141-52-6Relevant articles and documents
Enhanced vapor-phase processing in fluorinated Fe4 single-molecule magnets
Rigamonti, Luca,Piccioli, Marco,Malavolti, Luigi,Poggini, Lorenzo,Mannini, Matteo,Totti, Federico,Cortigiani, Brunetto,Magnani, Agnese,Sessoli, Roberta,Cornia, Andrea
, p. 5897 - 5905 (2013)
A new tetrairon(III) single-molecule magnet with enhanced volatility and processability was obtained by partial fluorination of the ancillary β-diketonato ligands. Fluorinated proligand Hpta = pivaloyltrifluoroacetone was used to assemble the bis(alkoxido
Scavenging Reaction of Solvated Electron Produced by UV Laser from Iodide Anion in Liquid Beam
Matsumura, Hisashi,Mafune, Fumitaka,Kondow, Tamotsu
, p. 5861 - 5864 (1995)
A sodium iodide (NaI) solution in ethanol was introduced into vacuum as a continuous liquid flow (liquid beam) and irradiated with a 220 nm UV laser.Cluster cations containing ethoxide such as Na+(NaOEt), Na+(NaI)n(NaOEt) (n = 1-4), and Na+(NaI)n(NaOEt)2 (n = 1-4) were observed by a time-of-flight (TOF) mass spectrometer.Furthermore, addition of NH4+ or n-BuOH into the NaI ethanol solution resulted in suppressing the intensities of the peaks associated with these cluster ions.It is concluded that the ethoxide is produced by a scavenging reaction of a solvated electron with an ethanol molecule, and the reaction of the ethoxide formation competes with a scavenging reaction by NH4+ or n-BuOH.The rate equations of these competing processes predict the dependence of the ethoxide formation on the concentration of NH4+ or n-BuOH.Similar reaction products were observed from alcohol solutions of several iodides.
Synthesis of new polysubstituted (pyrazoles, pyrimidines and quinolines) five and six-membered heterocycles: Reaction of α,α-dioxoketene dithioacetals with nucleophiles
Ebraheem,Lokanatha Rai,Kudva.n,Bahjat
, p. 3486 - 3492 (2010)
A novel synthesis of polysubstituted pyrazoles 3a-d, pyrimidines 4a-f and quinolines 5a-c via the reaction of α,α-oxoketene dithioacetals 2a-c with hydrazine hydrate, malonohydrazide, urea, thiourea and aniline is reported and the synthetic potential of the method is demonstrated. The structure of the new compounds was established upon their elemental analysis, IR, 1H NMR and 13C NMR.
Iron(ii) complexes of 2,6-di(1H-pyrazol-3-yl)-pyridine derivatives with hydrogen bonding and sterically bulky substituents
Roberts, Thomas D.,Little, Marc A.,Kershaw Cook, Laurence J.,Halcrow, Malcolm A.
, p. 7577 - 7588 (2014)
Syntheses of 2,6-di(5-aminopyrazol-3-yl)pyridine (L1), 2,6-di(5-tertbutylcarboxamidopyrazol-3-yl)pyridine (L2), 2,6-di(5-tertbutylpyrazol-3-yl)pyridine (L3), 2-(5-tertbutylpyrazol- 3-yl)-6-(5-methylpyrazol-3-yl)pyridine (L4) and 2-(5- tertbutylpyrazol-3-yl)-6-(5-aminopyrazol-3-yl)pyridine (L5) are reported. Iron complex salts of the first four ligands were crystallographically characterised. The structures exhibit intermolecular hydrogen bonding between the cations and the anions and/or solvent, leading to a fluorite (flu) net, a 1D ladder structure, and a homochiral self-penetrating helical network related to the (10,3)-a (srs) topology. All the complexes are high-spin in the crystal, and bulk samples are also fully or predominantly high-spin at room temperature and below although two of the dried materials exhibit partial spin-state transitions on cooling. This journal is the Partner Organisations 2014.
The AAAA?DDDD hydrogen bond dimer. Synthesis of a soluble sulfurane as AAAA domain and generation of a DDDD counterpart
Taubitz, Joerg,Luening, Ulrich
, p. 1550 - 1555 (2009)
Sulfurane 5b with solubility enhancing substituents has been synthesized to be used as an AAAA recognition site in quadruple hydrogen bond heterodimers. A complementary DDDD partner [4b + H+] has been generated from a DDAD domain 4b by protonation. The association constant for the heterodimer complex formation has been determined by NMR titration in chloroform. CSIRO 2009.
Crystal structure of sodium ethoxide (C2H5ONa), unravelled after 180 years
Beske, Maurice,Tapmeyer, Lukas,Schmidt, Martin U.
, p. 3520 - 3523 (2020)
As early as 1837, Liebig synthesised solid C2H5ONa. Today, C2H5ONa is one of the standard bases in organic synthesis. Here, we report the identification of different solid phases and the crystal structures and p
Substituent dependence on the spin crossover behaviour of mononuclear Fe(ii) complexes with asymmetric tridentate ligands
Saiki, Ryo,Miyamoto, Haruka,Shiga, Takuya,Oshio, Hiroki,Sagayama, Hajime,Kumai, Reiji,Newton, Graham N.
, p. 3231 - 3236 (2019)
Three mononuclear iron(ii) complexes of the formula [FeII(H2L1-3)2](BF4)2·x(solv.) (H2L1-3 = 2-[5-(R-phenyl)-1H-pyrazole-3-yl] 6-benzimidazole pyridine; H2L1: R = 4-methylphenyl, H2L2, R = 2,4,6-trimethylphenyl, H2L3, R = 2,3,4,5,6-pentamethylphenyl) (1, H2L1; 2, H2L2; 3, H2L3) with asymmetric tridentate ligands (H2L1-3) were synthesized and their structures and magnetic behaviour investigated. Significant structural distortions of the dihedral angles between phenyl and pyrazole groups were observed and found to depend on the nature of the substituent groups. Cryomagnetic studies reveal that 1 and 2 show gradual spin crossover behavior, while 3 remains in the high spin state between 1.8 and 300 K.
Catalyst system for producing polyethylene copolymers in a high temperature solution polymerization process
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, (2022/03/27)
Catalyst system for producing ethylene copolymers in a high temperature solution process, the catalyst system comprising: (i) a metallocene complex of formula (I) wherein M is Hf or a mixture with Zr, provided that more than 50% by moles of the complex of Formula I has M=Hf; X is a sigma ligand; R are the same or different from each other and can be saturated linear or branched C1-C10 alkyl, C6-C10 aryl, C4-C10 heteroaryl, C6-C20 alkylaryl or C6-C20 arylalkyl groups, which can optionally contain up to 2 heteroatoms or silicon atoms; R1 is a C6-C10 aryl or C6-C20 alkylaryl group optionally containing up to 2 heteroatoms or silicon atoms or a C4-C10 heteroaryl group; R2 is a C4-C20 cycloalkyl group, optionally carrying alkyl substituents in beta-positions, of formula (II) in which R′ can be the same or can be different from each other and can be hydrogen or is defined as R and n is 1 to 17; and (ii) a boron containing cocatalyst.