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1.
Alejandro Portugués Lydia González Dr. Delia Bautista Dr. Juan Gil-Rubio 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(35):15332-15337
The first binuclear AuI compounds containing bridging (CF2)n chains (n=4, 6, 8) and AuIII metallaperfluorocyclopentanes have been obtained by photoinitiated reactions of LAuMe (L=PPh3, PMe3, PCy3, or IPr) with α,ω-diiodoperfluorocarbons. Complexes LAu(CF2)4AuL present an unusual looped structure stabilized by an aurophilic interaction for L=PMe3, PPh3, and PCy3. The study of their dynamic behaviour has provided new insights about the strength of aurophilic interactions in solution, allowing quantification of the energy of a single Au⋅⋅⋅Au interaction. 相似文献
2.
Alejandro Portugus Lydia Gonzlez Delia Bautista Juan Gil‐Rubio 《Angewandte Chemie (International ed. in English)》2020,59(35):15220-15225
The first binuclear AuI compounds containing bridging (CF2)n chains (n=4, 6, 8) and AuIII metallaperfluorocyclopentanes have been obtained by photoinitiated reactions of LAuMe (L=PPh3, PMe3, PCy3, or IPr) with α,ω‐diiodoperfluorocarbons. Complexes LAu(CF2)4AuL present an unusual looped structure stabilized by an aurophilic interaction for L=PMe3, PPh3, and PCy3. The study of their dynamic behaviour has provided new insights about the strength of aurophilic interactions in solution, allowing quantification of the energy of a single Au???Au interaction. 相似文献
3.
Mixed‐ligands hydride complexes [RuHCl(CO)(PPh3)2{P(OR)3}] ( 2 ) (R = Me, Et) were prepared by allowing [RuHCl(CO)(PPh3)3] ( 1 ) to react with an excess of phosphites P(OR)3 in refluxing benzene. Treatment of hydrides 2 first with triflic acid and next with an excess of hydrazine afforded hydrazine complexes [RuCl(CO)(κ1‐NH2NHR1)(PPh3)2{P(OR)3}]BPh4 ( 3 , 4 ) (R1 = H, CH3). Diethylcyanamide derivatives [RuCl(CO)(N≡CNEt2)(PPh3)2{P(OR)3}]BPh4 ( 5 ) were also prepared by reacting 2 first with HOTf and then with N≡CNEt2. The complexes were characterized spectroscopically and by X‐ray crystal structure determination of [RuHCl(CO)(PPh3)2{P(OEt)3}] ( 2b ). 相似文献
4.
Eduardo J. Fernández José M. López-de-Luzuriaga Miguel Monge Elena Olmos Antonio Laguna M. Dolores Villacampa Peter G. Jones 《Journal of Cluster Science》2000,11(1):153-167
The compounds [Au3(S2CNMe2)3{
3-(PPh2)3CH]} (1) and [Au3(S2CNMe2)(-S2CNMe2){
3-(PPh2)3CH}]ClO4 (2) are obtained by reaction of [Au3Cl3{
3-(PPh2)3CH}] with three equivalents of sodium dimethyldithiocarbamate or two equivalents of the same reagent in the presence of excess NaClO4. Reaction of 2 with the group 11 metal complexes [AuCl(tht)], CuCl or [Au(C6F5)(tht)] takes place with displacement of [M(S2CNMe2)]n (M=Cu, Au) and formation of the new complexes [Au3X(-S2CNMe2){
3-(PPh2)3CH}]ClO4 (X=Cl (3), X=C6F5 (4)); further reaction of 3 with [Ag(OClO3)(tht)] (tht=tetrahydrothiophene) affords the dicationic species [Au3(-S2CNMe2){
3-(PPh2)3CH}(tht)](ClO4)2 (5). Treatment of [Au3Cl3{
3-(PPh2)3CH}] with one equivalent of NaS2CNMe2 allows the substitution of only one chlorine atom, giving rise to the complex [Au3Cl2(S2CNMe2){
3-(PPh2)3CH}] (6), in which the dithiocarbamate ligand acts as monodentate rather than bidentate bridging as observed in compounds 3–5. The crystal structures of complexes 1 and 2 have been established by X-ray diffraction studies and show close gold–gold contacts. 相似文献
5.
