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1.
Treatment of [Ru(CHCHCH2PPh3)X(CO)(PPh3)2]+ (X=Cl, Br) with KTp (Tp=hydridotris(pyrazolyl)borate) and NaBPh4 produced [TpRu(CHCHCH2PPh3)(CO)(PPh3)]BPh4. Reaction of RuHCl(CO)(PPh3)3 with HCCCH(OEt)2 produced Ru(CHCHCH(OEt)2)Cl(CO)(PPh3)2, which reacted with KTp to give TpRu(CHCHCHO)(CO)(PPh3). Treatment of [TpRu(CHCHCH2PPh3)(CO)(PPh3)]BPh4 with NaN(SiMe3)2 and benzaldehyde produced TpRu(CHCHCHCHPh)(CO)(PPh3). The later complex was also produced when TpRu(CHCHCHO)(CO)(PPh3) was treated with PhCH2PPh3Cl/NaN(SiMe3)2. The bimetallic complex [TpRu(CO)(PPh3)]2(μ-CHCHCHCHC6H4CHCHCHCH) was obtained from the reaction of [TpRu(CHCHCH2PPh3)(CO)(PPh3)]BPh4 with NaN(SiMe3)2 and terephthaldicarboxaldehyde.  相似文献   

2.
The use of diethynylsilane, diethynyldisilane and diethynyldisiloxane in the synthesis of some linked metal carbonyl clusters is demonstrated. New dimeric η2-diyne complexes of cobalt [{Co2(CO)6}22-diyne)], ruthenium [{(μ-H)Ru3(CO)9}2322-diyne)] and osmium [{(μ-CO)Os3(CO)9}232-diyne)] {diyne=HC≡CSi(CH3)2C≡CH, HC≡CSi(CH3)2–Si(CH3)2C≡CH, HC≡CSi(CH3)2–O–Si(CH3)2C≡CH or HC≡CSi(Ph)2C≡CH} have been prepared in good yields from the reaction of [Co2(CO)8], [Ru3(CO)12] and [Os3(CO)10(NCMe)2] with half an equivalent of the appropriate diyne ligand, respectively. All the twelve compounds have been characterized by IR and 1H NMR spectroscopies and mass spectrometry. The molecular structures of eight of them have been determined by X-ray crystallography. Structurally, each of the tetracobalt species displays two Co2C2 cores adopting the pseudo-tetrahedral geometry with the alkyne bond lying essentially perpendicular to the Co–Co vector. For the group 8 ruthenium and osmium analogues, the hexanuclear carbonyl clusters consist of two trinuclear metal cores with the μ322 bonding mode for the acetylene groups in the former case and μ3-(η2-||) bonding mode in the latter one. Density functional theory was employed to study the electronic structures of these molecules in terms of the nature of the silyl or disilyl unit and its substituents.  相似文献   

3.
The reaction of complex [μ-SCH(CH3)CH(CH3)S-μ]Fe2(CO)6 (1) with trans-1,2-bis(diphenylphosphino)ethylene (trans-dppv) in the presence of Me3NO?2H2O in CH2Cl2/CH3CN afforded complex {[μ-SCH(CH3)CH(CH3)S-μ]Fe2(CO)5}2(trans-dppv) (2) with a bridging dppv. Complex [μ-SCH(CH3)CH(CH3)S-μ]Fe2(CO)4(cis-dppv) (3) was prepared by the reaction of 1 with cis-dppv and Me3NO?2H2O. The new complexes 2 and 3 were characterized by elemental analysis, spectroscopy, and X-ray diffraction analysis.  相似文献   

4.
The reaction between Ru3(μ-H){μ3-C2CPh2(OH)}(CO)9 and HCCPh, carried out in the presence of HBF4 · Me2O, afforded the cluster complexes Ru3(μ-H)(μ3-CPh2CCCCPh)(CO)9 (5) and Ru33-CPhCHCC(CPh2)CHCPh}(μ-CO)(CO)8 (6), both of which were characterised by single-crystal X-ray studies.  相似文献   

