Dicarbonylcyclopentadienyliridium, (η-C5H5)Ir(CO)2, as a ligand

1999 ◽  
Vol 77 (8) ◽  
pp. 1327-1335 ◽  
Author(s):  
Faming Jiang ◽  
Kumar Biradha ◽  
Weng Kee Leong ◽  
Roland K Pomeroy ◽  
Michael J Zaworotko
Keyword(s):  
Crystal Structures ◽  
Time Scale ◽  
Room Temperature ◽  
Donor Ligand ◽  
Carbonyl Ligands ◽  
Metal Bond ◽  
Metal Metal

The following complexes, in which CpIr(CO)2 acts as a 2e donor ligand, have been prepared: Cp(OC)2IrW(CO)5 (1), Cp(OC)2IrRu(CO)3(SiCl3)2, Cp(OC)2IrOs(CO)3(GeCl3)(Cl) (2), Cp(OC)2IrOs(CO)3(X)2 (X = Cl, Br (3), I). The characterization of the complexes included the crystal structures of 1, 2, and 3, which reveal that all contain an unbridged metal-metal bond. The carbonyl ligands of 1 in solution undergo exchange on the NMR time scale above -40°C. With the exception of 2, all the complexes dissociate in solution at room temperature, some rapidly so. Only in the case of 3 is an equilibrium with the dissociation products established. The results indicate that CpIr(CO)2 is a weak ligand.Key words: tungsten, osmium, iridium, binuclear.

Distorted chiolite crystal structures of α-Na5M3F14 (M=Cr,Fe,Ga) studied by X-ray powder diffraction

2003 ◽  
Vol 18 (2) ◽  
pp. 128-134 ◽  
Author(s):  
A. Le Bail ◽  
A.-M. Mercier
Keyword(s):  
Crystal Structures ◽  
Powder Diffraction ◽  
Room Temperature ◽  
Rietveld Refinements ◽  
Space Group ◽  
X Ray ◽  
Precise Characterization

The crystal structures of the chiolite-related room temperature phases α-Na5M3F14 (MIII=Cr,Fe,Ga) are determined. For all of them, the space group is P21/n, Z=2; a=10.5096(3) Å, b=7.2253(2) Å, c=7.2713(2) Å, β=90.6753(7)° (M=Cr); a=10.4342(7) Å, b=7.3418(6) Å, c=7.4023(6) Å, β=90.799(5)° (M=Fe), and a=10.4052(1) Å, b=7.2251(1) Å, c=7.2689(1), β=90.6640(4)° (M=Ga). Rietveld refinements produce final RF factors 0.036, 0.033, and 0.035, and RWP factors, 0.125, 0.116, and 0.096, for MIII=Cr, Fe, and Ga, respectively. The MF6 polyhedra in the defective isolated perovskite-like layers deviate very few from perfect octahedra. Subtle octahedra tiltings lead to the symmetry decrease from the P4/mnc space group adopted by the Na5Al3F14 chiolite aristotype to the P21/n space group adopted by the title series. Facile twinning precluded till now the precise characterization of these compounds.

Synthesis and characterization of a confacial bioctahedral tantalum(II) dimer with a formal triple metal-metal bond

1986 ◽  
Vol 108 (12) ◽  
pp. 3538-3539 ◽  
Author(s):  
F. Albert. Cotton ◽  
Michael P. Diebold ◽  
Wieslaw J. Roth
Keyword(s):  
Synthesis And Characterization ◽  
Metal Bond ◽  
Metal Metal

Unexpected Formation of a Weak Metal−Metal Bond:  Synthesis, Electronic Properties, and Second-Order NLO Responses of Push−Pull Late−Early Heteronuclear Bimetallic Complexes with W(CO)3(1,10-phenanthroline) Acting as a Donor Ligand

2003 ◽  
Vol 22 (20) ◽  
pp. 4001-4011 ◽  
Author(s):  
Maddalena Pizzotti ◽  
Renato Ugo ◽  
Claudia Dragonetti ◽  
Elisabetta Annoni ◽  
Francesco Demartin ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Second Order ◽  
Bimetallic Complexes ◽  
Unexpected Formation ◽  
Donor Ligand ◽  
Metal Bond ◽  
Metal Metal

Reversible metal-metal bond cleavage accompanied by a geometrical isomerism. Synthesis and crystal structures of isomers of [Rh(.mu.-(Me3C)2P)(CO)2]2. Catalysis of alkene hydroformylation

1983 ◽  
Vol 2 (3) ◽  
pp. 470-472 ◽  
Author(s):  
Richard A. Jones ◽  
Thomas C. Wright ◽  
Jerry L. Atwood ◽  
William E. Hunter
Keyword(s):  
Crystal Structures ◽  
Bond Cleavage ◽  
Metal Bond ◽  
Metal Metal ◽  
Geometrical Isomerism

A novel metal-chain extension reaction: synthesis of (X)[Os(CO)3(CN-t-Bu)]nMn(CO)5 (X = Cl, Br, I; n = 1, 2, 3)

2002 ◽  
Vol 80 (3) ◽  
pp. 281-291 ◽  
Author(s):  
Faming Jiang ◽  
Hilary A Jenkins ◽  
David F Green ◽  
Glenn PA Yap ◽  
Roland K Pomeroy
Keyword(s):  
Room Temperature ◽  
Chain Extension ◽  
Reverse Direction ◽  
Mechanism Of Formation ◽  
Carbonyl Ligand ◽  
Major Isomer ◽  
Metal Metal ◽  
Halide Ligand ◽  
Metal Chain

Complexes of formula (X)[Os(CO)3(CN-t-Bu)]nMn(CO)5 (X = Cl, Br, I; n = 1, 2, 3) have been prepared by the reaction of Os(CO)4(CN-t-Bu) with Mn(CO)5(X) in hexane at room temperature. The characterization of the complexes included the crystal structures of compounds with X = I, n = 1, 3 and X = Cl, Br, n = 2 (2ClA and 2BrB). The trinuclear products were isolated as two isomers. The major isomer (2XA) has an isocyanide ligand attached to each osmium atom, whereas the minor isomer (2XB) has both of these ligands bound to the terminal Os atom. The structures contain OsnMn chains with unbridged Os—Mn bonds (range of lengths are 2.870(1)–2.9245(8) Å) and for compounds with n = 2 or 3 Os—Os bonds (range of lengths are 2.8812(4)–2.8928(5) Å). The mechanism of formation is believed to involve replacement of a CO ligand with the 18e- ligand Os(CO)4(CN-t-Bu) at the metal with the coordinated halide, followed by a rearrangement in which the halide ligand migrates to the donor Os atom with concomitant migration in the reverse direction of a carbonyl ligand. The preparation of (OC)4(t-BuNC)OsMn(CO)4(Cl) with an Os–Mn dative bond is also reported along with the (OC)4(t-BuNC)OsRe(CO)4(X) analogues.Key words: manganese–osmium, rhenium–osmium, dinuclear, metal chain, dative metal–metal bond.

ChemInform Abstract: Syntheses and Characterization of γ-(SiW10M2S2O38)6- (M: MoV, WV) . Two Keggin Oxothio Heteropolyanions with a Metal-Metal Bond.

ChemInform ◽  
2010 ◽  
Vol 27 (35) ◽  
pp. no-no
Author(s):  
E. CADOT ◽  
V. BEREAU ◽  
B. MARG ◽  
S. HALUT ◽  
F. SECHERESSE
Keyword(s):  
Metal Bond ◽  
Metal Metal
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