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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Double addition of phenylacetylene onto the mixed bridge phosphinito-phosphanido Pt(I) complex [(PHCy2)Pt(mu-PCy2){kappa P-2,O-mu-P(O)Cy-2}Pt(PHCy2)](Pt-Pt)
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Double addition of phenylacetylene onto the mixed bridge phosphinito-phosphanido Pt(I) complex [(PHCy2)Pt(mu-PCy2){kappa P-2,O-mu-P(O)Cy-2}Pt(PHCy2)](Pt-Pt)

机译:将苯乙烯加入到混合桥磷酸磷脂Pt(i)复合物[(phcy2)pt(mu-pcy2){kappa p-2,o-mu-p(o)cy-2} pt(phcy2)]( PT-PT)

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摘要

The reaction of the dinuclear phosphinito bridged complex [(PHCy2)Pt(mu-PCy2){kappa P-2,O-mu-P(O)Cy-2}Pt(PHCy2)](Pt-Pt) (1) with phenylacetylene affords the eta(1)-alkenyl-mu,eta(1):eta(2)-alkynyl complex [(eta(1)-trans-(Ph)HC=CH)(PHCy2)Pt(mu-PCy2)(mu,eta(1):eta(2)-PhC?C)Pt{kappa P-P(O)Cy-2}(PHCy2)] (4) displaying a sigma-bonded 2-phenylethenyl ligand and an alkynyl (mu-kappa C-alpha:eta(2)) bridge between the platinum atoms. Complex 4 was shown to form in two steps: initially, the attack of the first molecule of phenylacetylene gives the sigma-acetylide complex [(PHCy2)(eta(1)-PhC=C)Pt-1(mu-PCy2)Pt-2(PHCy2){kappa P-P(OH)Cy-2}](Pt-Pt) (5) featuring an intramolecular pi-type hydrogen bond between the POH and the C?C triple bond; fast reaction of 5 with a second molecule of phenylacetylene results in the oxidative addition of the terminal C-H bond of the second alkyne to Pt-1 that, after rearrangements, leads to 4. When left in solution for two weeks, complex 4 spontaneously isomerizes completely to [(PHCy2)(eta(1)-trans-(Ph)HC=CH)Pt(mu-PCy2){kappa P-2,O-mu-P(O)Cy-2}Pt(eta(1)-PhC=C)(PHCy2)] (7) displaying a 2-phenylethenyl ligand and a phenylethynyl group both sigma-bonded to the metal. Density functional calculations at the B3LYP/LACV3P++**//DFT/LACVP* level were carried out to study the thermodynamics of the formation of all considered complexes and to trace the mechanism of formation of the observed products.
机译:二核磷酸盐桥桥复合物[(phcy2)Pt(mu-pcy2){kappa p-2,O-mu-p(O)cy-2} pt(phcy2)](pt-pt)(1)苯基乙炔提供ETA(1) - 链烯基-MU,ETA(1):ETA(2) - 炔基复合物[(ETA(1) - (pH) - (pH)HC = CH)(PHCY2)Pt(MU-PCY2)( Mu,Eta(1):Eta(2)-phc?c)pt {kappa pp(o)cy-2}(phcy2)](4)显示Sigma键合的2-苯基乙烯 - 配体和炔基(mu-kappa C-alpha:铂原子之间的ETA(2))桥。显示复合物4以两步形成:最初,第一分子的苯乙烯的攻击给予σ-乙酰化络合物[(phcy2)(Eta(1)-phc = c)pt-1(mu-pcy2)pt- 2(phcy2){kappa pp(OH)cy-2}](pt-pt)(5)在POH和C 2之间的分子内Pi型氢键具有三键之间;用第二分子的苯基乙炔5的快速反应导致第二烷烃的末端CH键的氧化剂添加到Pt-1中,除了重排后,导致4.当溶液中留下两周后,复合物4完全自发地异构化对于[(phcy2)(Eta(1) - (pH) - hc = ch)pt(mu-pcy2){kappa p-2,o-mu-p(o)cy-2} pt(eta(1) -phc = c)(phcy2)](7)显示2-苯基乙烯基配体和苯基乙炔基与金属粘合。 B3LYP / LACV3P ++ ** // DFT / LACVP *级别的密度官能计算是为了研究所有考虑的复合物的形成和追踪观察到的产品的形成机制。

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