5.
Abstract

The reaction of dipropargylether with Mo2(C5H4R)2(CO)4 (R = H, COOCH2CH3), prepared by refiuxing a toluene solution of Mo2(C5H4R)2(CO)6 (R = H, COOCH2CH3), gave dinuclear cluster complexes (HC2CH2OCH2C2H-μ)[Mo2(C5H4R)2(CO)4] [(1): R = H, (2): R = COOCH2-CH3] and tetranuclear cluster complexes [Mo2(C5H4R)2(CO)4](μ-HC2CH2OCH2C2H-μ) [Mo2(C5H4R)2(CO)4] [(3): R = H, (4): R = COOCH2CH3], respectively. When (1) or (2) was treated with an equimolar amount of octacarbonyldicobalt, the new novel tetranuclear cluster complexes [Co2CO)6](μ-HC2CH2OCH2C2H-μ)(Mo2(C5H4R)2(CO)4] [(5): R = H, (6): R = COOCH2CH3] were obtained. These complexes were characterized by elemental analysis, IR and 1H NMR spectra. The molecular structure of complex (3 1/2CH2C12) was determined by single-crystal X-ray diffraction methods.  相似文献   

6.
We report the synthesis of some heterobimetallic carbonyl clusters of groups 8 and 9 derived from diethynylsilane and diethynyldisilane ligands. The triosmium carbonyl clusters containing a pendant acetylene unit [(μ-CO)Os3(CO)932-HC≡C-E-C≡CH)] [E = Si(CH3)2, Si(CH3)2–Si(CH3)2 and SiPh2] were prepared and subsequently used for mixed-metal cluster formation. New diyne complexes of the type [{(μ-CO)Os3(CO)9}{Co2(CO)6}(μ322-diyne)] and [{(μ-CO)Os3(CO)9}{(μ-H)Ru3(CO)9}(μ3232, η2-diyne)] [diyne = HC≡CSi(CH3)2C≡CH, HC≡CSi(CH3)2–Si(CH3)2C≡CH or HC≡CSi(Ph)2C≡CH] have been prepared in good yields from the reaction of [(μ-CO)Os3(CO)932-HC≡C-E-C≡CH)] with a molar equivalent of [Co2(CO)8] and [Ru3(CO)12], respectively. All the new heterobimetallic compounds have been characterized by IR and 1H NMR spectroscopy and mass spectrometry. The X-ray crystal structures and computational analyses based on density functional theory of these three molecules have been studied. Structurally, the dicobalt species adopts a pseudo-tetrahedral Co2C2 core with the alkyne bond which lies essentially perpendicular to the Co–Co vector. For the mixed osmium–ruthenium analogue, the hexanuclear carbonyl cluster consist of two trinuclear metal cores with the μ3-(η2-||) bonding mode for the acetylene group in the former case and the μ32, η2 bonding mode in the latter one.  相似文献   

7.
The thiamacrocycle [Co2{μ-C2(CH2SCH2CH2)2S}(CO)6] reacts with Ag[BF4] and PPh3 to afford the fluxional compound [Co2{μ-C2(CH2SCH2)2S}(CO)6(AgPPh3)][BF4], the structure of which has been established by X-ray crystallography, and with [Cu(CH3−CN)4][PF6] to afford [Co2{μ-C2(CH2SCH2CH2)2S}(CO)6(CuCH3−CN)][PF6], which undergoes phosphine sustitution.  相似文献   

8.
Addition of pentafluorothio bromide, SF5Br, to ethyl propiolate results in an 1:1 adduct, SF5CHCBrC(O)OC2H5, and a small amount of a 1:2 adduct. The former is converted by reduction to the corresponding β-SF5-acrylic ester, SF5CHCHC(O)OC2H5. Treatment of SF5CH2CBr(CH3)C(O)OCH3 with base produces methyl-β-SF5-methacrylate, SF5CHC(CH3)C(O)OCH3. The preparation and characterization of these new compounds are described.  相似文献   

