5][6], although ring opening reactions with some transition metal complexes are also known; a common product is the g 3 -oxycyclobutenyl complex which may be formed via CO insertion [7].…”