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关键词:'236071'
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236071

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P Jeslin Kanaga Inba et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 104, 300-309 (2013-01-01)
Salen [2,2'-{propane-1,3-diylbis[nitrilo(E)methylylidene]}bis(6-methoxyphenol)], reduced salen [(2,2'-[propane-1,3-diylbis(iminomethylene))]bis(6-methoxyphenol)] and N-alkylated salen [diethyl-2,2'-(propane-1,3-diylbis((2-hydroxy-3-methoxybenzyl) azanediyl))diacetate] compounds have been synthesized and characterized by IR, (1)H NMR, (13)C NMR and UV-vis. spectroscopy. Molecular geometry of the title compounds in the ground state has been optimized by density
Giuseppina Turturici et al.
Biochemistry, 57(30), 4391-4394 (2018-07-17)
The G-quadruplex (G4) is a four-stranded DNA structure identified in vivo in guanine-rich regions located in the promoter of a number of genes. Intriguing evidence suggested that small molecules acting as G4-targeting ligands could potentially regulate multiple cellular processes via
Weixu Feng et al.
Inorganic chemistry, 51(21), 11377-11386 (2012-10-10)
Unique homoleptic cyclic tetranuclear Ln(4)(Salen)(4) complexes [Ln(4)(L)(2)(HL)(2)(μ(3)-OH)(2)Cl(2)]·2Cl (Ln = Nd, 1; Ln = Yb, 2; Ln = Er, 3; Ln = Gd, 4) or Ln(4)(Salen)(2) complexes [Ln(4)(L)(2)(μ(3)-OH)(2)(OAc)(6)] (Ln = Nd, 5; Ln = Yb, 6; Ln = Er, 7; Ln
Linus Chiang et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 18(44), 14117-14127 (2012-09-22)
Square-planar nickel(II) complexes of salen ligands, N,N'-bis(3-tert-butyl-(5R)-salicylidene)-1,2-cyclohexanediamine), in which R=tert-butyl (1), OMe (2), and NMe(2) (3), were prepared and the electronic structure of the one-electron-oxidized species [1-3](+·) was investigated in solution. Cyclic voltammograms of [1-3] showed two quasi-reversible redox waves
F Janati Fard et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 97, 74-82 (2012-07-04)
Co(III) salen complex with N,N'-dipyridoxyl (1,4-butanediamine) Schiff-base ligand as tetradentate ligand was synthesized and characterized by the elemental and spectroscopic analysis. The interaction of this complex with calf thymus DNA (ct DNA) has been investigated in vitro using UV absorption
Russell C Pratt et al.
Journal of the American Chemical Society, 134(17), 7367-7377 (2012-04-05)
Nonsymmetric substitution of salen (1(R(1),R(2))) and reduced salen (2(R(1),R(2))) Cu(II)-phenoxyl complexes with a combination of -(t)Bu, -S(i)Pr, and -OMe substituents leads to dramatic differences in their redox and spectroscopic properties, providing insight into the influence of the cysteine-modified tyrosine cofactor
Lars P C Nielsen et al.
The Journal of organic chemistry, 77(5), 2486-2495 (2012-02-02)
The (salen)Co(III)-catalyzed hydrolytic kinetic resolution (HKR) of terminal epoxides is a bimetallic process with a rate controlled by partitioning between a nucleophilic (salen)Co-OH catalyst and a Lewis acidic (salen)Co-X catalyst. The commonly used (salen)Co-OAc and (salen)Co-Cl precatalysts undergo complete and
Ahmad Rohanifar et al.
Talanta, 188, 570-577 (2018-07-22)
A simple and sensitive method for simultaneous microextraction and determination of heavy metals using a new direct immersion solid-phase microextraction (DI-SPME) sorbent material combined with inductively coupled plasma mass spectrometry (ICP-MS) was investigated. In this method, sorbent coating composites were
Agisilaos Chantzis et al.
Journal of chemical theory and computation, 14(7), 3686-3702 (2018-06-13)
In this study, a detailed calibration of the performance of modern ab initio wave function methods in the domain of X-ray absorption spectroscopy (XAS) is presented. It has been known for some time that for a given level of approximation
Structure and Paramagnetism of Five-and Six-Co-ordinate N: N' Bis-salicylidene Ethylenediamine Iron (III) Chloride.
Gerloch M, et al.