9.
The tetrameric Cu(β-diketonate) alkoxide complex [Cu(thd)(OCH2CH2OCH3)]4 (thd = 2,2,6,6-tetramethyl-3,5-heptanedionate; 1a ) reacts with the alkaline earth metal alkoxides [M(OCH2CH2OCH3)2] (M = Ca, 2a ; M = Sr, 2b ; M = Ba, 2c ) to yield the heteronuclear compounds [Cu2M(thd)3(OCH2CH2OCH3)3] (M = Ca, 6a ; M = Sr, 6b ). These heterometallic complexes were also obtained in the reaction of 1a and the mixed Ca and Sr complexes of β-diketonate-alkoxide [Mx(thd)y(OCH2CH2OCH3)2x?y] (M = Ca, x = 7, y = 6, 3 ; M = Sr, x = 5, y = 3, 4 ), respectively. In comparison, 1a reacts with the analogous [Ba(thd)(OCH2CH2OCH3)] ( 5a ) to yield a[Ba2Cu2(thd)4(OCH3)4(HOCH2CH2OCH3)2] species ( 8a .) The in situ prepared mixed-ligand Ba Compounds [Ba(thd)OR)] (R = CH2CH2OCH2CH2OCH3, ( 5b ); R = CH2CH2CH2OCH3 ( 5c ) react with the corresponding Cu complexes [Cu(thd)(OR)]n (R = CH2CH2OCH2CH2OCH3), n = 4 ( 1b ); R = CH2CH2OCH2CH2OCH3 ( 8b ); R = CH2CH2CH2OCH3 ( 8c ). However, [Cu(hfd)(OCH2CH2OCH3)]4 (hfd = 1,1,1,5,5,5,-hexafluoroacetylacetonate; 1e ) is converted in the presence of 2a–c to the simple metathesis products [M(hfd)2] (M = Ca, Sr, Ba) and [Cu(OCH2CH2OCH3)2]. Crystalline [Ba2Cu2(hfd)2(thd)2(OCH2CH2CH2OCH3)4(HOCH2CH2CH2OCH3)2] ( 9 ) was isolated from the reaction of 1a with in situ prepared [Ba((hfd)OCH2CH2CH2OCH3)] ( 5d ) in 2-, methoxyethanol. X-Ray crystallographic structure determinations are reported for 6a , 6b , 8b , and 8c .  相似文献   

10.
《Polyhedron》1988,7(4):315-322
The electrochemical oxidation of trans-Rh2(μ-dppm)2(CO)2Cl2 (dppm = bis (diphenylphosphino)methane) in the presence of chloride has afforded the new dirhodium(II) unsymmetrical complex Rh2(μ-dppm)2(μ-Cl)(CO)Cl3 which is readily converted to the complex [Rh2(μ-dppm)2(μ-Co)(μ-Cl)Cl2]PF6. This species has been shown to undergo addition reactions with chloride to regenerate [Rh2(μ-dppm)2(μ-Cl)Cl3(CO)], and with carbon monoxide and t-butylisocyanide to give the additional new dirhodium(II) complexes [Rh2(μ-dppm)2(μ-Cl)Cl2(CO)2]PF6 and [Rh2(μ-dppm)2(μ-Cl)(CNC(CH3)3)2Cl2]PF6, respectively. During prolonged exposure to carbon monoxide [Rh2(μ-dppm)2(μ-Co)(μ-Cl)Cl2]PF6 undergoes reduction with the loss of chloride to give [Rh2(μ-dppm)2(μ-Cl)(CO)2]PF6.  相似文献   

11.
The synthesis and X‐ray crystal structure of two new multinuclear thorium complexes are reported. The tetranuclear μ4‐oxo cluster complex Th44‐O)(μ‐Cl)2I62(O,O’)‐μ‐O(CH2)2OCH3]6 and the dinuclear complex Th2I52(O,O’)‐μ‐O(CH2)2OCH3]3(DME) (DME=dimethoxyethane) are formed by C?O bond activation of 1,2‐dimethoxyethane (DME) mediated by thorium iodide complexes.  相似文献   