Dr. Sonia Martínez‐Salvador Prof. Dr. Larry R. Falvello Dr. Antonio Martín Dr. Babil Menjón 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(43):14540-14552
Trifluoromethylation of AuCl3 by using the Me3SiCF3/CsF system in THF and in the presence of [PPh4]Br proceeds with partial reduction, yielding a mixture of [PPh4][AuI(CF3)2] ( 1′ ) and [PPh4][AuIII(CF3)4] ( 2′ ) that can be adequately separated. An efficient method for the high‐yield synthesis of 1′ is also described. The molecular geometries of the homoleptic anions [AuI(CF3)2]? and [AuIII(CF3)4]? in their salts 1′ and [NBu4][AuIII(CF3)4] ( 2 ) have been established by X‐ray diffraction methods. Compound 1′ oxidatively adds halogens, X2, furnishing [PPh4][AuIII(CF3)2X2] (X=Cl ( 3 ), Br ( 4 ), I ( 5 )), which are assigned a trans stereochemistry. Attempts to activate C? F bonds in the gold(III) derivative 2′ by reaction with Lewis acids under different conditions either failed or only gave complex mixtures. On the other hand, treatment of the gold(I) derivative 1′ with BF3?OEt2 under mild conditions cleanly afforded the carbonyl derivative [AuI(CF3)(CO)] ( 6 ), which can be isolated as an extremely moisture‐sensitive light yellow crystalline solid. In the solid state, each linear F3C‐Au‐CO molecule weakly interacts with three symmetry‐related neighbors yielding an extended 3D network of aurophilic interactions (Au???Au=345.9(1) pm). The high $\tilde \nu $ CO value (2194 cm?1 in the solid state and 2180 cm?1 in CH2Cl2 solution) denotes that CO is acting as a mainly σ‐donor ligand and confirms the role of the CF3 group as an electron‐withdrawing ligand in organometallic chemistry. Compound 6 can be considered as a convenient synthon of the “AuI(CF3)” fragment, as it reacts with a number of neutral ligands L, giving rise to the corresponding [AuI(CF3)(L)] compounds (L=CNtBu ( 7 ), NCMe ( 8 ), py ( 9 ), tht ( 10 )). 相似文献
6.
Hexanuclear Gold(I) Phosphide Complexes as Platforms for Multiple Redox‐Active Ferrocenyl Units
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Dr. Terence Kwok‐Ming Lee Dr. Eddie Chung‐Chin Cheng Dr. Nianyong Zhu Prof. Dr. Vivian Wing‐Wah Yam 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(1):304-310
The synthesis, X‐ray crystal structures, electrochemical, and spectroscopic studies of a series of hexanuclear gold(I) μ3‐ferrocenylmethylphosphido complexes stabilized by bridging phosphine ligands, [Au6(P?P)n(Fc‐CH2‐P)2][PF6]2 (n=3, P?P=dppm (bis(diphenylphosphino)methane) ( 1 ), dppe (1,2‐bis(diphenylphosphino)ethane) ( 2 ), dppp (1,3‐bis(diphenylphosphino)propane) ( 3 ), Ph2PN(C3H7)‐PPh2 ( 4 ), Ph2PN(Ph‐CH3‐p)PPh2 ( 5 ), dppf (1,1′‐bis(diphenylphosphino)ferrocene) ( 6 ); n=2, P?P=dpepp (bis(2‐diphenylphosphinoethyl)phenylphosphine) ( 7 )), as platforms for multiple redox‐active ferrocenyl units, are reported. The investigation of the structural changes of the clusters has been probed by introducing different bridging phosphine ligands. This class of gold(I) μ3‐ferrocenylmethylphosphido complexes has been found to exhibit one reversible oxidation couple, suggestive of the absence of electronic communication between the ferrocene units through the Au6P2 cluster core, providing an understanding of the electronic properties of the hexanuclear AuI cluster linkage. The present complexes also serve as an ideal system for the design of multi‐electron reservoir and molecular battery systems. 相似文献
7.