Nature, 212, 809-810 (1966)
Kui Cheng et al.
Bioorganic & medicinal chemistry, 17(23), 7861-7871 (2009-11-04)
A series of peptide and Schiff bases (PSB) were synthesized by reacting salicylic acid, primary diamines with salicylaldehyde or its derivatives, and 40 of which were newly reported. The inhibitory activities against Escherichia coli beta-ketoacyl-acyl carrier protein synthase III (ecKAS
Bong Ho Koo et al.
Chemical communications (Cambridge, England), 48(19), 2519-2521 (2012-01-28)
A tetranuclear Er(III) compound chelated with N(2)O(2) donors of a tetradentate Schiff base was produced from the self-assembly of the corresponding chemical species. This intriguing cluster shows field-induced slow relaxation of magnetization.
Zdeněk Dvořák et al.
Toxicology in vitro : an international journal published in association with BIBRA, 26(3), 480-484 (2012-01-26)
The 1d-polymeric iron(III) complexes [Fe(salen)(μ-L)](n) (1-6), involving a deprotonated form of the N-donor heterocyclic compounds (L) imidazole (complex 1), 1,2,4-triazole (2), benztriazole (3), 5-methyltetrazole (4), 5-aminotetrazole (5) and 5-phenyltetrazole (6), were studied for their in vitro cytotoxic activity against human
Katarzyna Witt et al.
Membranes, 10(4) (2020-04-08)
In this paper, three main methods of metal ion separation, i.e., liquid-liquid extraction, transport across polymer inclusion membranes (PIMs), and sorption/desorption, are described. In all of them, N,N'-bis(salicylidene)ethylenediamine (salen) was used as an active compound, i.e., as an extractant or
Clare Bakewell et al.
Journal of the American Chemical Society, 134(51), 20577-20580 (2012-12-13)
Highly active yttrium phosphasalen initiators for the stereocontrolled ring-opening polymerization of rac-lactide are reported. The initiators are coordinated by a new class of ancillary ligand: an iminophosphorane derivative of the popular "salen" ligand, termed "phosphasalen". Changing the phosphasalen structure enables
Takuya Kurahashi et al.
Inorganic chemistry, 52(7), 3908-3919 (2013-03-23)
The Co(salen)(X) complex, where salen is chiral N,N'-bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediamine and X is an external axial ligand, has been widely utilized as a versatile catalyst. The Co(salen)(X) complex is a stable solid that has been conventionally described as a Co(III)(salen)(X) complex. Recent
Hydration of epoxides on [CoIII salen)] encapsulated in silica-based nanoreactors.
Bo Li et al.
Angewandte Chemie (International ed. in English), 51(46), 11517-11521 (2012-10-16)
Carlos Diaz et al.
The journal of physical chemistry. A, 116(10), 2453-2465 (2012-02-15)
A novel axially chiral binaphthyl fluorene based salen ligand, AFX-155 [2,2'-(1E,1'E)-(R)-1,1'-binaphthyl-2,2'-diylbis(azan-1-yl-1-ylidene)bis(methan-1-yl-1-ylidene)bis(4-((7-(diphenylamino)-9,9-dihexyl-9H-fluoren-2-l)ethynyl)phenol)], with potential applications in homogeneous catalysis, biophotonics, and sensing was synthesized. A full comparative theoretical-experimental analysis of the UV-vis and electronic circular dichroism (ECD) spectra of the 10 primary
Seifollah Bahramikia et al.
Chemical biology & drug design, 80(2), 227-236 (2012-04-26)
Accumulation of intra- and/or extracellular misfolded proteins as amyloid fibrils is a key hallmark in more than 20 amyloid-related diseases. In that respect, blocking or reversing amyloid aggregation via the use of small compounds is considered as two useful approaches
Lakshmi Kanta Das et al.
Dalton transactions (Cambridge, England : 2003), 41(36), 11009-11017 (2012-08-04)
Two new trinuclear hetero-metallic copper(II)-zinc(II) complexes [(CuL)(2)Zn(N(3))(2)] (1A and 1B) have been synthesized using [CuL] as a so-called "metalloligand" (where H(2)L = N,N'-bis(salicylidene)-1,3-propanediamine) and structurally characterized. Complexes 1A and 1B have the same molecular formula but crystallize in different crystal
Erin E Podlesny et al.