12.
Four new butterfly Fe/S cluster complexes bearing 2,6-(CH2)2C5H3N or (CH2)2 groups, as the active site models of [FeFe]-hydrogenase, have been prepared by condensation reaction and structurally characterized. Treatments of the parent complex Fe2(CO)6[(μ-SCH2)2CHCO2H] (A) with 2,6-(HOCH2)2C5H3N or HOCH2CH2OH in the presence of 4-dimethylaminopyridine and dicyclohexylcarbodiimide afforded the single-butterfly Fe/S complexes Fe2(CO)6[(μ-SCH2)2CHC(O)OCH2(2,6-C5H3N)CH2OH] (1) and Fe2(CO)6[(μ-SCH2)2CHC(O)OCH2CH2OH] (3) and the double-butterfly Fe/S complexes [Fe2(CO)6(μ-SCH2)2CHC(O)OCH2]2(2,6-C5H3N) (2) and [Fe2(CO)6(μ-SCH2)2CHC(O)OCH2]2 (4). The new complexes 14 were fully characterized by elemental analysis, ESI-MS, IR, and 1H (13C) NMR spectroscopy.  相似文献   

13.
The new alkoxysilyl-functionalized alkynes [HC≡CCH2N(H)C(=O)N(H)(CH2)3Si(OEt)3] and [HC≡C(C6H4)–N(H)C(=O)N(H)(CH2)3Si(OEt)3] have been synthesized using literature methods. These have been reacted with Fe3(CO)12, Ru3(CO)12 and Co2(CO)8. With the iron carbonyl only decomposition was observed: with Ru3(CO)12 splitting of the alkynes into their parent components and formation of the complexes (μ-H)Ru3(CO)9[HC=N(CH2)3Si(OEt)3], (μ-H)Ru3(CO)9[C–C(C6H4)NH2] and (μ-H)2Ru3(CO)9[HC–CCH3] occurred. Finally, with Co2(CO)8 formation of complexes Co2(CO)6(HC2R) R=(C6H4)NH2, CH2NH(CO)NH(CH2)3Si(OEt)3, (C6H4)NH(CO)NH(CH2)3Si(OEt)3 containing the intact alkynes could be obtained.  相似文献   

14.
The novel tetrahedral clusters (μ3-CR)Co2M(CO)85-Ind) (M=Mo,W; R=H, CH3, C6H5, COOC2H5) 5-12 containing the indenyl ligand were isolated from reactions of tricobalt clusters (μ3-CR)Co3(CO)9 (R=H, CH3, C6H5, COOC2H5) and K(η5-Ind)M(CO)3 (M=Mo,W) under mild conditions. The cluster complex (μ3-CC6H5)CoMo2(CO)75-Ind)(η5-Cp (Cp*=C5H4C(O)CH3) 16 was obtained via the stepwise metal exchange reaction of complex (μ3-CC6H5)Co2Mo(CO)85-Ind) 9 with Na(η5-CpMo(CO)3, but the reaction of (μ3-CC6H5)Co2Mo(CO)85-Cp*) 15 with K(η5-Ind)Mo(CO)3 yielded only 9. The crystal structures of compounds 7, 9 and 13 were established by single crystal X-ray diffraction methods and show structural evidence for “slippage” of the indenyl ring.  相似文献   