Prof. Dr. Michael I. Bruce Alexandre Burgun Guillaume Grelaud Martyn Jevric Brian K. Nicholson Brian W. Skelton Allan H. White Natasha N. Zaitseva 《无机化学与普通化学杂志》2011,637(10):1334-1340
Herein are described some continuing investigations into the reactions of cyano‐alkenes with diynyl‐ruthenium complexes which have resulted in the preparation and characterisation of diynyl‐ruthenium compounds Ru(C≡CC≡CR)(PP)Cp [R = Ph, PP = dppe; R = Fc, PP = dppf; R = CPh=CBr2, PP = (PPh3)2], together with the polycyanobutadienyls Ru{C≡CC[=C(CN)2]CR=CR′(CN)}(PP)Cp′ [R = Fc, (PP)Cp′ = (dppf)Cp; R = H, SiMe3, (PP)Cp′ = (dppe)Cp*] formed by [2 + 2]‐cycloaddition of the cyano‐alkenes to the outer C≡C triple bonds and subsequent ring‐opening reactions. Single‐crystal XRD molecular structure determinations of six complexes are reported. 相似文献
8.
Dr. Thomas J. Feuerstein Dr. Tim P. Seifert André P. Jung Dr. Rouven Müller Dr. Sergei Lebedkin Prof. Dr. Manfred M. Kappes Prof. Dr. Peter W. Roesky 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(70):16676-16682
The synthesis of linear symmetric ethynyl- and acetylide-amidinates of the coinage metals is presented. Starting with the desilylation of the complexes [{Me3SiC≡CC(NDipp)2}2M2] (Dipp=2,6-diisopropylphenyl) (M=Cu, Au) it is demonstrated that this compound class is suitable to serve as a versatile metalloligand. Deprotonation with n-butyllithium and subsequent salt metathesis reactions yield symmetric tetranuclear gold(I) acetylide complexes of the form [{(PPh3)AuC≡CC(NDipp)2}2M2] (M=Cu, Au). The corresponding Ag complex [{(PPh3)AuC≡CC(NDipp)2}2Ag2] was obtained by a different route via metal rearrangement. All compounds show bright blue or blue-green microsecond long phosphorescence in the solid state, hence their photophysical properties were thoroughly investigated in a temperature range of 20–295 K. Emission quantum yields of up to 41 % at room temperature were determined. Furthermore, similar emissions with quantum yields of 15 % were observed for the two most brightly luminescent complexes in thf solution. 相似文献
9.
Michael R. Hall Rachel R. Steen Dr. Marcus Korb Dr. Alexandre N. Sobolev Dr. Stephen A. Moggach Dr. Jason M. Lynam Prof. Paul J. Low 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(32):7226-7234
Reactions of [Ru{C=C(H)-1,4-C6H4C≡CH}(PPh3)2Cp]BF4 ([ 1 a ]BF4) with hydrohalic acids, HX, results in the formation of [Ru{C≡C-1,4-C6H4-C(X)=CH2}(PPh3)2Cp] [X=Cl ( 2 a-Cl ), Br ( 2 a-Br )], arising from facile Markovnikov addition of halide anions to the putative quinoidal cumulene cation [Ru(=C=C=C6H4=C=CH2)(PPh3)2Cp]+. Similarly, [M{C=C(H)-1,4-C6H4-C≡CH}(LL)Cp ]BF4 [M(LL)Cp’=Ru(PPh3)2Cp ([ 1 a ]BF4); Ru(dppe)Cp* ([ 1 b ]BF4); Fe(dppe)Cp ([ 1 c ]BF4); Fe(dppe)Cp* ([ 1 d ]BF4)] react with H+/H2O to give the acyl-functionalised phenylacetylide complexes [M{C≡C-1,4-C6H4-C(=O)CH3}(LL)Cp’] ( 