- A convenient synthesis of C5(CD3)5H. Synthesis and characterisation of Fe{η5-C5(CD 3)5}2
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The large scale synthesis of deuterio(pentamethylcyclopentadiene), C 5(CD3)5H ([2H30] Cp*H), and subsequent synthesis of [2H30][Fe(η- Cp*)2] is described, together with i.r., Ramah, and solid state 2H n.m.r. spectroscopic characterisation.
- O'Hare, Dermot,Manriquez, Juan,Miller, Joel S.
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- Synthesis and characterization of mono-(pentamethylcyclopentadienyl)alkoxyscandium alkyl derivatives, (η5-C5Me5)(OR)ScR'
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Strategies for the syntheses of the title compounds are described.Cp*Sc(acac)2 (Cp* = (η5-C5Me5); acac = acetylacetonate) is prepared by treatment of Sc(acac)3 with Cp*MgClTHF.Oligomeric *ScCl2>
- Piers, Warren E.,Bunel, Emilio E.,Bercaw, John E.
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- Sublimation kinetics of scandium β-diketonates
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The volatile scandium-β-diketonates are synthesised using acetylacetone (acac) and tetramethylheptanedione (tmhd) as coordinative ligands for CVD application. The X-ray powder patterns are indexed and analysed and found to be orthorhombic and monoclinic p
- Selvakumar,Raghunathan,Nagaraja
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- Photoinduced energy- and electron-transfer processes within dynamic self-assembled donor-acceptor arrays
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The synthesis and the photophysical properties of a series of noncovalently assembled donor-acceptor systems, dyads, is reported. The presented approach uses an "innocent" coordination compound, a scandium(III) acetyl acetonate derivative, as core and promotor of the dyad formation. Intercomponent photoinduced energy transfer or electron transfer within the dynamic assembly, which yields to a statistical library of donor-acceptor systems, is reported. The assemblies for energy-transfer processes are constituted by an energy donor, Ru(bpy)32+-based component (bpy = 2,2′-bipyridine), and by an energy-acceptor moiety, anthracene-based unit, both substituted with a chelating ligand, acetyl acetone, that via coordination with a scandium ion will ensure the formation of the dyad. If N,N,N′N′-tetramethyl-2,5-diaminobenzyl-substituted acetyl acetonate ligands are used in the place of 9-acyl-anthracene, intramolecular photoinduced electron transfer from the amino derivative (electron donor) to the Ru(bpy)32+-unit was detected upon self-assembly, mediated by the scandium complex. The photophysical processes can be studied on the lifetime of the kinetically labile complexes.
- Kercher, Michael,Koenig, Burkhard,Zieg, Harald,De Cola, Luisa
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p. 11541 - 11551
(2007/10/03)
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- Rate and mechanism of ligand exchange of tris(acetylacetonato)scandium(III) in acetonitrile
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Tris(acetylaceotnato)scandium(III) undergoes ligand exchange with the enolate form of acetylacetone in CD3CN at 30-74°C. The observed first-order rate constant, obtained by the 1H NMR method, is expressed by k0 = k1′[enol] + k2′ at [complex] ? 0.05 M, [Hacac] = 0.19 - 0.58 M, and [H2O] = 0.026-0.26 M; k1′ = 52 ± 3 M-1' s-1 and k2′ = 1.5 ± 0.9 s-1 at 56°C. No water catalysis was observed. The k2′ term is minor in the concentration region. The ΔH? and ΔS? values for k1′ are 36 ± 5 kJ mol-1 and -105 ± 16 J K-1 mol-1, respectively. The deuterium isotope effect k1′(H)/k1′(D) was significant (ca. 5). The Ia mechanism is assigned to the rate-determining formation of an intermediate containing a one-ended acac- and a unidentate Hacac in the enol form.
- Hatakeyama, Yoshihiro,Kido, Hiroaki,Harada, Masayuki,Tomiyasu, Hiroshi,Fukutomi, Hiroshi
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p. 992 - 996
(2008/10/08)
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