15.
Acyl and Alkylidenephosphines. XlX. Molecular and Crystal Structure of 2,4-Bis (dimethyl-amino) ?1,3-diphenyl-l, 3-diphosphetane 4-Methyl-1,2,6-triarsa-tricyclo[2.2.1.02.6]-heptan, CH3C(CH2As)3, ( 1 ) reacts with Ru3(CO)12 to the presumable polymeric [Ru(CO)4CH3C(CH2As)3]n ( 2 ), while no reaction takes place with Os3(CO)12·Os3(CO)11CH3CN forms with 1 at ?20°C Os6(CO)21CH2As)3 ( 3 ). The reaction of 1 and Co2(CO)8 yields [Co2(CO)6CH3C(CH2As)3]n ( 4 ). 1 and Ir(CO)2(p-CH3C6H4NH2)Cl reacts in THF solution to [{Ir(CO)(THF]Cl}3{CH3C(CH2As)3}2] ( 5 ), which contains a μ3-(η21O) carbonmonoxide. Upon treatment of [(μ-Cl)Ir(C8H12)]2 with 1 [{Ir(C8H12)Cl}9{CH3C(CH2As)3}7] ( 6 ) is obtained. The reaction of 1 with Ir(CO)(PPh3)2Cl yields in THF [Ir(CO)(PPh3)(Cl)CH3C(CH2As)3]2 · THF ( 7a ). Heating of 7a in CH2Cl2 leads to the formation of [Ir(CO)(PPh3)(Cl)CH3C(CH2As)3 · CH2Cl2]2 ( 7b ). Pt(PPh3)3 reacts with 1 in THF to give [Pt(PPh3)CH3C(CH2As)3]2 · THF ( 8 ). The novel compounds are mostly insoluble or slightly soluble. They are characterized by elemental and thermogravimetric analysis, IR and, as far as possible, Raman and NMR Spectra. The results indicate that 1 react with the d8, d9, and d10 systems of the VIIIb metals under oxidative additions.  相似文献   

16.
A general synthesis of alkene-carbene complexes of tungsten, chromium and rhenium, containing a six-membered ring system, is outlined and the crystal structure of two new complexes of this type, (CO)4WC(OEt)(CH)(η2-CH2CHCH2) (CH2CHCH2) and (CO)9Re2(OCH2CH3(CH2(CH2(CH2CHCH2), is described.  相似文献   

17.
Alkoxide and carbonyl ligands complement each other because they both behave as “π buffers” to transition metals. Alkoxides, which are π donors, stabilize early transition metals in high oxidation states by donating electrons into vacant dπ orbitals, whereas carbonyls, which are π acceptors, stabilize later transition elements in their lower oxidation states by accepting electrons from filled dπ orbitals. Both ligands readily form bridges that span M? M bonds. In solution fluxional processes that involve bridge–terminal ligand exchange are common to both alkoxide and carbonyl ligands. The fragments [W(OR)3], [CpW(CO)2], [Co(CO)3], and CH are related by the isolobal analogy. Thus the compounds [(RO)3W ? W(OR)3], [Cp(CO)2W?W(CO)2Cp], hypothetical [(CO)3Co?Co(CO)3], and HC?CH are isolobal. Alkoxide and carbonyl cluster compounds often exhibit striking similarities with respect to substrate binding—e.g., [W33-CR)(OR′)9] versus [Co33-CR)(CO)9] and [W4(C)(NMe)(OiPr)12] versus [Fe4(C)(CO)13]—but differ with respect to M? M bonding. The carbonyl clusters use eg-type orbitals for M? M bonding whereas the alkoxide clusters employ t2g-type orbitals. Another point of difference involves electronic saturation. In general, each metal atom in a metal carbonyl cluster has an 18-electron count; thus, activation of the cluster often requires thermal or photochemical CO expulsion or M? M bond homolysis. Alkoxide clusters, on the other hand, behave as electronically unsaturated species because the π electrons are ligand-centered and the LUMO metal-centered. Also, access to the metal centers may be sterically controlled in metal alkoxide clusters by choice of alkoxide groups whereas ancillary ligands such as tertiary phosphanes or cyclopentadienes must be introduced if steric factors are to be modified in carbonyl clusters. A comparison of the reactivity of alkynes and ethylene with dinuclear alkoxide and carbonyl compounds is presented. For the carbonyl compounds CO ligand loss is a prerequisite for substrate uptake and subsequent activation. For [M2(OR)6] compounds (M = Mo and W) the nature of substrate uptake and activation is dependent upon the choice of M and R, leading to a more diverse chemistry.  相似文献   