3 a – d ) after workup. The Markovnikov addition of the nucleophile to the remote alkyne in the cations [ 1 a–d ]+ is difficult to rationalise from the vinylidene form of the precursor and is much more satisfactorily explained from initial isomerisation to the quinoidal cumulene complexes [M(=C=C=C6H4=C=CH2)(LL)Cp’]+ prior to attack at the more exposed, remote quaternary carbon. Thus, whilst representative acetylide complexes [Ru(C≡C-1,4-C6H4-C≡CH)(PPh3)2Cp] ( 4 a ) and [Ru(C≡C-1,4-C6H4-C≡CH)(dppe)Cp*] ( 4 b ) reacted with the relatively small electrophiles [CN]+ and [C7H7]+ at the β-carbon to give the expected vinylidene complexes, the bulky trityl ([CPh3]+) electrophile reacted with [M(C≡C-1,4-C6H4-C≡CH)(LL)Cp’] [M(LL)Cp’=Ru(PPh3)2Cp ( 4 a ); Ru(dppe)Cp* ( 4 b ); Fe(dppe)Cp ( 4 c ); Fe(dppe)Cp* ( 4 d )] at the more exposed remote end of the carbon-rich ligand to give the putative quinoidal cumulene complexes [M{C=C=C6H4=C=C(H)CPh3}(LL)Cp’]+, which were isolated as the water adducts [M{C≡C-1,4-C6H4-C(=O)CH2CPh3}(LL)Cp’] ( 6 a–d ). Evincing the scope of the formation of such extended cumulenes from ethynyl-substituted arylvinylene precursors, the rather reactive half-sandwich (5-ethynyl-2-thienyl)vinylidene complexes [M{C=C(H)-2,5-cC4H2S-C≡CH}(LL)Cp’]BF4 ([ 7 a – d ]BF4 add water readily to give [M{C≡C-2,5-cC4H2S-C(=O)CH3}(LL)Cp’] ( 8 a – d )]. 相似文献
10.
Reduction of various pentafluorophenylnickel(II) complexes in the presence of phosphines gives unstable nickel(I) compounds but Ni(C6F5)(CO)2(PPh3)2 is isolated in the presence of CO. Similar NiR(CO)2(PPh3)2 (R = C6F5,C6Cl5, 2,3,5,6-C6Cl4H) are obtained by reaction of the halogenonickel(I) complex with MgRBr or LiR. Reduction of NiX2L2 in the presence of acetylenes gives [NiXL2]2(μ-PhCCR) (R = H, X = Cl and R = Ph, X = Cl, Br) when L = P-n-Bu3 but only NiX(PPh3)3 are recovered when L = PPh3. No reaction with the alkyne is observed for [NiX(PPh3)2]n but [NiCl(PPh3)]n reacts with RCCR′ to give paramagnetic NiCl(PPh3)(CRCR′) (R = Ph, R′= H, COOEt), diamagnetic [NiCl(PPh3)]2(μ-PhCCPh) and cyclotrimerization when R = R′ = COOMe. Chemical and structural behaviour of the new nickel(I) complexes is described. 相似文献
11.
Neutral polyfluorophenyl complexes of the type RAuL and RAuL-LAuR and anionic complexes of the type [AuR2]? (R = 2,3,5,6-C6F4H, 2,4,6-C,F3H2, 3,6-C6F2H3, 4-C6 FH4 or 3-CF3C,H4) are obtained by the reaction of ClAuL (L = PPh3, P(cyclohexyl)3, AsPh3 or tetrahydrothiophen; L-L = Ph2PCH2PPh2 or Ph2PCH2CH2PPPh2) with an organolithium derivative and/or the replacement of the initial ligands L by other mono- or bi-dentate ligands.The outcome of the reaction of [AuR2]? with [Au(PCy3)2]+ (Cy = cyclohexyl), depends on the nature of the ligand R; thus with R = 3,6-C6,F2H3 the product is [Au(PCy3)2][AuR2], while with R = 2,4,6-C6F3H2, the product is [Au(PCy3)(2,4,6-C6F3H2)]. 相似文献
12.