Organic letters, 14(18), 4862-4865 (2012-09-04)
The selective oxidation of a series of functionalized 8,8'-hydroxylated binaphthols to binaphtho-para- and binaphtho-ortho-quinones has been realized using either a Co-salen catalyst or ortho-iodoxybenzoic acid. A unique spirocyclic bis-spironaphthalenone was also obtained in good yield via a phenyliodonium diacetate promoted
Mohammad Azam et al.
Dalton transactions (Cambridge, England : 2003), 41(35), 10854-10864 (2012-08-04)
We have reported the synthesis of a novel salen ligand and its mononuclear Pd-salen complexes derived from 2-{[2-hydroxy-3-{[(E)-(2-hydroxyphenyl)methylidene]amino}propyl)imino]methyl}phenol. The newly synthesized and isolated Pd(II) complexes have been identified and fully characterized by various physico-chemical studies viz., elemental analyses, IR, UV-Vis
Andrea Pappalardo et al.
The Journal of organic chemistry, 77(17), 7684-7687 (2012-08-16)
A pair of diastereomeric salen cavitands and their uranyl complexes combine a chiral (R,R) salen bridge and an inherent chiral tris-bridged quinoxaline cup within the same molecule. Whereas the free ligands show a preference for the same enantiomer of an
Amélie Kochem et al.
Inorganic chemistry, 51(20), 10557-10571 (2012-09-28)
Square planar cobalt(II) complexes of salen ligands N,N'-bis(3-tert-butyl-5R-salicylidene)-1,2-cyclohexanediamine), where R = OMe (1) and tert-butyl (2), were prepared. 1 and 2 were electrochemically reversibly oxidized into cations [1-H(2)O](+) and [2-H(2)O](+) in CH(2)Cl(2). The chemically generated [1-H(2)O](SbF(6))·0.68 H(2)O·0.82CH(2)Cl(2) and [2-H(2)O](SbF(6))·0.3H(2)O·0.85CH(2)Cl(2) were
David J Burns et al.
Organic & biomolecular chemistry, 10(38), 7666-7668 (2012-08-30)
Due to the lack of availability of unnatural (+)-quinic acid as a starting material, a 6-step synthesis of butane diacetal-protected (4S,5S)-dihydroxycyclohexen-1-one (formally derived from (+)-quinic acid) has been devised. The key catalytic asymmetric step involves a chiral Co-salen-catalysed epoxide ring-opening
Teng Zhang et al.
Chemical communications (Cambridge, England), 48(70), 8766-8768 (2012-07-28)
Chiral metal-organic frameworks built from a Co-salen derived dicarboxylate bridging ligand exhibited different regioselectivities from the corresponding homogeneous catalyst by shutting down bimolecular activation pathways.
Veli T Kasumov et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 104, 203-212 (2012-12-26)
New salen type ligands, N,N'-bis(X-3-tert-butylsalicylidene)-4,4'-ethylenedianiline [(X=H (1), 5-tert-butyl (2)] and N,N'-bis(X-3-tert-butylsalicylidene)-4,4'-amidedianiline [X=H (3), 5-tert (4)] and their copper(II) complexes 5-8, have been synthesized. Their spectroscopic (IR, (1)H NMR, UV/vis, ESR) properties, as well as magnetic and redox-reactivity behavior are reported.
Manish Kumar et al.
The Journal of organic chemistry, 78(18), 9076-9084 (2013-08-01)
Chiral polymeric Co(III) salen complexes with chiral ((R)/(S)-BINOL, diethyl tartrate) and achiral (piperazine and trigol) linkers with varying stereogenic centers were synthesized for the first time and used as catalysts for aminolytic kinetic resolution (AKR) of a variety of terminal
Immobilized salen (N,N'-bis (salicylidene) ethylenediamine) as a complexing agent for on-line sorbent extraction/preconcentration and flow injection-flame atomic absorption spectrometry.
Dadfarnia S, et al.
Analytica Chimica Acta, 539(1), 69-75 (2005)
Paulo A Raymundo-Pereira et al.
Materials science & engineering. C, Materials for biological applications, 33(7), 4081-4085 (2013-08-06)
The preparation and electrochemical characterization of a carbon paste electrode modified with the N,N-ethylene-bis(salicyllideneiminato)oxovanadium (IV) complex ([VO(salen)]) as well as its application for ranitidine determination are described. The electrochemical behavior of the modified electrode for the electroreduction of ranitidine was
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