18.
The trimetallic clusters [Ru3(CO)10(dppm)], [Ru3(CO)12] and [RuCo2(CO)11] react with a number of multifunctional secondary phosphine and tertiary arsine ligands to give products consequent on carbonyl substitution and, in the case of the secondary phosphines, PH activation. The reaction with the unresolved mixed P/S donor, 1-phenylphosphino-2-thio(ethane), HSCH2CH2PHPh ( LH2), gave two products under various conditions which have been characterised by spectroscopic and crystallographic means. These two complexes [Ru3(μ-dppm)(H)(CO)7(LH)] and [Ru3(μ-dppm)(H)(CO)8(LH)Ru3(μ-dppm)(CO)9], show the versatility of the ligand, with it chelating in the former and bridging two Ru3 units in the latter. The stereogenic centres in the molecules gave rise to complicated spectroscopic data which are consistent with the presence of diastereoisomers. In the case of [Ru3(CO)12] the reaction with LH2 gave a poor yield of a tetranuclear butterfly cluster, [Ru4(CO)10(L)2], in which two of the ligands bridge opposite hinge wingtip bonds of the cluster. A related ligand, HSCH2CH2AsMe(C6H4CH2OMe), reacted with [RuCo2(CO)11] to give a low yield of the heterobimetallic Ru-Co adduct, [RuCo(CO)6(SCH2CH2AsMe(C6H4CH2OMe))], which appears to be the only one of its type so far structurally characterised.The secondary phosphine, HPMe(C6H4(CH2OMe)) and its oxide HP(O)Me(C6H4(CH2OMe)) also react with the cluster [Ru3(CO)10(dppm)] to give carbonyl substitution products, [Ru3(CO)5(dppm)(μ2-PMe(C6H4CH2OMe))4], and [Ru3H(CO)7(dppm)(μ21-P(O)Me(C6H4CH2OMe))]. The former consists of an open Ru3 triangle with four phosphide ligands bridging the metal-metal bonds; the latter has the O atom symmetrically bridging one Ru-Ru bond, the P atom being attached to a non-bridged Ru atom.  相似文献   

19.
Four diiron dithiolate complexes with monophosphine ligands have been prepared and structurally characterized. Reactions of (μ-SCH2CH2S-μ)Fe2(CO)6 or [μ-SCH(CH3)CH(CH3)S-μ]Fe2(CO)6 with tris(4-chlorophenyl)phosphine or diphenyl-2-pyridylphosphine in the presence of Me3NO·2H2O afforded diiron pentacarbonyl complexes with monophosphine ligands (μ-SCH2CH2S-μ)Fe2(CO)5[P(4-C6H4Cl)3] (1), (μ-SCH2CH2S-μ)Fe2(CO)5[Ph2P(2-C5H4N)] (2), [μ-SCH(CH3)CH(CH3)S-μ]Fe2(CO)5[P(4-C6H4Cl)3] (3), and [μ-SCH(CH3)CH(CH3)S-μ]Fe2(CO)5[Ph2P(2-C5H4N)] (4) in good yields. Complexes 14 were characterized by elemental analysis, 1H NMR, 31P{1H} NMR and 13C{1H} NMR spectroscopy. Furthermore, the molecular structures of 14 were confirmed by X-ray crystallography.  相似文献   

20.
The fluorocarbon soluble, binuclear ruthenium(I) complexes [Ru(μ-O2CMe)(CO)2LF]2, where LF is the perfluoroalkyl substituted tertiary phosphine, P(C6H4-4-CH2CH2(CF2)7CF3)3, or P(CH2CH2(CF2)5CF3)3, were synthesized and partition coefficients for the complexes in fluorocarbon/hydrocarbon biphases were determined. Catalytic hydrogenation of acetophenone to 1-phenylethanol in benzotrifluoride at 105 °C occured in the presence of either [Ru(μ-O2CMe)(CO)2P(C6H4-4-CH2CH2(CF2)7CF3)3]2 (1) or [Ru(μ-O2CMe)(CO)2P(CH2CH2(CF2)5CF3)3]2 (2). The X-ray crystal structure of [Ru(μ-O2CMe)(CO)2P(CH2CH2(CF2)5CF3)3]2 was determined. The compound exhibited discrete regions of fluorous and non-fluorous packing.  相似文献   

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