Elke Schwed Hans-Ulrich Hund H. William Bosch Heinz Berke 《Helvetica chimica acta》1991,74(1):189-196
Carbonyl(cycloheptatrienyl)iodo(phosphorus donor)tungstens ([WI(C7H7)(CO)L]; L = P(OMe)3, 1a ; L = P[O(i-Pr)]3, 1b ; L = PPh3, 1c ) were prepared from dicarbonyl(cycloheptatrienyl)iodotungsten ([WI(C7H7)(CO)2)] via a carbonyl-substitution process. Similarly, bromocarbonyl(phosphorus donor)(1,2,4,6-tetramethylcycloheptatrienyl)tungstens ([WBr(Me4C7H3)(CO)L]; L = P(OMe)3, 6a ; L = P[O(i-Pr)]3, 6b ; L = PPh3, 6c ) were obtained from the reaction of bromodicarbonyl(1,2,4,6)-tetramethylcycloheptatrienyl)tungsten ([WBr(Me4C7H3)(CO)2]; 4 ) with L. The reduction of 1a - c , 4 , and 6a , b with sodiumdihydridobis(2-methoxyethoxy)aluminium in toluene led to stable hydrido complexes [WH(R4C7H3)(CO)L] (R = H, L = P(OMe)3, 2a ; R = H, L = P[O(i-Pr)]3, 2b ; R = H, L = PPh3, 2c ; R = Me, L = P(OMe)3, 7a ; R = Me, L = P[O(i-Pr)]3, 7b ; R = Me, L = CO, 7d ). Complexes 2a and 7b were characterized by X-ray structure analyses. 相似文献
13.
Triple Helicates with Golden Strands: Self‐Assembly of M2Au6 Complexes from Gold(I) Metallaligands and Iron(II), Cobalt(II) or Zinc(II) Cations
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Verónica Cámara Prof. Dr. Norberto Masciocchi Dr. Juan Gil‐Rubio Prof. Dr. José Vicente 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(5):1389-1402
Alkynyl gold(I) metallaligands [(AuC≡Cbpyl)2(μ‐diphosphine)] (bpyl=2,2′‐bipyridin‐5‐yl; diphosphine=Ph2P(CH2)nPPh2, [n=3 (LPr), 4 (LBu), 5 (LPent), 6 (LHex)], dppf (LFc), Binap (LBinap) and Diop (LDiop)) react with MX2 (M=Fe, Zn, X=ClO4; M=Co, X=BF4) to give triple helicates [M2(LR)3]X4. These complexes, except those containing the semirigid LBinap metallaligand, present similar hydrodynamic radii (determined by diffusion NMR spectroscopy measurements) and a similar pattern in the aromatic region of their 1H NMR spectra, which suggests that in solution they adopt a compact structure where the long and flexible organometallic strands are folded. The diastereoselectivity of the self‐assembly process was studied by using chiral metallaligands, and the absolute configuration of the iron(II) complexes with LBinap and LDiop was determined by circular dichroism spectroscopy (CD). Thus, (R)‐LBinap or (S)‐LBinap specifically induce the formation of (Δ,Δ)‐[Fe2((R)‐LBinap)3](ClO4)4 or (Λ,Λ)‐[Fe2((S)‐LBinap)3](ClO4)4, respectively, whereas (R,R)‐ or (S,S)‐LDiop give mixtures of the ΔΔ‐ and ΛΛ‐diastereomers. The ΔΔ helicate diastereomer is dominant in the reaction of FeII with (R,R)‐LDiop, whereas the ΛΛ isomer predominates in the analogous reaction with (S,S)‐LDiop. The photophysical properties of the new dinuclear alkynyl complexes and the helicates have been studied. The new metallaligands and the [Zn2(LR)3]4+ helicates present luminescence from [π→π*] excited states mainly located in the C≡Cbpyl units. 相似文献
14.
Sebastian Planer Dr. Jenni Frosch Marvin Koneczny Dr. Damian Trzybiński Prof. Dr. Krzysztof Woźniak Prof. Dr. Karol Grela Prof. Dr. Matthias Tamm 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(61):15218-15226
The lithium complexes [(WCA-NHC)Li(toluene)] of anionic N-heterocyclic carbenes with a weakly coordinating borate moiety (WCA-NHC, WCA=B(C6F5)3, NHC=IDipp=1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) were used for the preparation of silver(I) or copper(I) WCA-NHC complexes. While the reactions in THF with AgCl or CuCl afforded anionic mono- and dicarbene complexes with solvated lithium counterions [Li(THF)n]+ (n=3, 4), the reactions in toluene proceeded with elimination of LiCl and formation of the neutral phosphine and arene complexes [(WCA-NHC)M(PPh3)] and [(WCA-NHC)M(η2-toluene)] (M=Ag, Cu). The latter were used for the preparation of chlorido- and iodido-bridged heterobimetallic Ag/Ru and Cu/Ru complexes [(WCA-NHC)M(μ-X)2Ru(PPh3)(η6-p-cymene)] (M=Ag, Cu, X=Cl; M=Ag, X=I). Surprisingly, these complexes resisted the elimination of CuCl, AgCl, or AgI, precluding WCA-NHC transmetalation. 相似文献
15.
