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.
Synthesis and characterization of new 5,5′-dimethyl- and 5,5′-diphenylhydantoin-conjugated hemorphin derivatives designed as potential anticonvulsant agents
Georgieva, Stela,Peneva, Petia,Rangelov, Miroslav,Tchekalarova, Jana,Todorov, Petar,Todorova, Nadezhda
, p. 2198 - 2217 (2022/02/16)
Herein, the synthesis and characterization of some novel N-modified hybrid analogues of hemorphins containing a C-5 substituted hydantoin residue as potential anticonvulsants and for the blockade of sodium channels are presented. Their structure-property relationships are highlighted by electrochemical and Fourier transform infrared spectroscopy (FT-IR) analysis methods. The lipophilicity and molecular docking of voltage-gated sodium channels were also determined. The new series of 5,5′-dimethyl- and 5,5′-diphenylhydantoin-conjugated hemorphin derivatives were obtained as C-terminal amides via solid-phase peptide synthesis, an Fmoc-strategy using 2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethylaminium tetrafluoroborate (TBTU). The anticonvulsant activity of the hybrid-peptides (0.25, 0.5 and 1 μg) was tested by maximal electroshock (MES) and 6 Hz psychomotor seizure tests using male ICR mice. None of the compounds tested showed neurotoxicity in the rotarod test. The reference drug phenytoin was used as a positive control. The most active compound Ph-5 showed 100% efficacy against the 6 Hz-induced psychomotor seizures at a dose of 1.0 μg and tonic seizures in the MES test at a lower dose of 0.5 μg. This analogue of VV-hemorphin-5 contained a 5,5′-diphenylhydantoin residue at the N-terminus and a hydrophobic Val-Val-Tyr-Pro-Trp-Thr-Gln-CONH2 amino acid sequence of the peptide molecule. The quantitative data for the 6 Hz test demonstrated that the peptide Ph-5 exhibited a median effective dose (ED50) value of 0.358 μg and PI >13.97, and ED50 of 0.25 μg and PI >20.35 in the MES test, respectively. Results from the docking study suggest that the neuropeptide Ph-5 is a potent inhibitor of sodium channels, and blockade of voltage-gated sodium channels could be the mechanism of action of the hybrid-peptide derivatives with anticonvulsant activity.
