36477-75-5Relevant articles and documents
Donor/acceptor complexes containing ferrocenyl-pyridine ligands attached to a tungsten carbonyl centre: Structural, spectroscopic and electrochemical properties
Sakanishi, Sumika,Bardwell, David A.,Couchman, Samantha,Jeffery, John C.,McCleverty, Jon A.,Ward, Michael D.
, p. 35 - 45 (1997)
A series of ferrocenyl-pyridine ligands (Fc-L) in which a 4-pyridyl side-arm is attached to a ferrocenyl core via a conjugated linker has been attached to tungsten carbonyl cores, giving complexes of the type [(Fc-L)W(CO)5] (1-6) and [(Fc-L)2W(CO)4] (7 and 8). Three of these complexes were characterised by X-ray crystallography. Complex 2, [{Fc-C(Ph)=CH-C5H4N}W(CO)5]: triclinic, P1; a = 9.329(4), b= 12.115(3), c= 12.745(3) A; α = 66.66(2), β = 71.87(2), γ = 81.40(2)°; Z = 2; 3230 unique data; R1=0.032, wR2 = 0.090. Complex 3, [{Fc-C(Me)=CH-C5H4N}W(CO)5]: triclinic, P1; a= 11.325(3), b= 12.328(2), c= 16.639(5) A; α = 79.83(2), β = 77.30(2), γ = 82.043(14)°; Z = 4; 5878 unique data; R1 = 0.035. wR2 = 0.103. Complex 7 · (CH2Cl2)0.5, [{Fc-CH = CH-C5H4N}2W(CO)4 · (CH2Cl2)0.5]: triclinic, P1; a= 10.290(2), b = 11.751(4), c = 16.328(4) A; α = 88.071(14), β = 83.502(14), γ = 67.50(2)°; Z = 2; 5054 unique data; R1 = 0.047, wR2 = 0.125. All of the complexes were fully characterised by 1H and 13C NMR, IR, UV-vis and luminescence spectroscopy, FAB mass spectrometry, and electrochemical measurements. The complexes show the expected spectroscopic and electrochemical features for both the ferrocenyl and substituted tungsten carbonyl chromophores. Although the individual molecules possess the necessary structural and electronic features required for second-order non-linear optical behaviour, the fact that the three crystallographically characterised complexes have centrosymmetric space groups precludes bulk solid-state measurements of NLO behaviour.
Dicarbonylcyclopentadienyliridium, (η-C5H5)Ir(CO)2, as a ligand
Jiang, Faming,Biradha, Kumar,Leong, Weng Kee,Pomeroy, Roland K.,Zaworotko, Michael J.
, p. 1327 - 1335 (2007/10/03)
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.
The Formation, Structure, and Reversible Carbonylation of (?5-C5H5)MM'(CO)7(SR)) Complexes; Reactions of ((?5-C5H5)MM'(CO)8(SR)) with Hexafluorobut-2-yne
Guerchais, Jacques E.,LeQuere, Jean L.,Petillon, Francois Y.,Manojlovic-Muir, Ljubica,Muir, Kenneth W.,Sharp, David W. A.
, p. 283 - 290 (2007/10/02)
The action of heat on ((?5-C5H5)(OC)3M(μ-SR)M'(CO)5) (1) (M or M'=Cr, Mo, or W; R=Me or Ph) gives (2) containing a metal-metal bond.Photolysis of (2) in the presence of carbon monoxide regenerates (1) in an example of reversible cleavage of a M-M bond by carbon monoxide.The octacarbonyls (1) react with hexafluorobut-2-yne to give products of substitution at the (?5-C5H5)M group.The spectroscopic parameters of the complexes and crystal-structure analyses of (1a; M=M'=W, R=Me), (2b; M=Mo, M'=W, R=Me), and ((?5-C5H5)(OC)(CF3C2CF3)W(μ-SMe)W(CO)5) (5) are discussed in terms of the electronic properties of the bridging thiolato-group and the metal centres.