Prithwiraj Byabartta 《Transition Metal Chemistry》2007,32(3):314-324
Silver assisted de-bromination gives [Au2(dppm/dppe/dppa) (OTf)2], which on reaction with 4,4′-bpy and gold(I) phosphines in CH2Cl2 medium, by the self assembly technique, leads to [(PPh3)Au(4,4′-bpy)Au(PPh3)], (1a–1d,2), [{Au2(dppm/dppe/dppa)}{(4,4-bpy)Au(PPh3)}2](NO3)4, (3), [{Au4(dppm/dppe/dppa)2(4,4-bpy)2}](OTf)4,
(4), [{(PPh3)AuI(4,4′-bpy)}2AuIII(C6F5/Mes)](NO3)3, (5) [dppm/dppe/dppa =diphenyl phosphino-methane(a), –ethane(b), ammine(c), C6F5/Mes pentafluorophenyl/mesitylene]. The maximum molecular peak of the corresponding molecule is observed in the ESI mass spectrum.
Ir spectra of the complexes show –C=C–, –C=N–, as well as phosphine, mesitylene and pentafluorophenyl stretching. The 1H-NMR spectra as well as 31P(1H)-NMR suggest solution stereochemistry, proton movement and phosphorus proton interaction. Considering all the moities there
are a lot of carbon atoms in the molecule reflected by the 13C(H)-NMR spectrum. In the 1H–1H COSY spectrum of the present complexes and contour peaks in the 1H–13C-HMQC spectrum, assign the solution structure and stereoretentive transformation in each step. 相似文献
16.
Kwok W. Chiu Henry S. Rzepa Richard N. Sheppard Geoffrey Wilkinson Wai-Kwok Wong 《Polyhedron》1982,1(11-12)
Neutral mononuclear tertiary phosphine rhodium(I) complexes of the formula RhX(PMe3)(dppm), X = Cl, CH2SiMe3, CH2CMe3, CH2CMe2Ph, η5-C5H5, DPPM = bis(diphenylphosphino)methane, RhCl(PPh3)(dppm), RhX(dppm)2, X = Cl, Me and Rh(η5-C5H5(dppm) have been synthesised. In Rh(η5-C5H5)(PMe3)(dppm), the dppm ligand is unidentate according to 31P{1H} NMR and X-ray data.The 31P{1H} NMR spectral parameters of RhX(PR3)(dppm) have been determined by a combination of two dimensional δ/J resolved spectroscopy and heteronuclear nuclear Overhauser effect difference spectroscopy (NOEDS) in conjunction with iterative analysis of the one dimensional spectra. 相似文献
17.
Calculations have been performed at the MP2 and DFT levels for investigating the reasons for the difficulties in synthesizing bis(isocyanide)gold(I) halide complexes. Three‐coordinated gold(I) complexes of the type (R3P)2AuIX ( 1 ) can be synthesized, whereas the analogous isocyanide complexes (RNC)2AuIX ( 2 ) are not experimentally known. The molecular structures of (R3P)2AuIX (X = Cl, Br, and I) and (RNC)2AuIX with X = halide, cyanide, nitrite, methylthiolate, and thiocyanate are compared and structural differences are discussed. Calculations of molecular properties elucidate which factors determine the strength of the gold‐ligand interactions in (RNC)2AuIX. The linear bonding mode of RNC favors a T‐shaped geometry instead of the planar Y‐shaped trigonal structure of (R3P)2AuIX complexes that have been synthesized. An increased polarity of the Au–X bond in 2 leads to destabilization of the Y‐shaped structure. Chalcogen‐containing ligands or cyanide appear to be good X‐ligand candidates for synthesis of (RNC)2AuIX complexes. 相似文献
18.
