Thorocene adducts of the neutral 2,2′-bipyridine and its radical anion. Synthesis and crystal structures of [Th(η8-C8H8)2(κ2-bipy)] and [Th(μ-η8:η5-C8H8)2(κ2-bipy)K(py)2]∞
species Cp*2UCl2Na(thf)2 did not afford the trivalent complex Cp*2U(OTf) (9) but gave crystals of the dimeric uranium(IV) “ate” compound [Cp*2U(OTf)3Na(thf)2]2·2(CH2)4O (10·2(CH2)4O). The first organouranium(III) triflate, 9, was isolated in 90% yield from the reaction of U(OTf)3 with 2 equiv of KCp* in thf. Dissolution of Cp*2UI(py) in acetonitrile gave the adduct Cp*2UI(NCMe)2 (11), which, like its
Bis(formylpyrrolyl) cobalt complexes as mediators in the reversible-deactivation radical polymerization of styrene and methyl methacrylate
作者:Tiago F. C. Cruz、Pedro M. M. Machado、Clara S. B. Gomes、José R. Ascenso、M. Amélia N. D. A. Lemos、João C. Bordado、Pedro T. Gomes
DOI:10.1039/c8nj00350e
日期:——
polymerization (ATRP) mechanism, below 70 °C and of methyl methacrylate, by an organometallic mediated radical polymerization (OMRP)/catalytic chain transfer (CCT) interplay mechanism, below 50 °C. The pure ATRP nature of styrene polymerization allowed the synthesis of the polystyrene-b-poly(methyl methacrylate) block copolymer, as confirmed by GPC/SEC and DOSY NMRstudies. Attempts to isolate a Co(III) species
Cationic Nickel(II) Complexes of Chelating N-Heterocyclic Carbenes
作者:Richard E. Douthwaite、Daniel Haüssinger、Malcolm L. H. Green、Peter J. Silcock、Pedro T. Gomes、Ana M. Martins、Andreas A. Danopoulos
DOI:10.1021/om990398b
日期:1999.10.1
the bite angles at the nickel atoms, 84.92(18) and 88.4(4)°, respectively, are comparable to Ni(II) complexes of two-carbon-atom bridging chelating bis-phosphines. Reaction between NiCl2(PMe3)2 or NiBr2(DME) and 2 equiv of 1 gives the Ni(II) dicationic salts [Ni(tBuCCmeth)2][X]2 (X = Cl- (5a), X = Br- (5b)). The X-ray structure of 5b reveals a square-planar geometry at the nickel atom, and the dication
螯合的N-杂环卡宾的阳离子单核Ni(II)配合物tBu CC meth和tBu CC eth(其中tBu CC meth = 1,1'-亚甲基-3,3'-二叔丁基-丁基二咪唑-2,2'-已经制备了二亚烷基(1)和tBu CC eth = 1,2-乙烯-3,3'-二叔丁基二咪唑-2,2'-二亚烷基(2))并对其结构进行了表征。NiCl 2(PMe 3)2与1当量的1或2之间的反应生成单阳离子盐[(tBu CC甲基)NiCl(PMe 3)] Cl(3a)和[(tBu CC eth)NiCl(PMe 3)] Cl(4a),它们与TlBPh 4进行盐复分解,得到[(tBu CC meth)NiCl(PMe)3)] [BPh 4 ](3b)和[(tBu CC eth)NiCl(PMe 3)] [BPh 4 ](4b)。3a和4b的X射线结构比较示出了咬角在镍原子,84.92(18)和88.4(4)°
Uranium(III) Redox Chemistry Assisted by a Hemilabile Bis(phenolate) Cyclam Ligand: Uranium–Nitrogen Multiple Bond Formation Comprising a <i>trans</i>-{RN═U(VI)═NR}<sup>2+</sup> Complex
作者:Leonor Maria、Isabel C. Santos、Vânia R. Sousa、Joaquim Marçalo
DOI:10.1021/acs.inorgchem.5b01547
日期:2015.9.21
diuranium(IV/IV) complex [(κ4-(tBu2ArO)2Me2-cyclam})(N3)U(μ-N)U(κ5-(tBu2ArO)2Me2-cyclam})] (5). Two equivalents of [U(κ6-(tBu2ArO)2Me2-cyclam})I] (1) effect the four-electron reduction of 1 equiv of PhN═NPh to form the bis(imido) complex [U(κ4-(tBu2ArO)2Me2-cyclam})(NPh)2] (6) and the U(IV) species 2-I. Moreover, the hemilability of the hexadentate ancillary ligand (tBu2ArO)2Me2-cyclam2– allows to perform the
New reactions of uranium amide complexes leading to pentavalent and cationic derivatives
作者:Jean-Claude Berthet、Michel Ephritikhine
DOI:10.1039/c39930001566
日期:——
Protonolysis of U–N bonds in a series of uranium amide complexes by means of NEt3HBPh4 gives the corresponding cationic compounds, whereas oxidation of anionic UIV amide complexes by TlBPh4 affords the related pentavalent derivatives; thus the UV compounds [U(NEt2)5], [U(cot)(NEt2)3] and [U(cot)(NEt2)2(thf)][BPh4] have been prepared (cot =η-C8H8, thf = tetrahydrofuran).