Preparation and Properties of Cp2Zr(μ-NCAr2)2PdCl(Me), New Zr/Pd Heterobimetallic Complexes with Bridging Alkylideneamido Ligands
摘要:
Zr/Pd heterobimetallic complexes with bridging alkylideneamido ligands, Cp2Zr(mu-N=CAr2)(2)PdCl(Me) (Ar = Ph, C6H4Me-4), were prepared from the reaction of Cp2Zr(N=CAr2)(2) with PdCl(Me)(cod) (cod = 1,5-cyclooctadiene). Cp2Zr(mu-N=CAr2)(2)PdCl(Me) complexes have puckered ZrN2Pd rings with Zr-Pd distances of 2.8135(5) Angstrom (Ar = Ph) and 2.8416(4) Angstrom (Ar = C6H4Me-4), respectively. The complexes reacted with HCl to afford trans-PdCl(Me)(NH=CAr2)(2) and Cp2ZrCl2. Exposure of a CH2Cl2 solution of trans-PdCl(Me){NH=C(C6H4Me-4)(2)}(2) to light results in the formation of a mixture of cis- and trans-PdCl(CHCl2){NH=C(C6H4Me-4)(2)}(2).
Reactions of 1,4- and 2,3-Diazadienes with Titanocene and Zirconocene Complexes of Bis(trimethylsilyl)acetylene: Acetylene Coupling or Substitution Including Subsequent C−H Activation, C−C Coupling, and N−N Cleavage to Heterobimetallic Complexes
the metals and the bis(imido) complexes Cp2M(−NCPh2)2 (M = Zr (9), Ti (10)) were isolated. The central C−C bond of 7 is cleaved in a subsequent reaction with CpCo(C2H4)2 and, after an activation of the N−N bond of the azine, the heterobimetallic complex (Cp2Ti)(μ-NCHPh)2(CpCo) (11) was formed. In the reaction of benzaldehyde azine with CpCo(C2H4)2 the isoelectronic homobimetallic bis(alkylideneamido)
的1,4- diazadienes RN反应CHCH NR与双的二茂钛和茂锆复合物(三甲基甲硅烷基)乙炔的Cp 2 M(L)(η 2 -Me 3的SiC 2森达3)(M =钛,没有L(1) ; M =锆,L = THF(2),吡啶(3))是获得1-metalla -2,5- diazacyclopent -3-烯络合物的Cp的一般和新方法2 M(η 2 -1:4- RNCH CHNR)(M = Zr,R = 2,6- iPr 2 C 6 H 3(4a),4-Me-C 6 H 4 (4b),Cy(4c);M = Ti,R = 2,6- iPr 2 C 6 H 3(5a),4-Me-C 6 H 4(5b),Cy(5c))。在与不同取代的嗪类RR'C NN CRR'的类似反应中,产物很大程度上取决于所用金属Zr和Ti,以及取代基R和R'。在R = R′= Me且M = Ti的情况下,观察到炔被炔取代并且随后的CH被活化为1-钛-2
Molecular Spectroscopy of Uranium(IV) Bis(ketimido) Complexes. Rare Observation of Resonance-Enhanced Raman Scattering from Organoactinide Complexes and Evidence for Broken-Symmetry Excited States
作者:Ryan E. Da Re、Kimberly C. Jantunen、Jeffrey T. Golden、Jaqueline L. Kiplinger、David E. Morris
DOI:10.1021/ja044315g
日期:2005.1.1
lower-energy electronic absorption bands (E(max) approximately 16300 cm(-1)) is a charge-transfertransition between the U(IV) center and the ketimido ligand(s). The observations of both charge-transfertransitions and resonanceenhancement of Ramanvibrational bands are exceedingly rare for tetravalent actinide complexes and reflect the strong bonding interactions between the uranium 5f/6d orbitals and