Synthesis and Catalytic Use of Gold(I) Complexes Containing a Hemilabile Phosphanylferrocene Nitrile Donor
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Karel Škoch Dr. Ivana Císařová Prof. Dr. Petr Štěpnička 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(45):15998-16004
Removal of the chloride ligand from [AuCl( 1 ‐κP)] ( 2 ) containing a P‐monodentate 1′‐(diphenylphosphanyl)‐1‐cyanoferrocene ligand ( 1 ), by using silver(I) salts affords cationic complexes of the type [Au( 1 )]X, which exist either as cyclic dimers [Au( 1 )]2X2 ( 3 a , X=SbF6; 3 c , X=NTf2) or linear coordination polymers [Au( 1 )]nXn ( 3 a′ , X=SbF6; 3 b′ , X=ClO4), depending on anion X and the isolation procedure. As demonstrated for 3 a′ , the polymers can be readily cleaved by the addition of donors, such as Cl?, tetrahydrothiophene (tht) or 1 , giving rise to the parent compound 2 , [Au(tht)( 1 ‐κP)][SbF6] ( 5 a ) or [Au( 1 ‐κP)2][SbF6] ( 4 a ), respectively, of which the last two compounds can also be prepared by stepwise replacement of tht in [Au( 1 ‐κP)2][SbF6]. The particular combination of a firmly coordinated (phosphane) and a dissociable (nitrile) donor moieties renders complexes 3/3′ attractive for catalysis because they can serve as shelf‐stable precursors of coordinatively unsaturated AuI fragments, analogous to those that result from the widely used [Au(PR3)(RCN)]X catalysts. The catalytic properties of the Au‐ 1 complexes were evaluated in model annulation reactions, such as the synthesis of 2,3‐dimethylfuran from (Z)‐3‐methylpent‐2‐en‐4‐yn‐1‐ol and oxidative cyclisation of alkynes with nitriles to produce 2,5‐disubstituted 1,3‐oxazoles. Of the compounds tested ( 2 , 3 a′ , 3 b′ , 3 a , 4 a and 5 a ), the best results were consistently achieved with dimer 3 c , which has good solubility in organic solvents and only one firmly bound donor at the gold atom. This compound was advantageously used in the key steps of annuloline and rosefuran syntheses. 相似文献
19.
Ershov A. Yu. Shashko A. D. Sizova O. V. Ivanova N. V. 《Russian Journal of General Chemistry》2002,72(9):1327-1338
Complexes cis-[Ru(bpy)2(bipy)(X)]
n
+ [bpy = 2,2'-bipyridyl, bipy = 4,4'-bipyridyl, X = Br-, ONO-, CN- (n = 1); MeCN, PPh3 (n = 2), and NO+ (n = 3)] were synthesized. Irradiation of acetonitrile solutions of the complexes with X = Cl-, Br-, ONO-, NO2-, CN-, NH3, MeCN, and PPh3 by visible light results in photosubstitution of 4,4'-bipyridyl by a solvent molecule. The electronic absorption spectra of the complexes were assigned on the basis of quantum-chemical calculations. A correlation was revealed between photolysis quantum yields and charges transferred from ligands X upon their coordination. 相似文献
20.
Reactions of the oxorhenium(V) complexes [ReOX3(PPh3)2] (X = Cl, Br) with the N‐heterocyclic carbene (NHC) 1,3,4‐triphenyl‐1,2,4‐triazol‐5‐ylidene (LPh) under mild conditions and in the presence of MeOH or water give [ReOX2(Y)(PPh3)(LPh)] complexes (X = Cl, Br; Y = OMe, OH). Attempted reactions of the carbene precursor 5‐methoxy‐1,3,4‐triphenyl‐4,5‐dihydro‐1H‐1,2,4‐triazole ( 1 ) with [ReOCl3(PPh3)2] or [NBu4][ReOCl4] in boiling xylene resulted in protonation of the intermediately formed carbene and decomposition products such as [HLPh][ReOCl4(OPPh3)], [HLPh][ReOCl4(OH2)] or [HLPh][ReO4] were isolated. The neutral [ReOX2(Y)(PPh3)(HLPh)] complexes are purple, airstable solids. The bulky NHC ligands coordinate monodentate and in cis‐position to PPh3. The relatively long Re–C bond lengths of approximate 2.1Å indicate metal‐carbon single bonds. 相似文献