Synthesis, X-ray structure and spin crossover in the triple-decker complex [(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)Cr(µ<sup>2</sup>:η<sup>5</sup>-P<sub>5</sub>)Cr(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)]<sup>+</sup>[A]<sup>–</sup>(A = PF<sub>6</sub>, SbF<sub>6</sub>)
作者:Andrew K. Hughes、Vincent J. Murphy、Dermot O'Hare
DOI:10.1039/c39940000163
日期:——
The triple-decker chromium complexes [(η5-C5Me5)Cr(µ2:η5-P5)Cr(η5-C5Me5)]+[A]â(A = PF6, SbF6) can be prepared in high yield by oxidation of [(η5-C5Me5)Cr(µ2:η5-P5)Cr(η5-C5Me5)] with either [Fe(η5-C5H5)2]+[A]â(A = PF6, SbF6); the single crystal X-ray structure determination for [(η5-C5Me5)Cr(µ2:η5-P5)Cr(η5-C5Me5)]+[SbF6]â reveals that the CrâCr separation is 3.185(8)à which is 0.456 à longer than in the neutral complex; magnetic susceptibility studies show that these 26-electron multidecker cations in these salts undergo spin crossover at 33 and 23 K respectively.
Complexes from Ring Opening of Lawesson's Reagent and Phosphorus−Phosphorus Coupling
作者:Zhiqiang Weng、Weng Kee Leong、Jagadese J. Vittal、Lai Yoong Goh
DOI:10.1021/om020933z
日期:2003.4.1
At ambient temperature the reaction of [CpCr(CO)3]2 (1; Cp = η5-C5H5) with 1 mol equiv of Lawesson's reagent, Ar2P2S4 (2; Ar = C6H4OCH3), for 3 h led to the isolation of brown crystals of Cp2Cr2(CO)5(SPAr) (3), dark red solids of Cp2Cr2(CO)5(S2PAr) (4), deep blue solids of Cp2Cr2(S2P(O)Ar)2 (5), greenish yellow solids of CpCr(CO)3H (9), and deep green crystals of Cp2Cr2(CO)4S (10) with yields of 5
在环境温度[CPCR(CO)的反应3 ] 2(1 ; CP =η 5 -C 5 H ^ 5)与1摩尔当量Lawesson试剂中,Ar的2 P 2小号4(2 ;氩= C 6 H ^ 4 OCH 3),持续3 h导致分离出Cp 2 Cr 2(CO)5(SPAr)(3)的棕色晶体,Cp 2 Cr 2(CO)5(S 2 PAr)的深红色固体(4),Cp 2 Cr 2(S 2 P(O)Ar)2(5)的深蓝色固体,CpCr(CO)3 H(9)的浅黄色固体和Cp 2 Cr 2(CO)的深绿色晶体4 S(10)的产率分别为5、11、20、7和8%;在90 ° C下进行类似的反应2小时,得到5(36%),CpCr(CO)2(SP(H)Ar)(6)为红色晶体(9%),[CpCr(CO)2(SPAr)] 2(顺式- 7)为暗褐色结晶固体(14%),其异构体trans - 7为暗红色结晶(5%),以及9(4%)和10(11%)。的环境温度的[Cp
Spectroscopic Detection and Theoretical Confirmation of the Role of Cr<sub>2</sub>(CO)<sub>5</sub>(C<sub>5</sub>R<sub>5</sub>)<sub>2</sub> and ·Cr(CO)<sub>2</sub>(ketene)(C<sub>5</sub>R<sub>5</sub>) as Intermediates in Carbonylation of NNCHSiMe<sub>3</sub> to OCCHSiMe<sub>3</sub> by ·Cr(CO)<sub>3</sub>(C<sub>5</sub>R<sub>5</sub>) (R = H, CH<sub>3</sub>)
作者:George C. Fortman、Tamás Kégl、Qian-Shu Li、Xiuhui Zhang、Henry F. Schaefer、Yaoming Xie、R. Bruce King、Joshua Telser、Carl D. Hoff
DOI:10.1021/ja075008o
日期:2007.11.1
N=N=CHSiMe3 to O=C=CHSiMe3 by the radicalcomplexes .Cr(CO)3C5R5 (R = H, CH3) derived from dissociation of [Cr(CO)3(C5R5)]2 have been investigated under CO, Ar, and N2 atmospheres. Under an Ar or N2 atmosphere the reaction is stoichiometric and produces the Cr[triple bond]Cr triply bonded complex [Cr(CO)2(C5R5)]2. Under a CO atmosphere regeneration of [Cr(CO)3(C5R5)]2 (R = H, CH3) occurs competitively
Photogeneration of dinuclear metal carbonyls containing a metal-metal triple bond
作者:D.S. Ginley、C.R. Bock、M.S. Wrighton
DOI:10.1016/s0020-1693(00)94746-7
日期:1977.1
complexes [(η5C5H5)M(CO)2]2 (M = Cr, Mo, W) and [(η5-C(in5)(CH3)5)M(CO)2]2 (M = Cr, Mo) is reported. These species are formulated as metal-metal triple bonded complexes which can be generated from the corresponding [(η5-C5H5)M(CO)3]2 and [(η5-C5(CH3)5M(CO)3]2 metal-metal single bonded complexes by either irradiation at 25° or by heating. All of the triple bonded complexes take up CO at 25° to generate
Solution Calorimetric and Stopped-Flow Kinetic Studies of the Reaction of •Cr(CO)<sub>3</sub>C<sub>5</sub>Me<sub>5</sub> with PhSe−SePh and PhTe−TePh. Experimental and Theoretical Estimates of the Se−Se, Te−Te, H−Se, and H−Te Bond Strengths
作者:James E. McDonough、John J. Weir、Matthew J. Carlson、Carl D. Hoff、Olga P. Kryatova、Elena V. Rybak-Akimova、Christopher R. Clough、Christopher C. Cummins
DOI:10.1021/ic048321p
日期:2005.5.1
agreement with kineticstudies of H atom transfer from HSePh at higher temperatures. The reaction of H-Cr(CO)3C5Me5 with PhSe-SePh is accelerated by the addition of a Crradical and occurs via a rapid radical chain reaction. In contrast, the reaction of PhTe-TePh and H-Cr(CO)3C5Me5 does not occur at any appreciable rate at room temperature, even in the presence of added Crradicals. This is in keeping